diff --git a/Source/Core/DiscIO/Blob.h b/Source/Core/DiscIO/Blob.h
index 52b083ab63..1d23d7b6b0 100644
--- a/Source/Core/DiscIO/Blob.h
+++ b/Source/Core/DiscIO/Blob.h
@@ -41,11 +41,16 @@ class BlobReader
 {
 public:
   virtual ~BlobReader() {}
+
   virtual BlobType GetBlobType() const = 0;
+
   virtual u64 GetRawSize() const = 0;
   virtual u64 GetDataSize() const = 0;
   virtual bool IsDataSizeAccurate() const = 0;
 
+  // Returns 0 if the format does not use blocks
+  virtual u64 GetBlockSize() const { return 0; }
+
   // NOT thread-safe - can't call this from multiple threads.
   virtual bool Read(u64 offset, u64 size, u8* out_ptr) = 0;
   template <typename T>
@@ -160,10 +165,11 @@ std::unique_ptr<BlobReader> CreateBlobReader(const std::string& filename);
 
 typedef bool (*CompressCB)(const std::string& text, float percent, void* arg);
 
-bool CompressFileToBlob(const std::string& infile_path, const std::string& outfile_path,
-                        u32 sub_type = 0, int sector_size = 16384, CompressCB callback = nullptr,
-                        void* arg = nullptr);
-bool DecompressBlobToFile(const std::string& infile_path, const std::string& outfile_path,
-                          CompressCB callback = nullptr, void* arg = nullptr);
+bool ConvertToGCZ(BlobReader* infile, const std::string& infile_path,
+                  const std::string& outfile_path, u32 sub_type, int sector_size = 16384,
+                  CompressCB callback = nullptr, void* arg = nullptr);
+bool ConvertToPlain(BlobReader* infile, const std::string& infile_path,
+                    const std::string& outfile_path, CompressCB callback = nullptr,
+                    void* arg = nullptr);
 
 }  // namespace DiscIO
diff --git a/Source/Core/DiscIO/CISOBlob.h b/Source/Core/DiscIO/CISOBlob.h
index dc606bb4a5..66f950f074 100644
--- a/Source/Core/DiscIO/CISOBlob.h
+++ b/Source/Core/DiscIO/CISOBlob.h
@@ -37,12 +37,15 @@ public:
   static std::unique_ptr<CISOFileReader> Create(File::IOFile file);
 
   BlobType GetBlobType() const override { return BlobType::CISO; }
+
+  u64 GetRawSize() const override;
   // The CISO format does not save the original file size.
   // This function returns an upper bound.
   u64 GetDataSize() const override;
   bool IsDataSizeAccurate() const override { return false; }
 
-  u64 GetRawSize() const override;
+  u64 GetBlockSize() const override { return m_block_size; }
+
   bool Read(u64 offset, u64 nbytes, u8* out_ptr) override;
 
 private:
diff --git a/Source/Core/DiscIO/CMakeLists.txt b/Source/Core/DiscIO/CMakeLists.txt
index 279e72030d..4970f135c2 100644
--- a/Source/Core/DiscIO/CMakeLists.txt
+++ b/Source/Core/DiscIO/CMakeLists.txt
@@ -23,6 +23,8 @@ add_library(discio
   Filesystem.h
   NANDImporter.cpp
   NANDImporter.h
+  ScrubbedBlob.cpp
+  ScrubbedBlob.h
   TGCBlob.cpp
   TGCBlob.h
   Volume.cpp
diff --git a/Source/Core/DiscIO/CompressedBlob.cpp b/Source/Core/DiscIO/CompressedBlob.cpp
index 5248170683..cda3cad6d3 100644
--- a/Source/Core/DiscIO/CompressedBlob.cpp
+++ b/Source/Core/DiscIO/CompressedBlob.cpp
@@ -17,6 +17,7 @@
 #include <vector>
 #include <zlib.h>
 
+#include "Common/Assert.h"
 #include "Common/CommonTypes.h"
 #include "Common/File.h"
 #include "Common/FileUtil.h"
@@ -153,23 +154,11 @@ bool CompressedBlobReader::GetBlock(u64 block_num, u8* out_ptr)
   return true;
 }
 
-bool CompressFileToBlob(const std::string& infile_path, const std::string& outfile_path,
-                        u32 sub_type, int block_size, CompressCB callback, void* arg)
+bool ConvertToGCZ(BlobReader* infile, const std::string& infile_path,
+                  const std::string& outfile_path, u32 sub_type, int block_size,
+                  CompressCB callback, void* arg)
 {
-  bool scrubbing = false;
-
-  File::IOFile infile(infile_path, "rb");
-  if (IsGCZBlob(infile))
-  {
-    PanicAlertT("\"%s\" is already compressed! Cannot compress it further.", infile_path.c_str());
-    return false;
-  }
-
-  if (!infile)
-  {
-    PanicAlertT("Failed to open the input file \"%s\".", infile_path.c_str());
-    return false;
-  }
+  ASSERT(infile->IsDataSizeAccurate());
 
   File::IOFile outfile(outfile_path, "wb");
   if (!outfile)
@@ -181,21 +170,6 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
     return false;
   }
 
-  DiscScrubber disc_scrubber;
-  std::unique_ptr<VolumeDisc> volume;
-  if (sub_type == 1)
-  {
-    volume = CreateDisc(infile_path);
-    if (!volume || !disc_scrubber.SetupScrub(volume.get(), block_size))
-    {
-      PanicAlertT("\"%s\" failed to be scrubbed. Probably the image is corrupt.",
-                  infile_path.c_str());
-      return false;
-    }
-
-    scrubbing = true;
-  }
-
   z_stream z = {};
   if (deflateInit(&z, 9) != Z_OK)
     return false;
@@ -206,7 +180,7 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
   header.magic_cookie = GCZ_MAGIC;
   header.sub_type = sub_type;
   header.block_size = block_size;
-  header.data_size = infile.GetSize();
+  header.data_size = infile->GetDataSize();
 
   // round upwards!
   header.num_blocks = (u32)((header.data_size + (block_size - 1)) / block_size);
@@ -220,10 +194,9 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
   outfile.Seek(sizeof(CompressedBlobHeader), SEEK_CUR);
   // seek past the offset and hash tables (we will write them at the end)
   outfile.Seek((sizeof(u64) + sizeof(u32)) * header.num_blocks, SEEK_CUR);
-  // seek to the start of the input file to make sure we get everything
-  infile.Seek(0, SEEK_SET);
 
   // Now we are ready to write compressed data!
+  u64 inpos = 0;
   u64 position = 0;
   int num_compressed = 0;
   int num_stored = 0;
@@ -234,7 +207,6 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
   {
     if (i % progress_monitor == 0)
     {
-      const u64 inpos = infile.Tell();
       int ratio = 0;
       if (inpos != 0)
         ratio = (int)(100 * position / inpos);
@@ -252,13 +224,16 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
 
     offsets[i] = position;
 
-    size_t read_bytes;
-    if (scrubbing)
-      read_bytes = disc_scrubber.GetNextBlock(infile, in_buf.data());
-    else
-      infile.ReadArray(in_buf.data(), header.block_size, &read_bytes);
-    if (read_bytes < header.block_size)
-      std::fill(in_buf.begin() + read_bytes, in_buf.begin() + header.block_size, 0);
+    const u64 bytes_to_read = std::min<u64>(block_size, header.data_size - inpos);
+
+    success = infile->Read(inpos, bytes_to_read, in_buf.data());
+    if (!success)
+    {
+      PanicAlertT("Failed to read from the input file \"%s\".", infile_path.c_str());
+      break;
+    }
+
+    std::fill(in_buf.begin() + bytes_to_read, in_buf.begin() + header.block_size, 0);
 
     int retval = deflateReset(&z);
     z.next_in = in_buf.data();
@@ -305,6 +280,7 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
       break;
     }
 
+    inpos += block_size;
     position += write_size;
 
     hashes[i] = Common::HashAdler32(write_buf, write_size);
@@ -337,84 +313,6 @@ bool CompressFileToBlob(const std::string& infile_path, const std::string& outfi
   return success;
 }
 
-bool DecompressBlobToFile(const std::string& infile_path, const std::string& outfile_path,
-                          CompressCB callback, void* arg)
-{
-  std::unique_ptr<CompressedBlobReader> reader;
-  {
-    File::IOFile infile(infile_path, "rb");
-    if (!IsGCZBlob(infile))
-    {
-      PanicAlertT("File not compressed");
-      return false;
-    }
-
-    reader = CompressedBlobReader::Create(std::move(infile), infile_path);
-  }
-
-  if (!reader)
-  {
-    PanicAlertT("Failed to open the input file \"%s\".", infile_path.c_str());
-    return false;
-  }
-
-  File::IOFile outfile(outfile_path, "wb");
-  if (!outfile)
-  {
-    PanicAlertT("Failed to open the output file \"%s\".\n"
-                "Check that you have permissions to write the target folder and that the media can "
-                "be written.",
-                outfile_path.c_str());
-    return false;
-  }
-
-  const CompressedBlobHeader& header = reader->GetHeader();
-  static const size_t BUFFER_BLOCKS = 32;
-  size_t buffer_size = header.block_size * BUFFER_BLOCKS;
-  std::vector<u8> buffer(buffer_size);
-  u32 num_buffers = (header.num_blocks + BUFFER_BLOCKS - 1) / BUFFER_BLOCKS;
-  int progress_monitor = std::max<int>(1, num_buffers / 100);
-  bool success = true;
-
-  for (u64 i = 0; i < num_buffers; i++)
-  {
-    if (i % progress_monitor == 0)
-    {
-      const bool was_cancelled =
-          !callback(Common::GetStringT("Unpacking"), (float)i / (float)num_buffers, arg);
-      if (was_cancelled)
-      {
-        success = false;
-        break;
-      }
-    }
-    const u64 inpos = i * buffer_size;
-    const u64 sz = std::min<u64>(buffer_size, header.data_size - inpos);
-    reader->Read(inpos, sz, buffer.data());
-    if (!outfile.WriteBytes(buffer.data(), sz))
-    {
-      PanicAlertT("Failed to write the output file \"%s\".\n"
-                  "Check that you have enough space available on the target drive.",
-                  outfile_path.c_str());
-      success = false;
-      break;
-    }
-  }
-
-  if (!success)
-  {
-    // Remove the incomplete output file.
-    outfile.Close();
-    File::Delete(outfile_path);
-  }
-  else
-  {
-    outfile.Resize(header.data_size);
-  }
-
-  return success;
-}
-
 bool IsGCZBlob(File::IOFile& file)
 {
   const u64 position = file.Tell();
diff --git a/Source/Core/DiscIO/CompressedBlob.h b/Source/Core/DiscIO/CompressedBlob.h
index 0e290542c6..8c63aa68d6 100644
--- a/Source/Core/DiscIO/CompressedBlob.h
+++ b/Source/Core/DiscIO/CompressedBlob.h
@@ -52,6 +52,7 @@ public:
   u64 GetRawSize() const override { return m_file_size; }
   u64 GetDataSize() const override { return m_header.data_size; }
   bool IsDataSizeAccurate() const override { return true; }
+  u64 GetBlockSize() const override { return m_header.block_size; }
   u64 GetBlockCompressedSize(u64 block_num) const;
   bool GetBlock(u64 block_num, u8* out_ptr) override;
 
diff --git a/Source/Core/DiscIO/DiscIO.vcxproj b/Source/Core/DiscIO/DiscIO.vcxproj
index dd322dbb62..98bb500452 100644
--- a/Source/Core/DiscIO/DiscIO.vcxproj
+++ b/Source/Core/DiscIO/DiscIO.vcxproj
@@ -56,6 +56,7 @@
     <ClCompile Include="Filesystem.cpp" />
     <ClCompile Include="FileSystemGCWii.cpp" />
     <ClCompile Include="NANDImporter.cpp" />
+    <ClCompile Include="ScrubbedBlob.cpp" />
     <ClCompile Include="TGCBlob.cpp" />
     <ClCompile Include="Volume.cpp" />
     <ClCompile Include="VolumeFileBlobReader.cpp" />
@@ -80,6 +81,7 @@
     <ClInclude Include="Filesystem.h" />
     <ClInclude Include="FileSystemGCWii.h" />
     <ClInclude Include="NANDImporter.h" />
+    <ClInclude Include="ScrubbedBlob.h" />
     <ClInclude Include="TGCBlob.h" />
     <ClInclude Include="Volume.h" />
     <ClInclude Include="VolumeFileBlobReader.h" />
diff --git a/Source/Core/DiscIO/DiscIO.vcxproj.filters b/Source/Core/DiscIO/DiscIO.vcxproj.filters
index 5fb5891cfe..9b19fa8471 100644
--- a/Source/Core/DiscIO/DiscIO.vcxproj.filters
+++ b/Source/Core/DiscIO/DiscIO.vcxproj.filters
@@ -87,6 +87,9 @@
     <ClCompile Include="WiiEncryptionCache.cpp">
       <Filter>Volume\Blob</Filter>
     </ClCompile>
+    <ClCompile Include="ScrubbedBlob.cpp">
+      <Filter>Volume\Blob</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="DiscScrubber.h">
@@ -155,6 +158,9 @@
     <ClInclude Include="WiiEncryptionCache.h">
       <Filter>Volume\Blob</Filter>
     </ClInclude>
+    <ClInclude Include="ScrubbedBlob.h">
+      <Filter>Volume\Blob</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Text Include="CMakeLists.txt" />
diff --git a/Source/Core/DiscIO/DiscScrubber.cpp b/Source/Core/DiscIO/DiscScrubber.cpp
index 8a06d9266e..e7b098b374 100644
--- a/Source/Core/DiscIO/DiscScrubber.cpp
+++ b/Source/Core/DiscIO/DiscScrubber.cpp
@@ -14,6 +14,7 @@
 #include <vector>
 
 #include "Common/Align.h"
+#include "Common/Assert.h"
 #include "Common/CommonTypes.h"
 #include "Common/File.h"
 #include "Common/Logging/Log.h"
@@ -24,24 +25,14 @@
 
 namespace DiscIO
 {
-constexpr size_t CLUSTER_SIZE = 0x8000;
-
 DiscScrubber::DiscScrubber() = default;
 DiscScrubber::~DiscScrubber() = default;
 
-bool DiscScrubber::SetupScrub(const Volume* disc, int block_size)
+bool DiscScrubber::SetupScrub(const Volume* disc)
 {
   if (!disc)
     return false;
   m_disc = disc;
-  m_block_size = block_size;
-
-  if (CLUSTER_SIZE % m_block_size != 0)
-  {
-    ERROR_LOG(DISCIO, "Block size %u is not a factor of 0x8000, scrubbing not possible",
-              m_block_size);
-    return false;
-  }
 
   m_file_size = m_disc->GetSize();
 
@@ -54,34 +45,10 @@ bool DiscScrubber::SetupScrub(const Volume* disc, int block_size)
   // Fill out table of free blocks
   const bool success = ParseDisc();
 
-  m_block_count = 0;
-
   m_is_scrubbing = success;
   return success;
 }
 
-size_t DiscScrubber::GetNextBlock(File::IOFile& in, u8* buffer)
-{
-  const u64 current_offset = m_block_count * m_block_size;
-
-  size_t read_bytes = 0;
-  if (CanBlockBeScrubbed(current_offset))
-  {
-    DEBUG_LOG(DISCIO, "Freeing 0x%016" PRIx64, current_offset);
-    std::fill(buffer, buffer + m_block_size, 0x00);
-    in.Seek(m_block_size, SEEK_CUR);
-    read_bytes = m_block_size;
-  }
-  else
-  {
-    DEBUG_LOG(DISCIO, "Used    0x%016" PRIx64, current_offset);
-    in.ReadArray(buffer, m_block_size, &read_bytes);
-  }
-
-  m_block_count++;
-  return read_bytes;
-}
-
 bool DiscScrubber::CanBlockBeScrubbed(u64 offset) const
 {
   return m_is_scrubbing && m_free_table[offset / CLUSTER_SIZE];
@@ -89,8 +56,8 @@ bool DiscScrubber::CanBlockBeScrubbed(u64 offset) const
 
 void DiscScrubber::MarkAsUsed(u64 offset, u64 size)
 {
-  u64 current_offset = offset;
-  const u64 end_offset = current_offset + size;
+  u64 current_offset = Common::AlignDown(offset, CLUSTER_SIZE);
+  const u64 end_offset = offset + size;
 
   DEBUG_LOG(DISCIO, "Marking 0x%016" PRIx64 " - 0x%016" PRIx64 " as used", offset, end_offset);
 
@@ -103,20 +70,27 @@ void DiscScrubber::MarkAsUsed(u64 offset, u64 size)
 
 void DiscScrubber::MarkAsUsedE(u64 partition_data_offset, u64 offset, u64 size)
 {
-  u64 first_cluster_start = ToClusterOffset(offset) + partition_data_offset;
-
-  u64 last_cluster_end;
-  if (size == 0)
+  if (partition_data_offset == 0)
   {
-    // Without this special case, a size of 0 can be rounded to 1 cluster instead of 0
-    last_cluster_end = first_cluster_start;
+    MarkAsUsed(offset, size);
   }
   else
   {
-    last_cluster_end = ToClusterOffset(offset + size - 1) + CLUSTER_SIZE + partition_data_offset;
-  }
+    u64 first_cluster_start = ToClusterOffset(offset) + partition_data_offset;
 
-  MarkAsUsed(first_cluster_start, last_cluster_end - first_cluster_start);
+    u64 last_cluster_end;
+    if (size == 0)
+    {
+      // Without this special case, a size of 0 can be rounded to 1 cluster instead of 0
+      last_cluster_end = first_cluster_start;
+    }
+    else
+    {
+      last_cluster_end = ToClusterOffset(offset + size - 1) + CLUSTER_SIZE + partition_data_offset;
+    }
+
+    MarkAsUsed(first_cluster_start, last_cluster_end - first_cluster_start);
+  }
 }
 
 // Compensate for 0x400 (SHA-1) per 0x8000 (cluster), and round to whole clusters
@@ -147,35 +121,38 @@ bool DiscScrubber::ReadFromVolume(u64 offset, u64& buffer, const Partition& part
 
 bool DiscScrubber::ParseDisc()
 {
+  if (m_disc->GetPartitions().empty())
+    return ParsePartitionData(PARTITION_NONE);
+
   // Mark the header as used - it's mostly 0s anyways
   MarkAsUsed(0, 0x50000);
 
   for (const DiscIO::Partition& partition : m_disc->GetPartitions())
   {
-    PartitionHeader header;
+    u32 tmd_size;
+    u64 tmd_offset;
+    u32 cert_chain_size;
+    u64 cert_chain_offset;
+    u64 h3_offset;
+    // The H3 size is always 0x18000
 
-    if (!ReadFromVolume(partition.offset + 0x2a4, header.tmd_size, PARTITION_NONE) ||
-        !ReadFromVolume(partition.offset + 0x2a8, header.tmd_offset, PARTITION_NONE) ||
-        !ReadFromVolume(partition.offset + 0x2ac, header.cert_chain_size, PARTITION_NONE) ||
-        !ReadFromVolume(partition.offset + 0x2b0, header.cert_chain_offset, PARTITION_NONE) ||
-        !ReadFromVolume(partition.offset + 0x2b4, header.h3_offset, PARTITION_NONE) ||
-        !ReadFromVolume(partition.offset + 0x2b8, header.data_offset, PARTITION_NONE) ||
-        !ReadFromVolume(partition.offset + 0x2bc, header.data_size, PARTITION_NONE))
+    if (!ReadFromVolume(partition.offset + 0x2a4, tmd_size, PARTITION_NONE) ||
+        !ReadFromVolume(partition.offset + 0x2a8, tmd_offset, PARTITION_NONE) ||
+        !ReadFromVolume(partition.offset + 0x2ac, cert_chain_size, PARTITION_NONE) ||
+        !ReadFromVolume(partition.offset + 0x2b0, cert_chain_offset, PARTITION_NONE) ||
+        !ReadFromVolume(partition.offset + 0x2b4, h3_offset, PARTITION_NONE))
     {
       return false;
     }
 
     MarkAsUsed(partition.offset, 0x2c0);
 
-    MarkAsUsed(partition.offset + header.tmd_offset, header.tmd_size);
-    MarkAsUsed(partition.offset + header.cert_chain_offset, header.cert_chain_size);
-    MarkAsUsed(partition.offset + header.h3_offset, 0x18000);
-    // This would mark the whole (encrypted) data area
-    // we need to parse FST and other crap to find what's free within it!
-    // MarkAsUsed(partition.offset + header.data_offset, header.data_size);
+    MarkAsUsed(partition.offset + tmd_offset, tmd_size);
+    MarkAsUsed(partition.offset + cert_chain_offset, cert_chain_size);
+    MarkAsUsed(partition.offset + h3_offset, 0x18000);
 
     // Parse Data! This is where the big gain is
-    if (!ParsePartitionData(partition, &header))
+    if (!ParsePartitionData(partition))
       return false;
   }
 
@@ -183,7 +160,7 @@ bool DiscScrubber::ParseDisc()
 }
 
 // Operations dealing with encrypted space are done here
-bool DiscScrubber::ParsePartitionData(const Partition& partition, PartitionHeader* header)
+bool DiscScrubber::ParsePartitionData(const Partition& partition)
 {
   const FileSystem* filesystem = m_disc->GetFileSystem(partition);
   if (!filesystem)
@@ -193,17 +170,30 @@ bool DiscScrubber::ParsePartitionData(const Partition& partition, PartitionHeade
     return false;
   }
 
-  const u64 partition_data_offset = partition.offset + header->data_offset;
+  u64 partition_data_offset;
+  if (partition == PARTITION_NONE)
+  {
+    partition_data_offset = 0;
+  }
+  else
+  {
+    u64 data_offset;
+    if (!ReadFromVolume(partition.offset + 0x2b8, data_offset, PARTITION_NONE))
+      return false;
+
+    partition_data_offset = partition.offset + data_offset;
+  }
 
   // Mark things as used which are not in the filesystem
   // Header, Header Information, Apploader
-  if (!ReadFromVolume(0x2440 + 0x14, header->apploader_size, partition) ||
-      !ReadFromVolume(0x2440 + 0x18, header->apploader_size, partition))
+  u32 apploader_size;
+  u32 apploader_trailer_size;
+  if (!ReadFromVolume(0x2440 + 0x14, apploader_size, partition) ||
+      !ReadFromVolume(0x2440 + 0x18, apploader_trailer_size, partition))
   {
     return false;
   }
-  MarkAsUsedE(partition_data_offset, 0,
-              0x2440 + header->apploader_size + header->apploader_trailer_size);
+  MarkAsUsedE(partition_data_offset, 0, 0x2440 + apploader_size + apploader_trailer_size);
 
   // DOL
   const std::optional<u64> dol_offset = GetBootDOLOffset(*m_disc, partition);
@@ -212,17 +202,14 @@ bool DiscScrubber::ParsePartitionData(const Partition& partition, PartitionHeade
   const std::optional<u64> dol_size = GetBootDOLSize(*m_disc, partition, *dol_offset);
   if (!dol_size)
     return false;
-  header->dol_offset = *dol_offset;
-  header->dol_size = *dol_size;
-  MarkAsUsedE(partition_data_offset, header->dol_offset, header->dol_size);
+  MarkAsUsedE(partition_data_offset, *dol_offset, *dol_size);
 
   // FST
-  if (!ReadFromVolume(0x424, header->fst_offset, partition) ||
-      !ReadFromVolume(0x428, header->fst_size, partition))
-  {
+  const std::optional<u64> fst_offset = GetFSTOffset(*m_disc, partition);
+  const std::optional<u64> fst_size = GetFSTSize(*m_disc, partition);
+  if (!fst_offset || !fst_size)
     return false;
-  }
-  MarkAsUsedE(partition_data_offset, header->fst_offset, header->fst_size);
+  MarkAsUsedE(partition_data_offset, *fst_offset, *fst_size);
 
   // Go through the filesystem and mark entries as used
   ParseFileSystemData(partition_data_offset, filesystem->GetRoot());
diff --git a/Source/Core/DiscIO/DiscScrubber.h b/Source/Core/DiscIO/DiscScrubber.h
index 15e0cda7f7..5d64fa5376 100644
--- a/Source/Core/DiscIO/DiscScrubber.h
+++ b/Source/Core/DiscIO/DiscScrubber.h
@@ -2,11 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
-// DiscScrubber removes the garbage data from discs (currently Wii only) which
-// is on the disc due to encryption
-
-// It could be adapted to GameCube discs, but the gain is most likely negligible,
-// and having 1:1 backups of discs is always nice when they are reasonably sized
+// DiscScrubber removes the pseudorandom padding data from discs
 
 // Note: the technique is inspired by Wiiscrubber, but much simpler - intentionally :)
 
@@ -34,46 +30,27 @@ public:
   DiscScrubber();
   ~DiscScrubber();
 
-  bool SetupScrub(const Volume* disc, int block_size);
-  size_t GetNextBlock(File::IOFile& in, u8* buffer);
+  bool SetupScrub(const Volume* disc);
+
+  // Returns true if the specified 32 KiB block only contains unused data
   bool CanBlockBeScrubbed(u64 offset) const;
 
-private:
-  struct PartitionHeader final
-  {
-    u8* ticket[0x2a4];
-    u32 tmd_size;
-    u64 tmd_offset;
-    u32 cert_chain_size;
-    u64 cert_chain_offset;
-    // H3Size is always 0x18000
-    u64 h3_offset;
-    u64 data_offset;
-    u64 data_size;
-    // TMD would be here
-    u64 dol_offset;
-    u64 dol_size;
-    u64 fst_offset;
-    u64 fst_size;
-    u32 apploader_size;
-    u32 apploader_trailer_size;
-  };
+  static constexpr size_t CLUSTER_SIZE = 0x8000;
 
+private:
   void MarkAsUsed(u64 offset, u64 size);
   void MarkAsUsedE(u64 partition_data_offset, u64 offset, u64 size);
   u64 ToClusterOffset(u64 offset) const;
   bool ReadFromVolume(u64 offset, u32& buffer, const Partition& partition);
   bool ReadFromVolume(u64 offset, u64& buffer, const Partition& partition);
   bool ParseDisc();
-  bool ParsePartitionData(const Partition& partition, PartitionHeader* header);
+  bool ParsePartitionData(const Partition& partition);
   void ParseFileSystemData(u64 partition_data_offset, const FileInfo& directory);
 
   const Volume* m_disc;
 
   std::vector<u8> m_free_table;
   u64 m_file_size = 0;
-  u64 m_block_count = 0;
-  u32 m_block_size = 0;
   bool m_is_scrubbing = false;
 };
 
diff --git a/Source/Core/DiscIO/DriveBlob.h b/Source/Core/DiscIO/DriveBlob.h
index fddfbee7a2..46c141b1d3 100644
--- a/Source/Core/DiscIO/DriveBlob.h
+++ b/Source/Core/DiscIO/DriveBlob.h
@@ -23,11 +23,15 @@ class DriveReader : public SectorReader
 public:
   static std::unique_ptr<DriveReader> Create(const std::string& drive);
   ~DriveReader();
+
   BlobType GetBlobType() const override { return BlobType::DRIVE; }
+
   u64 GetRawSize() const override { return m_size; }
   u64 GetDataSize() const override { return m_size; }
   bool IsDataSizeAccurate() const override { return true; }
 
+  u64 GetBlockSize() const override { return ECC_BLOCK_SIZE; }
+
 private:
   DriveReader(const std::string& drive);
   bool GetBlock(u64 block_num, u8* out_ptr) override;
@@ -41,6 +45,7 @@ private:
   File::IOFile m_file;
   bool IsOK() const { return m_file.IsOpen() && m_file.IsGood(); }
 #endif
+  static constexpr u64 ECC_BLOCK_SIZE = 0x8000;
   u64 m_size = 0;
 };
 
diff --git a/Source/Core/DiscIO/FileBlob.cpp b/Source/Core/DiscIO/FileBlob.cpp
index 9e0486d969..ca0aa2cfd0 100644
--- a/Source/Core/DiscIO/FileBlob.cpp
+++ b/Source/Core/DiscIO/FileBlob.cpp
@@ -2,10 +2,15 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>
+#include <vector>
 
+#include "Common/Assert.h"
+#include "Common/FileUtil.h"
+#include "Common/MsgHandler.h"
 #include "DiscIO/FileBlob.h"
 
 namespace DiscIO
@@ -36,4 +41,76 @@ bool PlainFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
   }
 }
 
+bool ConvertToPlain(BlobReader* infile, const std::string& infile_path,
+                    const std::string& outfile_path, CompressCB callback, void* arg)
+{
+  ASSERT(infile->IsDataSizeAccurate());
+
+  File::IOFile outfile(outfile_path, "wb");
+  if (!outfile)
+  {
+    PanicAlertT("Failed to open the output file \"%s\".\n"
+                "Check that you have permissions to write the target folder and that the media can "
+                "be written.",
+                outfile_path.c_str());
+    return false;
+  }
+
+  constexpr size_t DESIRED_BUFFER_SIZE = 0x80000;
+  u64 buffer_size = infile->GetBlockSize();
+  if (buffer_size == 0)
+  {
+    buffer_size = DESIRED_BUFFER_SIZE;
+  }
+  else
+  {
+    while (buffer_size < DESIRED_BUFFER_SIZE)
+      buffer_size *= 2;
+  }
+
+  std::vector<u8> buffer(buffer_size);
+  const u64 num_buffers = (infile->GetDataSize() + buffer_size - 1) / buffer_size;
+  int progress_monitor = std::max<int>(1, num_buffers / 100);
+  bool success = true;
+
+  for (u64 i = 0; i < num_buffers; i++)
+  {
+    if (i % progress_monitor == 0)
+    {
+      const bool was_cancelled =
+          !callback(Common::GetStringT("Unpacking"), (float)i / (float)num_buffers, arg);
+      if (was_cancelled)
+      {
+        success = false;
+        break;
+      }
+    }
+    const u64 inpos = i * buffer_size;
+    const u64 sz = std::min(buffer_size, infile->GetDataSize() - inpos);
+    if (!infile->Read(inpos, sz, buffer.data()))
+    {
+      PanicAlertT("Failed to read from the input file \"%s\".", infile_path.c_str());
+      success = false;
+      break;
+    }
+    if (!outfile.WriteBytes(buffer.data(), sz))
+    {
+      PanicAlertT("Failed to write the output file \"%s\".\n"
+                  "Check that you have enough space available on the target drive.",
+                  outfile_path.c_str());
+      success = false;
+      break;
+    }
+  }
+
+  if (!success)
+  {
+    // Remove the incomplete output file.
+    outfile.Close();
+    File::Delete(outfile_path);
+  }
+
+  return success;
+}
+
 }  // namespace DiscIO
diff --git a/Source/Core/DiscIO/ScrubbedBlob.cpp b/Source/Core/DiscIO/ScrubbedBlob.cpp
new file mode 100644
index 0000000000..255edebf57
--- /dev/null
+++ b/Source/Core/DiscIO/ScrubbedBlob.cpp
@@ -0,0 +1,67 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DiscIO/ScrubbedBlob.h"
+
+#include <algorithm>
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "Common/Align.h"
+#include "DiscIO/Blob.h"
+#include "DiscIO/DiscScrubber.h"
+#include "DiscIO/Volume.h"
+
+namespace DiscIO
+{
+ScrubbedBlob::ScrubbedBlob(std::unique_ptr<BlobReader> blob_reader, DiscScrubber scrubber)
+    : m_blob_reader(std::move(blob_reader)), m_scrubber(std::move(scrubber))
+{
+}
+
+std::unique_ptr<ScrubbedBlob> ScrubbedBlob::Create(const std::string& path)
+{
+  std::unique_ptr<VolumeDisc> disc = CreateDisc(path);
+  if (!disc)
+    return nullptr;
+
+  DiscScrubber scrubber;
+  if (!scrubber.SetupScrub(disc.get()))
+    return nullptr;
+
+  std::unique_ptr<BlobReader> blob = CreateBlobReader(path);
+  if (!blob)
+    return nullptr;
+
+  return std::unique_ptr<ScrubbedBlob>(new ScrubbedBlob(std::move(blob), std::move(scrubber)));
+}
+
+bool ScrubbedBlob::Read(u64 offset, u64 size, u8* out_ptr)
+{
+  while (size > 0)
+  {
+    constexpr size_t CLUSTER_SIZE = DiscScrubber::CLUSTER_SIZE;
+    const u64 bytes_to_read =
+        std::min(Common::AlignDown(offset + CLUSTER_SIZE, CLUSTER_SIZE) - offset, size);
+
+    if (m_scrubber.CanBlockBeScrubbed(offset))
+    {
+      std::fill_n(out_ptr, bytes_to_read, 0);
+    }
+    else
+    {
+      if (!m_blob_reader->Read(offset, bytes_to_read, out_ptr))
+        return false;
+    }
+
+    offset += bytes_to_read;
+    size -= bytes_to_read;
+    out_ptr += bytes_to_read;
+  }
+
+  return true;
+}
+
+}  // namespace DiscIO
diff --git a/Source/Core/DiscIO/ScrubbedBlob.h b/Source/Core/DiscIO/ScrubbedBlob.h
new file mode 100644
index 0000000000..b98b78681e
--- /dev/null
+++ b/Source/Core/DiscIO/ScrubbedBlob.h
@@ -0,0 +1,37 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "DiscIO/Blob.h"
+#include "DiscIO/DiscScrubber.h"
+
+namespace DiscIO
+{
+// This class wraps another BlobReader and zeroes out data that has been
+// identified by DiscScrubber as unused.
+class ScrubbedBlob : public BlobReader
+{
+public:
+  static std::unique_ptr<ScrubbedBlob> Create(const std::string& path);
+
+  BlobType GetBlobType() const override { return m_blob_reader->GetBlobType(); }
+  u64 GetRawSize() const override { return m_blob_reader->GetRawSize(); }
+  u64 GetDataSize() const override { return m_blob_reader->GetDataSize(); }
+  bool IsDataSizeAccurate() const override { return m_blob_reader->IsDataSizeAccurate(); }
+  u64 GetBlockSize() const override { return m_blob_reader->GetBlockSize(); }
+
+  bool Read(u64 offset, u64 size, u8* out_ptr) override;
+
+private:
+  ScrubbedBlob(std::unique_ptr<BlobReader> blob_reader, DiscScrubber scrubber);
+
+  std::unique_ptr<BlobReader> m_blob_reader;
+  DiscScrubber m_scrubber;
+};
+
+}  // namespace DiscIO
diff --git a/Source/Core/DiscIO/VolumeVerifier.cpp b/Source/Core/DiscIO/VolumeVerifier.cpp
index 354e843e92..38c6fd2e35 100644
--- a/Source/Core/DiscIO/VolumeVerifier.cpp
+++ b/Source/Core/DiscIO/VolumeVerifier.cpp
@@ -1040,7 +1040,7 @@ void VolumeVerifier::SetUpHashing()
   else if (m_volume.GetVolumeType() == Platform::WiiDisc)
   {
     // Set up a DiscScrubber for checking whether blocks with errors are unused
-    m_scrubber.SetupScrub(&m_volume, VolumeWii::BLOCK_TOTAL_SIZE);
+    m_scrubber.SetupScrub(&m_volume);
   }
 
   std::sort(m_blocks.begin(), m_blocks.end(),
diff --git a/Source/Core/DiscIO/WbfsBlob.h b/Source/Core/DiscIO/WbfsBlob.h
index 36de02f62d..0283b1c98b 100644
--- a/Source/Core/DiscIO/WbfsBlob.h
+++ b/Source/Core/DiscIO/WbfsBlob.h
@@ -24,6 +24,7 @@ public:
   static std::unique_ptr<WbfsFileReader> Create(File::IOFile file, const std::string& path);
 
   BlobType GetBlobType() const override { return BlobType::WBFS; }
+
   u64 GetRawSize() const override { return m_size; }
   // The WBFS format does not save the original file size.
   // This function returns a constant upper bound
@@ -31,6 +32,8 @@ public:
   u64 GetDataSize() const override;
   bool IsDataSizeAccurate() const override { return false; }
 
+  u64 GetBlockSize() const override { return m_wbfs_sector_size; }
+
   bool Read(u64 offset, u64 nbytes, u8* out_ptr) override;
 
 private:
diff --git a/Source/Core/DolphinQt/CMakeLists.txt b/Source/Core/DolphinQt/CMakeLists.txt
index 4589d4881f..8449920c61 100644
--- a/Source/Core/DolphinQt/CMakeLists.txt
+++ b/Source/Core/DolphinQt/CMakeLists.txt
@@ -18,6 +18,8 @@ add_executable(dolphin-emu
   AboutDialog.h
   CheatsManager.cpp
   CheatsManager.h
+  ConvertDialog.cpp
+  ConvertDialog.h
   DiscordHandler.cpp
   DiscordHandler.h
   DiscordJoinRequestDialog.cpp
diff --git a/Source/Core/DolphinQt/ConvertDialog.cpp b/Source/Core/DolphinQt/ConvertDialog.cpp
new file mode 100644
index 0000000000..44f41e757e
--- /dev/null
+++ b/Source/Core/DolphinQt/ConvertDialog.cpp
@@ -0,0 +1,374 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DolphinQt/ConvertDialog.h"
+
+#include <algorithm>
+#include <functional>
+#include <future>
+#include <memory>
+#include <utility>
+
+#include <QCheckBox>
+#include <QComboBox>
+#include <QErrorMessage>
+#include <QFileDialog>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QLabel>
+#include <QList>
+#include <QMessageBox>
+#include <QPushButton>
+#include <QString>
+#include <QVBoxLayout>
+
+#include "Common/Assert.h"
+#include "Common/Logging/Log.h"
+#include "DiscIO/Blob.h"
+#include "DiscIO/ScrubbedBlob.h"
+#include "DolphinQt/QtUtils/ModalMessageBox.h"
+#include "DolphinQt/QtUtils/ParallelProgressDialog.h"
+#include "UICommon/GameFile.h"
+#include "UICommon/UICommon.h"
+
+static bool CompressCB(const std::string& text, float percent, void* ptr)
+{
+  if (ptr == nullptr)
+    return false;
+
+  auto* progress_dialog = static_cast<ParallelProgressDialog*>(ptr);
+
+  progress_dialog->SetValue(percent * 100);
+  return !progress_dialog->WasCanceled();
+}
+
+ConvertDialog::ConvertDialog(QList<std::shared_ptr<const UICommon::GameFile>> files,
+                             QWidget* parent)
+    : QDialog(parent), m_files(std::move(files))
+{
+  ASSERT(!m_files.empty());
+
+  setWindowTitle(tr("Convert"));
+  setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+
+  QGridLayout* grid_layout = new QGridLayout;
+  grid_layout->setColumnStretch(1, 1);
+
+  m_format = new QComboBox;
+  AddToFormatComboBox(QStringLiteral("ISO"), DiscIO::BlobType::PLAIN);
+  AddToFormatComboBox(QStringLiteral("GCZ"), DiscIO::BlobType::GCZ);
+  grid_layout->addWidget(new QLabel(tr("Format:")), 0, 0);
+  grid_layout->addWidget(m_format, 0, 1);
+
+  m_block_size = new QComboBox;
+  grid_layout->addWidget(new QLabel(tr("Block Size:")), 1, 0);
+  grid_layout->addWidget(m_block_size, 1, 1);
+
+  m_scrub = new QCheckBox;
+  grid_layout->addWidget(new QLabel(tr("Remove Junk Data (Irreversible):")), 2, 0);
+  grid_layout->addWidget(m_scrub, 2, 1);
+  m_scrub->setEnabled(
+      std::none_of(m_files.begin(), m_files.end(), std::mem_fn(&UICommon::GameFile::IsDatelDisc)));
+
+  QPushButton* convert_button = new QPushButton(tr("Convert"));
+
+  QVBoxLayout* options_layout = new QVBoxLayout;
+  options_layout->addLayout(grid_layout);
+  options_layout->addWidget(convert_button);
+  QGroupBox* options_group = new QGroupBox(tr("Options"));
+  options_group->setLayout(options_layout);
+
+  QLabel* info_text =
+      new QLabel(tr("ISO: A simple and robust format which is supported by many programs. "
+                    "It takes up more space than any other format.\n\n"
+                    "GCZ: A basic compressed format which is compatible with most versions of "
+                    "Dolphin and some other programs. It can't efficiently compress junk data "
+                    "(unless removed) or encrypted Wii data."));
+  info_text->setWordWrap(true);
+
+  QVBoxLayout* info_layout = new QVBoxLayout;
+  info_layout->addWidget(info_text);
+  QGroupBox* info_group = new QGroupBox(tr("Info"));
+  info_group->setLayout(info_layout);
+
+  QVBoxLayout* main_layout = new QVBoxLayout;
+  main_layout->addWidget(options_group);
+  main_layout->addWidget(info_group);
+
+  setLayout(main_layout);
+
+  connect(m_format, QOverload<int>::of(&QComboBox::currentIndexChanged), this,
+          &ConvertDialog::OnFormatChanged);
+  connect(convert_button, &QPushButton::clicked, this, &ConvertDialog::Convert);
+
+  OnFormatChanged();
+}
+
+void ConvertDialog::AddToFormatComboBox(const QString& name, DiscIO::BlobType format)
+{
+  if (std::all_of(m_files.begin(), m_files.end(),
+                  [format](const auto& file) { return file->GetBlobType() == format; }))
+  {
+    return;
+  }
+
+  m_format->addItem(name, static_cast<int>(format));
+}
+
+void ConvertDialog::AddToBlockSizeComboBox(int size)
+{
+  m_block_size->addItem(QString::fromStdString(UICommon::FormatSize(size, 0)), size);
+}
+
+void ConvertDialog::OnFormatChanged()
+{
+  // Because DVD timings are emulated as if we can't read less than an entire ECC block at once
+  // (32 KiB - 0x8000), there is little reason to use a block size smaller than that.
+  constexpr int MIN_BLOCK_SIZE = 0x8000;
+
+  // For performance reasons, blocks shouldn't be too large.
+  // 2 MiB (0x200000) was picked because it is the smallest block size supported by WIA.
+  constexpr int MAX_BLOCK_SIZE = 0x200000;
+
+  const DiscIO::BlobType format = static_cast<DiscIO::BlobType>(m_format->currentData().toInt());
+
+  m_block_size->clear();
+  switch (format)
+  {
+  case DiscIO::BlobType::GCZ:
+  {
+    m_block_size->setEnabled(true);
+
+    // In order for versions of Dolphin prior to 5.0-11893 to be able to convert a GCZ file
+    // to ISO without messing up the final part of the file in some way, the file size
+    // must be an integer multiple of the block size (fixed in 3aa463c) and must not be
+    // an integer multiple of the block size multiplied by 32 (fixed in 26b21e3).
+
+    const auto block_size_ok = [this](int block_size) {
+      return std::all_of(m_files.begin(), m_files.end(), [block_size](const auto& file) {
+        constexpr u64 BLOCKS_PER_BUFFER = 32;
+        const u64 file_size = file->GetVolumeSize();
+        return file_size % block_size == 0 && file_size % (block_size * BLOCKS_PER_BUFFER) != 0;
+      });
+    };
+
+    // Add all block sizes in the normal range that do not cause problems
+    for (int block_size = MIN_BLOCK_SIZE; block_size <= MAX_BLOCK_SIZE; block_size *= 2)
+    {
+      if (block_size_ok(block_size))
+        AddToBlockSizeComboBox(block_size);
+    }
+
+    // If we didn't find a good block size, pick the block size which was hardcoded
+    // in older versions of Dolphin. That way, at least we're not worse than older versions.
+    if (m_block_size->count() == 0)
+    {
+      constexpr int FALLBACK_BLOCK_SIZE = 0x4000;
+      if (!block_size_ok(FALLBACK_BLOCK_SIZE))
+      {
+        ERROR_LOG(MASTER_LOG, "Failed to find a block size which does not cause problems "
+                              "when decompressing using an old version of Dolphin");
+      }
+      AddToBlockSizeComboBox(FALLBACK_BLOCK_SIZE);
+    }
+
+    break;
+  }
+  default:
+    m_block_size->setEnabled(false);
+    break;
+  }
+}
+
+bool ConvertDialog::ShowAreYouSureDialog(const QString& text)
+{
+  ModalMessageBox warning(this);
+  warning.setIcon(QMessageBox::Warning);
+  warning.setWindowTitle(tr("Confirm"));
+  warning.setText(tr("Are you sure?"));
+  warning.setInformativeText(text);
+  warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+
+  return warning.exec() == QMessageBox::Yes;
+}
+
+void ConvertDialog::Convert()
+{
+  const DiscIO::BlobType format = static_cast<DiscIO::BlobType>(m_format->currentData().toInt());
+  const int block_size = m_block_size->currentData().toInt();
+  const bool scrub = m_scrub->isChecked();
+
+  if (scrub && format == DiscIO::BlobType::PLAIN)
+  {
+    if (!ShowAreYouSureDialog(tr("Removing junk data does not save any space when converting to "
+                                 "ISO (unless you package the ISO file in a compressed file format "
+                                 "such as ZIP afterwards). Do you want to continue anyway?")))
+    {
+      return;
+    }
+  }
+
+  if (!scrub && format == DiscIO::BlobType::GCZ &&
+      std::any_of(m_files.begin(), m_files.end(), [](const auto& file) {
+        return file->GetPlatform() == DiscIO::Platform::WiiDisc && !file->IsDatelDisc();
+      }))
+  {
+    if (!ShowAreYouSureDialog(tr("Converting Wii disc images to GCZ without removing junk data "
+                                 "does not save any noticeable amount of space compared to "
+                                 "converting to ISO. Do you want to continue anyway?")))
+    {
+      return;
+    }
+  }
+
+  QString extension;
+  QString filter;
+  switch (format)
+  {
+  case DiscIO::BlobType::PLAIN:
+    extension = QStringLiteral(".iso");
+    filter = tr("Uncompressed GC/Wii images (*.iso *.gcm)");
+    break;
+  case DiscIO::BlobType::GCZ:
+    extension = QStringLiteral(".gcz");
+    filter = tr("Compressed GC/Wii images (*.gcz)");
+    break;
+  default:
+    ASSERT(false);
+    return;
+  }
+
+  QString dst_dir;
+  QString dst_path;
+
+  if (m_files.size() > 1)
+  {
+    dst_dir = QFileDialog::getExistingDirectory(
+        this, tr("Select where you want to save the converted images"),
+        QFileInfo(QString::fromStdString(m_files[0]->GetFilePath())).dir().absolutePath());
+
+    if (dst_dir.isEmpty())
+      return;
+  }
+  else
+  {
+    dst_path = QFileDialog::getSaveFileName(
+        this, tr("Select where you want to save the converted image"),
+        QFileInfo(QString::fromStdString(m_files[0]->GetFilePath()))
+            .dir()
+            .absoluteFilePath(
+                QFileInfo(QString::fromStdString(m_files[0]->GetFilePath())).completeBaseName())
+            .append(extension),
+        filter);
+
+    if (dst_path.isEmpty())
+      return;
+  }
+
+  for (const auto& file : m_files)
+  {
+    const auto original_path = file->GetFilePath();
+    if (m_files.size() > 1)
+    {
+      dst_path =
+          QDir(dst_dir)
+              .absoluteFilePath(QFileInfo(QString::fromStdString(original_path)).completeBaseName())
+              .append(extension);
+      QFileInfo dst_info = QFileInfo(dst_path);
+      if (dst_info.exists())
+      {
+        ModalMessageBox confirm_replace(this);
+        confirm_replace.setIcon(QMessageBox::Warning);
+        confirm_replace.setWindowTitle(tr("Confirm"));
+        confirm_replace.setText(tr("The file %1 already exists.\n"
+                                   "Do you wish to replace it?")
+                                    .arg(dst_info.fileName()));
+        confirm_replace.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+
+        if (confirm_replace.exec() == QMessageBox::No)
+          continue;
+      }
+    }
+
+    ParallelProgressDialog progress_dialog(tr("Converting..."), tr("Abort"), 0, 100, this);
+    progress_dialog.GetRaw()->setWindowModality(Qt::WindowModal);
+    progress_dialog.GetRaw()->setWindowTitle(tr("Progress"));
+
+    if (m_files.size() > 1)
+    {
+      progress_dialog.GetRaw()->setLabelText(
+          tr("Converting...") + QLatin1Char{'\n'} +
+          QFileInfo(QString::fromStdString(original_path)).fileName());
+    }
+
+    std::unique_ptr<DiscIO::BlobReader> blob_reader;
+    bool scrub_current_file = scrub;
+
+    if (scrub_current_file)
+    {
+      blob_reader = DiscIO::ScrubbedBlob::Create(original_path);
+      if (!blob_reader)
+      {
+        const int result =
+            ModalMessageBox::warning(this, tr("Question"),
+                                     tr("Failed to remove junk data from file \"%1\".\n\n"
+                                        "Would you like to convert it without removing junk data?")
+                                         .arg(QString::fromStdString(original_path)),
+                                     QMessageBox::Ok | QMessageBox::Abort);
+
+        if (result == QMessageBox::Ok)
+          scrub_current_file = false;
+        else
+          return;
+      }
+    }
+
+    if (!scrub_current_file)
+      blob_reader = DiscIO::CreateBlobReader(original_path);
+
+    if (!blob_reader)
+    {
+      QErrorMessage(this).showMessage(
+          tr("Failed to open the input file \"%1\".").arg(QString::fromStdString(original_path)));
+    }
+    else
+    {
+      std::future<bool> good;
+
+      if (format == DiscIO::BlobType::PLAIN)
+      {
+        good = std::async(std::launch::async, [&] {
+          const bool good =
+              DiscIO::ConvertToPlain(blob_reader.get(), original_path, dst_path.toStdString(),
+                                     &CompressCB, &progress_dialog);
+          progress_dialog.Reset();
+          return good;
+        });
+      }
+      else if (format == DiscIO::BlobType::GCZ)
+      {
+        good = std::async(std::launch::async, [&] {
+          const bool good =
+              DiscIO::ConvertToGCZ(blob_reader.get(), original_path, dst_path.toStdString(),
+                                   file->GetPlatform() == DiscIO::Platform::WiiDisc ? 1 : 0,
+                                   block_size, &CompressCB, &progress_dialog);
+          progress_dialog.Reset();
+          return good;
+        });
+      }
+
+      progress_dialog.GetRaw()->exec();
+      if (!good.get())
+      {
+        QErrorMessage(this).showMessage(tr("Dolphin failed to complete the requested action."));
+        return;
+      }
+    }
+  }
+
+  ModalMessageBox::information(this, tr("Success"),
+                               tr("Successfully converted %n image(s).", "", m_files.size()));
+
+  close();
+}
diff --git a/Source/Core/DolphinQt/ConvertDialog.h b/Source/Core/DolphinQt/ConvertDialog.h
new file mode 100644
index 0000000000..1ff80b4a07
--- /dev/null
+++ b/Source/Core/DolphinQt/ConvertDialog.h
@@ -0,0 +1,44 @@
+// Copyright 2020 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+
+#include <QDialog>
+#include <QList>
+
+#include "DiscIO/Blob.h"
+
+class QCheckBox;
+class QComboBox;
+
+namespace UICommon
+{
+class GameFile;
+}
+
+class ConvertDialog final : public QDialog
+{
+  Q_OBJECT
+
+public:
+  explicit ConvertDialog(QList<std::shared_ptr<const UICommon::GameFile>> files,
+                         QWidget* parent = nullptr);
+
+private slots:
+  void OnFormatChanged();
+  void Convert();
+
+private:
+  void AddToFormatComboBox(const QString& name, DiscIO::BlobType format);
+  void AddToBlockSizeComboBox(int size);
+
+  bool ShowAreYouSureDialog(const QString& text);
+
+  QComboBox* m_format;
+  QComboBox* m_block_size;
+  QCheckBox* m_scrub;
+  QList<std::shared_ptr<const UICommon::GameFile>> m_files;
+};
diff --git a/Source/Core/DolphinQt/DolphinQt.vcxproj b/Source/Core/DolphinQt/DolphinQt.vcxproj
index c6dccf12c1..023f50a5e1 100644
--- a/Source/Core/DolphinQt/DolphinQt.vcxproj
+++ b/Source/Core/DolphinQt/DolphinQt.vcxproj
@@ -131,6 +131,7 @@
     <QtMoc Include="Config\PropertiesDialog.h" />
     <QtMoc Include="Config\SettingsWindow.h" />
     <QtMoc Include="Config\VerifyWidget.h" />
+    <QtMoc Include="ConvertDialog.h" />
     <QtMoc Include="DiscordHandler.h" />
     <QtMoc Include="DiscordJoinRequestDialog.h" />
     <QtMoc Include="FIFO\FIFOAnalyzer.h" />
@@ -212,6 +213,7 @@
     <ClCompile Include="$(QtMocOutPrefix)DualShockUDPClientWidget.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)ControllerInterfaceWindow.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)ControllersWindow.cpp" />
+    <ClCompile Include="$(QtMocOutPrefix)ConvertDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)DiscordHandler.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)DiscordJoinRequestDialog.cpp" />
     <ClCompile Include="$(QtMocOutPrefix)DoubleClickEventFilter.cpp" />
@@ -374,6 +376,7 @@
     <ClCompile Include="Config\PropertiesDialog.cpp" />
     <ClCompile Include="Config\SettingsWindow.cpp" />
     <ClCompile Include="Config\VerifyWidget.cpp" />
+    <ClCompile Include="ConvertDialog.cpp" />
     <ClCompile Include="Debugger\CodeViewWidget.cpp" />
     <ClCompile Include="Debugger\CodeWidget.cpp" />
     <ClCompile Include="Debugger\JITWidget.cpp" />
diff --git a/Source/Core/DolphinQt/GameList/GameList.cpp b/Source/Core/DolphinQt/GameList/GameList.cpp
index 28922ecc0b..12c7cacc37 100644
--- a/Source/Core/DolphinQt/GameList/GameList.cpp
+++ b/Source/Core/DolphinQt/GameList/GameList.cpp
@@ -6,7 +6,7 @@
 
 #include <algorithm>
 #include <cmath>
-#include <future>
+#include <utility>
 
 #include <QDesktopServices>
 #include <QDir>
@@ -40,6 +40,7 @@
 #include "DiscIO/Enums.h"
 
 #include "DolphinQt/Config/PropertiesDialog.h"
+#include "DolphinQt/ConvertDialog.h"
 #include "DolphinQt/GameList/GameListModel.h"
 #include "DolphinQt/GameList/GridProxyModel.h"
 #include "DolphinQt/GameList/ListProxyModel.h"
@@ -53,8 +54,6 @@
 
 #include "UICommon/GameFile.h"
 
-static bool CompressCB(const std::string&, float, void*);
-
 GameList::GameList(QWidget* parent) : QStackedWidget(parent)
 {
   m_model = Settings::Instance().GetGameListModel();
@@ -257,35 +256,16 @@ void GameList::ShowContextMenu(const QPoint&)
 
   if (HasMultipleSelected())
   {
-    bool wii_saves = true;
-    bool compress = false;
-    bool decompress = false;
-
-    for (const auto& game : GetSelectedGames())
+    if (std::all_of(GetSelectedGames().begin(), GetSelectedGames().end(), [](const auto& game) {
+          return DiscIO::IsDisc(game->GetPlatform()) && game->IsVolumeSizeAccurate();
+        }))
     {
-      DiscIO::Platform platform = game->GetPlatform();
-
-      if (platform == DiscIO::Platform::GameCubeDisc || platform == DiscIO::Platform::WiiDisc)
-      {
-        const auto blob_type = game->GetBlobType();
-        if (blob_type == DiscIO::BlobType::GCZ)
-          decompress = true;
-        else if (blob_type == DiscIO::BlobType::PLAIN)
-          compress = true;
-      }
-
-      if (platform != DiscIO::Platform::WiiWAD && platform != DiscIO::Platform::WiiDisc)
-        wii_saves = false;
+      menu->addAction(tr("Convert Selected Files..."), this, &GameList::ConvertFile);
+      menu->addSeparator();
     }
 
-    if (compress)
-      menu->addAction(tr("Compress Selected ISOs..."), this, [this] { CompressISO(false); });
-    if (decompress)
-      menu->addAction(tr("Decompress Selected ISOs..."), this, [this] { CompressISO(true); });
-    if (compress || decompress)
-      menu->addSeparator();
-
-    if (wii_saves)
+    if (std::all_of(GetSelectedGames().begin(), GetSelectedGames().end(),
+                    [](const auto& game) { return DiscIO::IsWii(game->GetPlatform()); }))
     {
       menu->addAction(tr("Export Wii Saves"), this, &GameList::ExportWiiSave);
       menu->addSeparator();
@@ -306,15 +286,13 @@ void GameList::ShowContextMenu(const QPoint&)
       menu->addSeparator();
     }
 
-    if (platform == DiscIO::Platform::GameCubeDisc || platform == DiscIO::Platform::WiiDisc)
+    if (DiscIO::IsDisc(platform))
     {
       menu->addAction(tr("Set as &Default ISO"), this, &GameList::SetDefaultISO);
       const auto blob_type = game->GetBlobType();
 
-      if (blob_type == DiscIO::BlobType::GCZ)
-        menu->addAction(tr("Decompress ISO..."), this, [this] { CompressISO(true); });
-      else if (blob_type == DiscIO::BlobType::PLAIN)
-        menu->addAction(tr("Compress ISO..."), this, [this] { CompressISO(false); });
+      if (game->IsVolumeSizeAccurate())
+        menu->addAction(tr("Convert File..."), this, &GameList::ConvertFile);
 
       QAction* change_disc = menu->addAction(tr("Change &Disc"), this, &GameList::ChangeDisc);
 
@@ -481,157 +459,14 @@ void GameList::OpenWiki()
   QDesktopServices::openUrl(QUrl(url));
 }
 
-void GameList::CompressISO(bool decompress)
+void GameList::ConvertFile()
 {
-  auto files = GetSelectedGames();
-  const auto game = GetSelectedGame();
-
-  if (files.empty() || !game)
+  auto games = GetSelectedGames();
+  if (games.empty())
     return;
 
-  bool wii_warning_given = false;
-  for (QMutableListIterator<std::shared_ptr<const UICommon::GameFile>> it(files); it.hasNext();)
-  {
-    auto file = it.next();
-
-    if ((file->GetPlatform() != DiscIO::Platform::GameCubeDisc &&
-         file->GetPlatform() != DiscIO::Platform::WiiDisc) ||
-        (decompress && file->GetBlobType() != DiscIO::BlobType::GCZ) ||
-        (!decompress && file->GetBlobType() != DiscIO::BlobType::PLAIN))
-    {
-      it.remove();
-      continue;
-    }
-
-    if (!wii_warning_given && !decompress && file->GetPlatform() == DiscIO::Platform::WiiDisc)
-    {
-      ModalMessageBox wii_warning(this);
-      wii_warning.setIcon(QMessageBox::Warning);
-      wii_warning.setWindowTitle(tr("Confirm"));
-      wii_warning.setText(tr("Are you sure?"));
-      wii_warning.setInformativeText(tr(
-          "Compressing a Wii disc image will irreversibly change the compressed copy by removing "
-          "padding data. Your disc image will still work. Continue?"));
-      wii_warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
-
-      if (wii_warning.exec() == QMessageBox::No)
-        return;
-
-      wii_warning_given = true;
-    }
-  }
-
-  QString dst_dir;
-  QString dst_path;
-
-  if (files.size() > 1)
-  {
-    dst_dir = QFileDialog::getExistingDirectory(
-        this,
-        decompress ? tr("Select where you want to save the decompressed images") :
-                     tr("Select where you want to save the compressed images"),
-        QFileInfo(QString::fromStdString(game->GetFilePath())).dir().absolutePath());
-
-    if (dst_dir.isEmpty())
-      return;
-  }
-  else
-  {
-    dst_path = QFileDialog::getSaveFileName(
-        this,
-        decompress ? tr("Select where you want to save the decompressed image") :
-                     tr("Select where you want to save the compressed image"),
-        QFileInfo(QString::fromStdString(game->GetFilePath()))
-            .dir()
-            .absoluteFilePath(
-                QFileInfo(QString::fromStdString(files[0]->GetFilePath())).completeBaseName())
-            .append(decompress ? QStringLiteral(".gcm") : QStringLiteral(".gcz")),
-        decompress ? tr("Uncompressed GC/Wii images (*.iso *.gcm)") :
-                     tr("Compressed GC/Wii images (*.gcz)"));
-
-    if (dst_path.isEmpty())
-      return;
-  }
-
-  for (const auto& file : files)
-  {
-    const auto original_path = file->GetFilePath();
-    if (files.size() > 1)
-    {
-      dst_path =
-          QDir(dst_dir)
-              .absoluteFilePath(QFileInfo(QString::fromStdString(original_path)).completeBaseName())
-              .append(decompress ? QStringLiteral(".gcm") : QStringLiteral(".gcz"));
-      QFileInfo dst_info = QFileInfo(dst_path);
-      if (dst_info.exists())
-      {
-        ModalMessageBox confirm_replace(this);
-        confirm_replace.setIcon(QMessageBox::Warning);
-        confirm_replace.setWindowTitle(tr("Confirm"));
-        confirm_replace.setText(tr("The file %1 already exists.\n"
-                                   "Do you wish to replace it?")
-                                    .arg(dst_info.fileName()));
-        confirm_replace.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
-
-        if (confirm_replace.exec() == QMessageBox::No)
-          continue;
-      }
-    }
-
-    ParallelProgressDialog progress_dialog(
-        decompress ? tr("Decompressing...") : tr("Compressing..."), tr("Abort"), 0, 100, this);
-    progress_dialog.GetRaw()->setWindowModality(Qt::WindowModal);
-    progress_dialog.GetRaw()->setWindowTitle(tr("Progress"));
-
-    std::future<bool> good;
-
-    if (decompress)
-    {
-      if (files.size() > 1)
-      {
-        progress_dialog.GetRaw()->setLabelText(
-            tr("Decompressing...") + QLatin1Char{'\n'} +
-            QFileInfo(QString::fromStdString(original_path)).fileName());
-      }
-
-      good = std::async(std::launch::async, [&] {
-        const bool good = DiscIO::DecompressBlobToFile(original_path, dst_path.toStdString(),
-                                                       &CompressCB, &progress_dialog);
-        progress_dialog.Reset();
-        return good;
-      });
-    }
-    else
-    {
-      if (files.size() > 1)
-      {
-        progress_dialog.GetRaw()->setLabelText(
-            tr("Compressing...") + QLatin1Char{'\n'} +
-            QFileInfo(QString::fromStdString(original_path)).fileName());
-      }
-
-      good = std::async(std::launch::async, [&] {
-        const bool good =
-            DiscIO::CompressFileToBlob(original_path, dst_path.toStdString(),
-                                       file->GetPlatform() == DiscIO::Platform::WiiDisc ? 1 : 0,
-                                       16384, &CompressCB, &progress_dialog);
-        progress_dialog.Reset();
-        return good;
-      });
-    }
-
-    progress_dialog.GetRaw()->exec();
-    if (!good.get())
-    {
-      QErrorMessage(this).showMessage(tr("Dolphin failed to complete the requested action."));
-      return;
-    }
-  }
-
-  ModalMessageBox::information(this, tr("Success"),
-                               decompress ?
-                                   tr("Successfully decompressed %n image(s).", "", files.size()) :
-                                   tr("Successfully compressed %n image(s).", "", files.size()));
+  ConvertDialog dialog{std::move(games), this};
+  dialog.exec();
 }
 
 void GameList::InstallWAD()
@@ -953,17 +788,6 @@ void GameList::OnGameListVisibilityChanged()
   m_grid_proxy->invalidate();
 }
 
-static bool CompressCB(const std::string& text, float percent, void* ptr)
-{
-  if (ptr == nullptr)
-    return false;
-
-  auto* progress_dialog = static_cast<ParallelProgressDialog*>(ptr);
-
-  progress_dialog->SetValue(percent * 100);
-  return !progress_dialog->WasCanceled();
-}
-
 void GameList::OnSectionResized(int index, int, int)
 {
   auto* hor_header = m_list->horizontalHeader();
diff --git a/Source/Core/DolphinQt/GameList/GameList.h b/Source/Core/DolphinQt/GameList/GameList.h
index 5192e89230..f64ddd61f0 100644
--- a/Source/Core/DolphinQt/GameList/GameList.h
+++ b/Source/Core/DolphinQt/GameList/GameList.h
@@ -64,7 +64,7 @@ private:
   void InstallWAD();
   void UninstallWAD();
   void ExportWiiSave();
-  void CompressISO(bool decompress);
+  void ConvertFile();
   void ChangeDisc();
   void NewTag();
   void DeleteTag();
diff --git a/Source/Core/UICommon/GameFile.cpp b/Source/Core/UICommon/GameFile.cpp
index cc64d9d3e9..ca5c53ae31 100644
--- a/Source/Core/UICommon/GameFile.cpp
+++ b/Source/Core/UICommon/GameFile.cpp
@@ -38,6 +38,7 @@
 #include "Core/TitleDatabase.h"
 
 #include "DiscIO/Blob.h"
+#include "DiscIO/DiscExtractor.h"
 #include "DiscIO/Enums.h"
 #include "DiscIO/Volume.h"
 #include "DiscIO/WiiSaveBanner.h"
@@ -116,6 +117,9 @@ GameFile::GameFile(std::string path) : m_file_path(std::move(path))
       m_blob_type = volume->GetBlobType();
       m_file_size = volume->GetRawSize();
       m_volume_size = volume->GetSize();
+      m_volume_size_is_accurate = volume->IsSizeAccurate();
+      m_is_datel_disc = DiscIO::IsDisc(m_platform) &&
+                        !DiscIO::GetBootDOLOffset(*volume, volume->GetGamePartition());
 
       m_internal_name = volume->GetInternalName();
       m_game_id = volume->GetGameID();
@@ -136,6 +140,8 @@ GameFile::GameFile(std::string path) : m_file_path(std::move(path))
   {
     m_valid = true;
     m_file_size = m_volume_size = File::GetSize(m_file_path);
+    m_volume_size_is_accurate = true;
+    m_is_datel_disc = false;
     m_platform = DiscIO::Platform::ELFOrDOL;
     m_blob_type = DiscIO::BlobType::DIRECTORY;
   }
@@ -296,6 +302,8 @@ void GameFile::DoState(PointerWrap& p)
 
   p.Do(m_file_size);
   p.Do(m_volume_size);
+  p.Do(m_volume_size_is_accurate);
+  p.Do(m_is_datel_disc);
 
   p.Do(m_short_names);
   p.Do(m_long_names);
diff --git a/Source/Core/UICommon/GameFile.h b/Source/Core/UICommon/GameFile.h
index 87513118a9..e3c29860f4 100644
--- a/Source/Core/UICommon/GameFile.h
+++ b/Source/Core/UICommon/GameFile.h
@@ -89,6 +89,8 @@ public:
   const std::string& GetApploaderDate() const { return m_apploader_date; }
   u64 GetFileSize() const { return m_file_size; }
   u64 GetVolumeSize() const { return m_volume_size; }
+  bool IsVolumeSizeAccurate() const { return m_volume_size_is_accurate; }
+  bool IsDatelDisc() const { return m_is_datel_disc; }
   const GameBanner& GetBannerImage() const;
   const GameCover& GetCoverImage() const;
   void DoState(PointerWrap& p);
@@ -124,6 +126,8 @@ private:
 
   u64 m_file_size{};
   u64 m_volume_size{};
+  bool m_volume_size_is_accurate{};
+  bool m_is_datel_disc{};
 
   std::map<DiscIO::Language, std::string> m_short_names;
   std::map<DiscIO::Language, std::string> m_long_names;
diff --git a/Source/Core/UICommon/GameFileCache.cpp b/Source/Core/UICommon/GameFileCache.cpp
index 07cbf726c4..9b2729407e 100644
--- a/Source/Core/UICommon/GameFileCache.cpp
+++ b/Source/Core/UICommon/GameFileCache.cpp
@@ -27,7 +27,7 @@
 
 namespace UICommon
 {
-static constexpr u32 CACHE_REVISION = 16;  // Last changed in PR 8313
+static constexpr u32 CACHE_REVISION = 17;  // Last changed in PR 8738
 
 std::vector<std::string> FindAllGamePaths(const std::vector<std::string>& directories_to_scan,
                                           bool recursive_scan)
diff --git a/Source/Core/UICommon/UICommon.cpp b/Source/Core/UICommon/UICommon.cpp
index 5af9192711..adff5adca3 100644
--- a/Source/Core/UICommon/UICommon.cpp
+++ b/Source/Core/UICommon/UICommon.cpp
@@ -453,7 +453,7 @@ void EnableScreenSaver(bool enable)
 #endif
 }
 
-std::string FormatSize(u64 bytes)
+std::string FormatSize(u64 bytes, int decimals)
 {
   // i18n: The symbol for the unit "bytes"
   const char* const unit_symbols[] = {_trans("B"),   _trans("KiB"), _trans("MiB"), _trans("GiB"),
@@ -468,7 +468,7 @@ std::string FormatSize(u64 bytes)
   // Don't need exact values, only 5 most significant digits
   const double unit_size = std::pow(2, unit * 10);
   std::ostringstream ss;
-  ss << std::fixed << std::setprecision(2);
+  ss << std::fixed << std::setprecision(decimals);
   ss << bytes / unit_size << ' ' << Common::GetStringT(unit_symbols[unit]);
   return ss.str();
 }
diff --git a/Source/Core/UICommon/UICommon.h b/Source/Core/UICommon/UICommon.h
index b7169bfb15..2722559a2a 100644
--- a/Source/Core/UICommon/UICommon.h
+++ b/Source/Core/UICommon/UICommon.h
@@ -32,5 +32,5 @@ void SaveWiimoteSources();
 
 // Return a pretty file size string from byte count.
 // e.g. 1134278 -> "1.08 MiB"
-std::string FormatSize(u64 bytes);
+std::string FormatSize(u64 bytes, int decimals = 2);
 }  // namespace UICommon