rom-weaver

Compress ISO or BIN/CUE to CHD online

Compress ISO or BIN/CUE disc images to CHD locally in your browser. Use this CHD converter without uploads or an account.

Add the disc

  1. Open Compress.
  2. Add the .iso, or add the .cue with every referenced .bin file.
  3. Keep only that disc's files in Inputs.

Add a DVD-style ISO alone. For a CD, if disc.cue names track01.bin and track02.bin, add all three, including audio tracks. Keep filenames unchanged: the cue sheet names and orders them. Renaming BIN to ISO does not convert sectors. With a single .iso, CHD appears in Output only when the file's size is a whole number of 2048- or 2352-byte sectors. With a single .bin, it also needs the content check that marks a CD image. A cartridge .bin of a sector-aligned size gets only ZIP and 7z. With a cue sheet, CHD is missing if you add a second sheet, an extra file the sheet does not name, or tracks with the same base name. An unaligned .iso still lists RVZ, which has no size check.

Compress creates only CD, GD-ROM, and DVD CHDs. It cannot create hard-disk or raw CHDs, so a hard-disk or raw .bin is not offered CHD, and an image with another extension or an unaligned size can only be added to a ZIP or 7z. A hard-disk or raw .bin can still become a CHD when you choose CHD as the Apply or Weave output. For the others, use the native CLI; the formats reference lists the exact rules.

Create the CHD

  1. In Output, choose CHD.
  2. Enter the output filename without its extension.
  3. Keep the default codecs, or open Options to change compression settings.
  4. Select Compress and wait for the result.
  5. Select Download and save the .chd file.

The output picker offers CHD only for compatible disc inputs. Changing an extension does not convert the disc.

If CHD is unavailable, remove unrelated files and check that every CUE track is present. Compress accepts one disc at a time.

For an image inside ZIP or 7z, add the archive to Compress. Select the ISO or the complete CUE/BIN set, then select Add N files.

Check compatibility and storage

CHD can reduce disc storage while preserving the disc layout. Emulator support varies by system and emulator version.

Allow space for source, staged tracks, output, and download. Browser quotas and memory vary by device; compression savings are not guaranteed. For repeated memory/storage errors, use native compression.

Before deleting sources, extract the CHD and test it in your emulator. Compare DVD ISO checksums with Checksum file; compare CD tracks only with matching split/combined layouts. The synthetic disc tutorial supplies known bytes for practice.

To reverse this workflow, follow Convert CHD to ISO, BIN/CUE, or GDI. Choosing a compression format compares CHD with RVZ and archives.