isoconverter

Convert a Dreamcast GDI to CHD.

Drop a .gdi with its track files and get one compressed .chd, the same disc chdman would make. Nothing is uploaded.

or drop them anywhere on the page:Works with: .iso .img .bin + .cue .chd .cso a folder

- 0%

Inside this disc

Click a file to save just that file. Nothing else is read.

- 0%
Saved.

Looking inside works on one disc at a time. Remove files from the list until one is left, and its contents show up here.

Convert

Repack every file on this disc into a format you can open anywhere.

The files inside
The whole disc

Compressed, opens on any device. The safe default.

- 0%
Ready: download
- 0%

Verify

Make sure the download isn't broken. Work out the checksum, then compare it with the one listed wherever you got the file. If they don't match exactly, download it again.

Reading file… 0%

Check against Redump

See whether this disc is a known good dump, file for file. Download the .dat for its console from redump.org and add it here. It stays on your device.

-0%

Info

Ready: download

Edit

Take files out or add new ones, then build the changed disc as a new ISO. The original file is never touched.

0 files

New files go in the top folder of the disc. A file with the same name as one on the disc replaces it.

- 0%
Ready: download

Build an ISO from this folder

- 0%
Ready: download

How to convert a GDI to CHD

  1. Drop the .gdi together with all of its track files (.bin and .raw) on the disc above.
  2. Pick .chd under The whole disc.
  3. Click Convert to .chd.

What you can do with it

Nine jobs people usually need a desktop app for. All of them run in this tab, with no upload, no server and no account.

Get files out of an ISO

Open the disc and click a file, or save everything to a folder. Only what you save is read, so it's quick even on huge discs.

Turn an ISO into a .zip or .tar

For devices and apps that can't open disc images. Folders and long file names come along.

Make a disc for an emulator

CHD for RetroArch, DuckStation, PCSX2 and MAME. CSO or ZSO for PSP and PS2. BIN/CUE with real CD error correction for everything else.

Open game rips: CHD and BIN/CUE

Drop a .chd, a .cue with its .bin files (even one per track, like Redump sets), or a Dreamcast .gdi set. NRG, MDF, CDI, PBP and GameCube or Wii images open too. Browse the files, convert the disc, or save the music as WAV.

Build an ISO from a folder

Drop a folder and get an ISO with the full file names for Windows, Mac and Linux, ready to mount or burn.

Check a download isn't broken

Get the SHA-256, SHA-1, MD5 and SHA-512, then paste the publisher's checksum to compare them.

See if a disc boots, or rename it

Volume label, file count and boot type (BIOS, UEFI or both). Change the label without rebuilding anything.

Remove or add files

Take files out, drop new ones in, and save the result as a new ISO. A bootable disc stays bootable, and the original stays as it was.

Convert a whole stack at once

Drop several ISOs or CHDs and they're converted one after another into the format you pick.

Works with

  • ISO and IMG files using ISO 9660 (with Joliet or Rock Ridge names) or UDF: Windows 10 and 11 installers, Linux downloads, DVD and Blu-ray images
  • Game discs: BIN/CUE in any track layout, CHD versions 3 to 5 (CD, DVD and Dreamcast GD-ROM), .gdi sets, CSO and ZSO, music tracks included
  • Other CD images: ECM, CloneCD (.ccd), Alcohol 120% (.mds/.mdf), Nero (.nrg), DiscJuggler (.cdi) and PS1 games for PSP (EBOOT.PBP)
  • GameCube and Wii: .iso, .wbfs (split ones too), .ciso and .gcz, plus Dolphin's .rvz and .wia for GameCube, with GameCube files listed and saved
  • Original Xbox discs: full dumps and XISOs, with the game's files listed and saved, and a compact XISO made for xemu
  • Mac disk images: .dmg (zlib, bzip2, LZFSE or LZMA), .cdr and .toast, with the files of HFS and HFS+ disks listed and saved
  • .zip, .tar, .tar.gz, .iso, bin/cue, .gdi, .chd, .cso, .zso, .wbfs, .ciso and XISO output of any size
  • Checking a disc against a Redump .dat, track by track, whatever layout it's in
  • Boot records (El Torito) for BIOS, UEFI and hybrid discs: shown in Info, and kept when Edit rebuilds a disc, USB boot code included

Not yet

  • Writing a bootable USB stick. Use Rufus or balenaEtcher for that
  • Wii discs in .rvz or .wia (rebuilding them needs Nintendo's keys), Xbox 360 discs, and listing the files of a Wii disc (they are encrypted) or of an APFS Mac disk

How isoconverter compares with upload-based converters, desktop apps and command-line tools

Questions

Is it the same as chdman createcd?

It holds the same tracks and gets the same SHA-1 as a CHD made with chdman createcd from the same .gdi, so emulators and tools that check it see the same disc.

Which emulators open it?

Flycast, Redream, RetroArch with Flycast, and MAME all open Dreamcast CHD files.

Can I go back to a .gdi later?

Yes. Open the .chd here and pick .gdi to get the tracks back, byte for byte.

Are my files uploaded anywhere?

No. The page reads your files straight from your device inside the browser. There's no server that receives them, and once the page has loaded it keeps working even if you go offline.

Is there a size limit?

No fixed limit. Opening a disc, saving files from it and checking its checksum work at any size, because the file is read a few megabytes at a time. In Chrome and Edge, big results are written straight to your disk. Other browsers build the result in memory first, so there, very large conversions depend on how much memory your device has.

Can it make a bootable USB stick?

No. Writing a disc image to a USB drive safely needs a desktop app. Use Rufus on Windows, or balenaEtcher on Mac, Linux and Windows.

Will a disc I change in Edit still boot?

Yes, from a CD or DVD, in virtual machines, and from a USB stick. Edit keeps the disc's boot records for BIOS and UEFI and points them at the new layout, the way mkisofs and xorriso do. Linux discs made to be written to a USB stick keep that too: their USB boot code and partitions are moved to the new layout. Linux discs also keep their full file names, permissions and links, and Windows installers keep their UDF file system, so you can add an answer file or drivers.

Which disc images can it open?

ISO and IMG files that use ISO 9660 or UDF, which covers Windows 10 and 11 installers, Linux downloads, software discs, and DVD and Blu-ray images. Game discs open too: BIN/CUE (one .bin or one per track), CHD (versions 3, 4 and 5), Dreamcast .gdi sets, CSO and ZSO, plus ECM, CloneCD, Alcohol 120%, Nero, DiscJuggler and PS1 games for PSP (.pbp). GameCube and Wii discs open as .iso, .wbfs, .ciso and .gcz (GameCube also as .rvz and .wia), original Xbox discs as full dumps or XISOs, and Mac disk images as .dmg, .cdr and .toast, with the files of HFS and HFS+ disks listed. Movie discs that are copy-protected open fine, but their video files stay encrypted.

Can it check a dump against Redump?

Yes. Download the .dat for the console from redump.org and add it in Verify. A DVD image is checked whole and a CD track by track, whatever layout it's in: .cue and .bin files, one .bin, .chd, .cso, .rvz and more. Drop several discs to check them all at once. The .dat stays on your device.

Can it turn a CHD into an ISO or BIN/CUE, and back?

Yes. Open the .chd and pick .iso or bin/cue. A CD game comes back as one .bin with its .cue, laid out exactly as MAME's chdman would extract it, music tracks included. It works the other way too: open a BIN/CUE or an ISO and pick .chd. CDs and DVDs (PS2, PSP) are both handled, and the result opens in chdman, RetroArch, DuckStation, PCSX2 and MAME. A Dreamcast GD-ROM works both ways too: .chd to a .gdi set, and a .gdi set to .chd.

Does it work offline, or as an app?

Yes. After your first visit the site opens without a connection. In Chrome and Edge on a computer you can also install it from the address bar, and the installed app can open .iso, .chd and other disc images straight from your desktop.

What does it cost?

Nothing. There's no account and no ads. If it saved you some time, the coffee button in the corner is a way to say thanks.