Is ISO to CHD conversion lossless?

Yes. CHD uses lossless compression for disc data, so supported images can be restored without losing sector data.

Why convert ISO to CHD?

CHD usually uses less storage and includes checksums while remaining directly usable in many emulators.

Which ISO images are supported?

The current converter targets CD-based data-track ISO images up to 1.5 GB.

Do I need to install chdman?

No. chdman runs inside the isolated conversion container on the server.

Files up to 200 MB convert free. Larger images display their exact credit or one-time price before download.

Lossless disc image compression

ISO to CHD converter online

Compress an ISO disc image into the CHD format used by emulators. The conversion is lossless, private, and requires no local installation.

No local tools to installIsolated processingAuto-delete after 1 hour

RVZ → ISO BIN/CUE → ISO ISO → CHD CHD → ISO

Lossless compression for emulators

Reduce disc-image storage without discarding data

CHD is a compressed, checksummed format from the MAME project. This converter runs chdman in an isolated container and returns the resulting .chd file.

Lossless output

The source disc data can be restored from CHD without lossy recompression.

Emulator-friendly format

CHD is supported by many preservation-focused emulators and front ends.

No chdman setup

The server handles the conversion environment, so no command-line installation is needed.

Credits that fit real usage

Convert once, or keep credits ready

Standard conversions use 10 credits. RVZ conversions use 20. Subscribe for a fresh monthly allowance, then add permanent credits whenever you need more.

Annual

Save 58%

$44.99/ year

The allowance shown above resets every month. Subscription credits do not roll over.

400

credits each month

4,800

credits per billing term

Subscription balance is spent first
Convert RVZ files up to 10 GB
Cancel renewal anytime from your billing portal

Permanent credit packs

One-time purchase. These credits never expire and stay in your account.

Best value

Top-up

150 credits

$7.99

About $0.05 per credit.