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 3 hours

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.

No subscriptions, nothing renews

Convert once, or keep credits ready

Go unlimited with a one-time pass, or keep permanent credits ready: standard conversions use 10 credits, RVZ uses 20. No subscriptions, nothing renews.

30 days unlimited

$14.99

For this file and every one after it

Unlimited conversions in every format (fair use: 20 a day)
One-time payment, never renews
Convert RVZ files up to 10 GB

1 year unlimited

Best value

$49.00

Lowest price: about $4.08 a month

Unlimited conversions in every format (fair use: 20 a day)
One-time payment, never renews
Convert RVZ files up to 10 GB

Permanent credit packs

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