If you already use RetroArch, you might have CHDMAN without knowing it.
Step 1: Open RetroArch.
Step 2: Go to Main Menu → Online Updater → Update CHD Tools.
Step 3: RetroArch will automatically download and place chdman.exe in your RetroArch\system directory.
This is the easiest GUI-based method for non-coders.
Assumption: You are using Windows 10 or later, and you have a stable internet connection. download chdman.exe
Save the ZIP File
Verify the Signature (Optional but Recommended)
Extract the Archive
Locate chdman.exe
That’s it—chdman.exe is now on your system and ready to use.
To acquire the tool safely:
CHDMAN is open-source (BSD license). However, you should only compress game images you have legally dumped from your own physical discs. Distributing CHD files of copyrighted games is illegal. This guide is for preserving your personal collection.
When downloading ROMs or disk images, it is standard practice to verify the file hash. chdman outputs SHA1 hashes which can be compared against known databases (such as Redump.org or TOSEC) to ensure data integrity.
Example Workflow for Archivists:
Do not delete your original ISOs until you test the CHD. Here is the compatibility shortlist: