Open your emulator (e.g., DuckStation for PS1 or PCSX2 for PS2).
Before you begin, you need a specific tool created by the MAME development team.
CHD, however, was designed specifically for game and disc preservation. It compresses by splitting the data into small, independent blocks, unlocking key advantages:
Originally developed by the MAME team for hard drive and CD-ROM compression, CHD has become the gold standard for compressing PS1, Sega CD, TurboGrafx-CD, and Dreamcast games. But what if you have a library full of .zip files (each containing a .bin / .cue or .iso pair) and want to convert them to .chd ?
If you have 50 games, don't type this 50 times. Use the batch method . Convert Zip To Chd
So open that folder full of dusty ZIPs, download chdman , and start converting. Your hard drive—and your future self—will thank you.
Converting a ZIP file to CHD (Compressed Hunks of Data) is a two-step process: you must first extract the contents of the ZIP archive—typically game disc images like .bin , .cue , or .iso —and then use a specialized compression tool to create the .chd file. This format is highly popular in emulation because it provides lossless compression, saving up to 70% of storage space while remaining directly readable by most modern emulators like RetroArch, PCSX2, and DuckStation.
A PS1 game in a ZIP file often contains one .cue file and dozens of .bin track files. CHD merges all of these into a single, clean .chd file. No more cluttered folders.
Open the NamDHC application on your PC. You will see a clean, simple window with configuration options. 2. Configure Your Settings Open your emulator (e
A command prompt window will open, and CHDMAN will begin processing every disc image in the folder sequentially.
Disc games inside a ZIP file often consist of multiple .bin tracks and a .cue sheet. Converting to CHD merges all of these loose files into a single, clean .chd file per game. Supported Systems and Emulators
Which or frontend (like RetroArch, DuckStation, EmulationStation) do you plan to use?
To perform this conversion, you need command-line tools. Don't worry—it isn't hacking; it is just typing. It compresses by splitting the data into small,
Converting your library from ZIP to CHD is one of the best "quality of life" upgrades you can give your emulation setup. It saves space, declutters your folders, and ensures maximum compatibility with modern emulators.
To save space without sacrificing performance, you need to convert your library to . This guide will walk you through exactly why and how to convert your ZIP files to CHD. What is a CHD File?
Mac and Linux users can easily use CHDMAN through their terminal terminals using package managers. For Mac Users (Homebrew) Open your Terminal. Install the MAME tools by typing: brew install mame