If you are converting Sega Dreamcast games that use the .gdi format, use this variation instead:
To compress a single game (for example, a .cue file and its matching .bin files), use this command: chdman createcd -i "GameName.cue" -o "GameName.chd" Use code with caution.
If using a command-line version, look for scripts that allow you to "compress all" so you don't have to do them one by one. Stop wasting gigabytes on empty data.
This guide will focus on using CHDMAN within the Termux environment, as it is the most flexible and powerful method for local conversion on Android.
To run a desktop-grade command-line utility on Android, you need a few free tools from the Google Play Store or trusted open-source repositories: chdman android
Leading Android emulators—including DuckStation (PS1), AetherSX2 / Net profit (PS2), Yaba Sanshiro (Sega Saturn), Flycast (Dreamcast), and various RetroArch cores—fully support the .chd format out of the box. How to Run CHDMAN on Android
: Download the latest version from F-Droid (the Play Store version is outdated).
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CHDMAN stands for . It's a utility from the MAME (Multiple Arcade Machine Emulator) project, designed to convert unwieldy disc images (like .bin / .cue , .iso , and .gdi ) into a single, highly compressed CHD file. This is a lossless format, meaning no game data or audio quality is sacrificed, but file sizes can be reduced by 30% to 50% or more. If you are converting Sega Dreamcast games that use the
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Android aggressively kills background processes. chdman ’s large working set (e.g., for a 4 GB DVD image) can trigger the Low Memory Killer (LMK). Even foreground apps have limited heap; the NDK’s malloc may fail for allocations > 512 MB on older devices.
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Quick conversions without downloading additional software. This guide will focus on using CHDMAN within
: No game audio, video, or data is degraded during compression.
chdman createdvd -i "game.gdi" -o "game.chd"
This command automatically names each output file by replacing the .cue extension with .chd , saving you from typing each game name individually.