If you have a modded 3DS running Luma3DS homebrew, you can compress and trim games directly on the console using the GodMode9 tool.
There are several benefits to downloading and playing highly compressed 3DS games:
Downloading pre-compressed files from untrusted websites puts your devices at risk for malware and viruses. The safest, most efficient route is to take standard clean ROMs of games you own and compress them yourself using free, lightweight desktop utilities. Method 1: Using 3DS ROM Tool (Trimming) 3ds games highly compressed
While highly compressed 3DS games may seem like a convenient and space-saving solution, there are some risks and precautions to be aware of:
Avoid files labeled as "Ultra Compressed 50MB" for games that are originally 4GB. True game data (like audio, textures, and video cutscenes) cannot be compressed that heavily without destroying the quality of the game or breaking it entirely. If a file size seems too good to be true, it likely contains corrupted data or malware. Stick to trusted trimming tools to compress your own files. If you want to optimize your console further, let me know: If you have a modded 3DS running Luma3DS
Place the chdman.exe file in the same folder as your 3DS ROMs.
For users looking to save space on an SD card or for emulation, these are the standard methods used by the community: Method 1: Using 3DS ROM Tool (Trimming) While
: Most highly compressed 3DS games found online are packed in .7z or .rar formats. You'll need to extract these using 7-Zip before they'll work with your emulator or console.
A: No. Citra cannot read .7z files. You must extract the ROM first.
Compressing your library removes this useless data. It frees up gigabytes of space on your SD card or hard drive while keeping the gameplay 100% identical. 3DS File Formats Explained
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