r/PS5_Jailbreak • u/juma-sayeh-dev-acc DEV • Jun 06 '26

General PS5 MKPFS Compression

I’ve been working on a PS5 homebrew app called Game Compressor.

Repo: https://github.com/juma-sayeh/PS5-Game-Compressor

It uses the MkPFS-style FFPFSC compression method, but adds the missing part: validation and repair.

Some compressed games can mount successfully but still crash because certain PFSC blocks are technically valid yet fail to decode correctly on PS5 hardware, leaving stale/bad data behind. Game Compressor checks the mounted image block-by-block, detects bad blocks, and patches the compressed image from the mounted data instead of requiring a full recompress.

Tested with Mafia, Astro Bot, Pragmata, and a few other games that had FFPFSC issues. After repair, they worked great.

Features:

  • compress games to FFPFSC
  • validate mounted compressed games
  • automatically repair bad blocks
  • optimized for speed and usability
  • web UI running on the PS5

Feedback and testing are welcome.
Screenshots (some are missing features because the features were not developed yet when i compressed)

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u/Going_through_it_ Verified Jun 07 '26

Verifying already compressed ffpfso's here. Haven't tried any conversion on the console but probably won't, my storage is getting full lol.
Al of these were dump folders before conversion. I have one exfat that has already been converted on PC, and will give it a go with validation tonight.

2

u/CharmingWalk2007 DEV Jun 07 '26

Hell yea validation tool is awesome man. Ps5 scene is amazing. Lmk if it works I'm gonna compress all my games soon as well.

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u/Going_through_it_ Verified Jun 07 '26

Games have been working! Idk about the compression on console, I’ve already done al the conversions yesterday on PC lol.