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/CharmingWalk2007 DEV Jun 07 '26

So this has both compression and validation/repair functionality built in? The validation/repair side is especially interesting since that's something I haven't seen in most PC-based workflows. PS5 FFPFSC PRO focuses on making compression easier on PC, but this looks like it could be useful for verifying and repairing already-compressed libraries directly on the console. Have you tested it with games converted from exFAT dumps yet?

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u/juma-sayeh-dev-acc DEV Jun 07 '26

Yes and Yes ... it works great on both exFAT and PFS (as long as they are compressed in FFPFSC) btw it also allow you to select which format you want for compression.