Copy the resulting .cso file (not the original ISO) into the /ISO/ folder on your PSP’s memory stick. Your Custom Firmware (CFW) like PRO-C or LME will recognize CSO files natively.
The most popular compressed format, natively readable by custom firmware (CFW).
Recommendation: Use for maximum space savings. If the game experiences audio stuttering later, re-compress it at Level 5 or 6 .
Download mscomctl.ocx from an official Microsoft resource, place it into your C:\Windows\SysWOW64\ folder, and register it via the command prompt using the command: regsvr32 mscomctl.ocx .
Click the browse button to select your target .ISO file [1]. psp iso compressor v1 4 zip
Choosing the right compression level prevents games from stuttering during gameplay: Compression Level Load Times Heavy 3D games (e.g., God of War ) Levels 5–7 Most RPGs, puzzle, and racing games Levels 8–9 Simple 2D games and text novels [1] Troubleshooting Common Issues Game Stuttering or Lag
Older custom firmwares struggle with certain CSO formats. Ensure your PSP is updated to modern custom firmware (like 6.61 PRO-C or LME). Alternatively, check your PSP recovery menu and change the to Inferno or M33 Driver . File Corrupt Error
Before we dive deep into the tool, it is important to understand the different file formats it works with. The following table provides a quick overview of the major formats supported by PSP ISO Compressor v1.4.
Click the "..." button to locate your input .ISO file. Copy the resulting
With just a few clicks, users can convert a full-sized ISO file into one of several compressed formats, drastically reducing the storage space required while maintaining compatibility with custom firmware-enabled PSP consoles and emulators like PPSSPP.
Once extracted, install the application and follow these steps:
: Convert multiple games simultaneously to save time [1].
Select CSO as the output format for maximum compatibility with custom firmwares (Pro-C, ME). 4. Compress Recommendation: Use for maximum space savings
Extract compressed formats back into standard ISOs if a game experiences performance issues.
The genuine archive is typically less than 500 KB in size. If you download a 2 MB file, you have likely downloaded a fake installer. Always scan the zip with Windows Defender or Malwarebytes before extracting.
is a legacy utility designed for the PlayStation Portable (PSP) ecosystem to convert bulky game disc images into smaller, storage-efficient formats. It primarily serves to optimize memory usage on standard PSP Memory Sticks. Core Functionality