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CSO ISO
File conversion

Convert CSO to ISO

QUICK ANSWER
Is it possible to convert CSO to ISO?
Yes - CSO converts to ISO.

The core conversion - decompress the CSO back to a standard ISO disc image. maxcso (free, cross-platform) does it: 'maxcso --decompress game.cso'. The output is a normal ISO you can mount, burn or run in any PSP tool. This is a lossless round-trip.

1 programs
Also to ISO: BIN · MDX · FCD

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert CSO to ISO

Converting a .CSO file to .ISO lets you open the content in software that prefers the .ISO format, though some details may change compared with the original. The programs listed below open .CSO files and can save or export them to .ISO (or a closely related format).

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

Programs that convert CSO

Yet Another CSO Compressor

About these formats

.CSO CISO Compressed ISO Image

A CSO file is a compressed PSP (or PS2) game disc image - an ISO with each block DEFLATE-compressed to save space on a memory stick. Open it directly in the PPSSPP emulator…

Open .CSO details →
.ISO ISO disc image (ISO 9660 / UDF)

An ISO file is a sector-by-sector copy of an optical disc (CD, DVD, or Blu-ray) stored as a single file. On Windows 8 and later, right-click it and choose Mount - no software needed. To…

Open .ISO details →