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CSO DAX
File conversion

Convert CSO to DAX

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Is it possible to convert CSO to DAX?
Yes - CSO converts to DAX.

DAX is an older, separate PSP compression format. Conversion goes via ISO: decompress CSO→ISO with maxcso, then make a DAX with a DAX-capable PSP tool. Rarely needed today - PPSSPP reads CSO directly.

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert CSO to DAX

Converting a .CSO file to .DAX lets you open the content in software that prefers the .DAX format, though some details may change compared with the original. The programs listed below open .CSO files and can save or export them to .DAX (or a closely related format). One of them is PSP ISO Compressor: PSP ISO Compressor is a tool which was designed for compression of disc images for PlayStation Portable. Its main function is to convert ISO files into CSO….

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

PSP ISO 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 →
.DAX Compressed CD image file

A .DAX file is associated with Compressed CD image, a disk image file.

Open .DAX details →