ISO Compressor for Windows

Overview

ISO Compressor is a free Windows utility built to shrink ISO disc images into the CSO (CISO) format. It’s aimed mostly at console gamers who want to reduce the storage footprint of their game images while keeping them usable from portable media.

Core functions

• Converts standard ISO files into compressed CSO/CISO images to save disk space.
• Restores CSO images back to their original ISO form when needed.
• Lets users load and run compressed games directly from removable drives such as memory sticks.

Compatible systems and limitations

• Wii and PSP titles are supported, making the tool convenient for handheld and older console collections.
• Full PlayStation disc images are handled reliably for typical use cases.
• Some PlayStation 2 ISOs can also be compressed, though very large PS2 images may not be compatible or could exceed practical limits.

Recommended alternative

• SHAREit (free): a useful substitute for players who want straightforward file transfers and simple library management across devices, particularly handy for PSP and Wii users.

Why gamers find it useful

• Saves valuable storage by shrinking large ISO archives.
• Makes it easier to carry and manage multiple game images on limited-capacity media.
• Provides both compression and decompression so libraries remain flexible.

Practical notes

• The program runs on Windows only; verify compatibility with your OS version before installing.
• When handling critical game files, keep backups in case conversion or decompression is interrupted.