Free online DAX to ISO converter

Source format: DAX

DAX is a compressed disk image format, most commonly associated with PlayStation Portable (PSP) game backups. It is essentially a variant of a disc image that stores the contents of a UMD in a compressed form to save space. DAX files are typically used by PSP enthusiasts, homebrew users, and collectors who want to archive or distribute game images more efficiently than with an uncompressed image.

DAX is not as widely supported as standard image formats, so it is mainly encountered in older PSP-related workflows and specialized tools.

Target format: ISO

ISO is a standard optical disc image format that stores an exact sector-by-sector copy of a disc. It is one of the most widely supported image formats and can be opened, mounted, burned, or extracted by many operating systems and utilities. Compared with DAX, ISO offers much broader compatibility with emulators, disc tools, and archive software.

ISO files are commonly used for game backups, software distribution, and disc archiving because they are simple, well documented, and supported by many applications.

How to perform the conversion

The most reliable way to convert DAX to ISO is to use a PSP image utility that understands DAX compression and can export a standard ISO. One commonly used desktop tool is UMDGen, which can open PSP disc images and save them in ISO form.

1. Install and launch a compatible PSP image tool such as UMDGen.
2. Open the .dax file in the program.
3. Wait for the image contents to load and verify that the disc structure is recognized correctly.
4. Use File → Save As or the equivalent export option.
5. Choose ISO as the output format and save the new file with a .iso extension.

If your tool does not directly export ISO, look for an option to extract or rebuild the image into a standard disc image. Some PSP utilities can also convert DAX to ISO through command-line workflows, but the exact command depends on the specific program you use.

You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality, compatibility, or limitations

The conversion from DAX to ISO is usually lossless in terms of disc data: the ISO should contain the same game or disc contents as the original image, just without DAX compression. However, the resulting file will usually be larger because ISO is uncompressed.

Compatibility is the main reason to convert. Many modern tools and emulators handle ISO more reliably than DAX, while some may not support DAX at all. If the source DAX file is damaged or was created from an incomplete dump, the converted ISO may also be unusable.

Keep in mind that DAX is a niche format, so support varies by software version. If one tool fails to open the file, try another PSP image utility before assuming the file is corrupted.