Convert GSM to AU — lossless, so expect larger files
Free and unlimited, and nothing is uploaded: it all runs in your own browser. Open Audio Converter
What changes when you convert GSM to AU
- GSM audio is lossy and AU audio is lossless: converting cannot restore detail the source already discarded, and the AU audio file will usually be larger than the original.
How to convert GSM to AU
- Add your GSM file — drag it onto the page or choose it. It stays on your device.
- Pick AU as the output format.
- Press convert and download the result — individually or as one ZIP.
Questions
How do I convert GSM to AU for free?
Add your GSM file on this site, choose AU, and press convert. The whole conversion runs in your own browser — nothing is uploaded — and the AU file downloads straight from your device.
Will converting GSM to AU lose quality?
GSM audio is lossy and AU audio is lossless: converting cannot restore detail the source already discarded, and the AU audio file will usually be larger than the original.
Does AU keep everything GSM supports?
Yes within the format’s own limits — pixels, timing and structure survive the conversion.