Check a file

Every file Mutemix saves (WAV, M4A and MP4) contains a small invisible note stating that a sound-splitting model separated the song into parts. The note does not change the sound and contains no personal data.

Check it here

Choose a file (WAV, M4A or MP4):

The file is read only on your own device. It is not uploaded or sent anywhere.

What the note says

Comment: "AI-manipulated audio. Parts separated by an AI model in Mutemix", followed by the app version.
Encoding tool: Mutemix and the app version.
A standard code (the IPTC "digital source type"): compositeWithTrainedAlgorithmicMedia, which some tools display as "Edited using Generative AI".

Check it on your computer

Windows: right-click the file > Properties > Details, and look at "Comments".
Mac (M4A files): select the file and choose Get Info.
Any computer: the free tools MediaInfo and ExifTool show the comment and the standard code.

Some M4A and MP4 files store the note only in their XMP metadata, which Windows and Mac do not show. For these files, use the checker above, MediaInfo or ExifTool.

If there is no note

Many websites and apps remove file metadata when a file is uploaded, sent or converted, and anyone with the right tool can add or remove the note. A missing note therefore does not prove that a file was not made with Mutemix.