Extend Audio Online

This tool extends audio online by making a track longer to reach a target length. You set the duration you need, and it detects natural beats and section boundaries so the added time blends in instead of sounding like an obvious loop. It runs in your browser, works with common files like MP3 and WAV, and is free.

To use it, open the editor and upload your audio file. Set the new length you want. The tool repeats and re-stitches parts of your track at musical points, then plays back the result so you can hear it. Adjust the length if you need to, then export.

One common case: your background music runs 2:10 but your video timeline needs 3:00, so you make the track longer to cover the whole edit without a hard cut. Another: a stage or dance routine has to run an exact number of minutes, and the music needs to match.

A practical tip: aim for a target that adds whole musical phrases rather than a few odd seconds, and listen to the points where sections join to confirm the joins sound clean.

The question most people have is whether this creates new music. It does not. It reuses the audio that is already there, stitched together at beats and section breaks, so the extended version sounds like the original song running longer.