AI Audio Extender

This tool makes a track longer without an obvious loop or a clumsy repeat. Instead of pasting the same clip end to end, it reads the song's beats and section boundaries and adds bars or repeats whole sections at those points, so a 2-minute file can become 3 or 4 minutes and still flow.

To use it, open the editor in your browser and load an MP3 or WAV by uploading a file. Set the target length you need, longer than the original. The tool finds spots where extra bars or a repeated section sit cleanly, rebuilds the track to that length, and lets you play it back before you export.

People usually extend audio to match something with a fixed running time: a 90-second slideshow that outlasts your clip, a dance or gymnastics routine that needs a few more counts, or a presentation where the background music has to carry to the last slide.

One practical tip: results are best when you add a moderate amount of time rather than doubling a very short clip. The more musical material the track has to draw on, the more natural the added section sounds, so preview and adjust the target before exporting.

The same editor also shortens tracks and trims sections at those same beat points, so you can fit a song to a length in either direction. It is free, runs in your browser, and there is nothing to install.