MP3 Extender

This MP3 extender makes a track play longer without generating any new music. It repeats and rejoins parts of the audio you already have, cutting on the beat so the longer file sounds like one continuous song instead of an obvious loop or a copy-paste.

To use it, open the editor and upload your MP3 (WAV works too). Set the length you want the file to reach. The tool finds the beats and section boundaries, builds the longer version, and lets you preview it before downloading.

It helps when a track is too short for what it has to cover: a 90-second song stretched under a three-minute slideshow, a short clip kept playing through a full gym set, or background audio that has to last the length of a stream or event.

One thing worth knowing: extending works best when you add a few repeats of whole sections rather than forcing a tiny clip to loop many times. A song with a clear verse or chorus gives the tool more material to rejoin cleanly, so the added time is harder to spot.

Because it rearranges your own audio instead of inventing new parts, the result keeps the original instruments, vocals, and mix. It will not write a new bridge or solo; it relines the existing recording to fill the time you set.

Everything runs in your browser. It is free, there is no account, and nothing to install before you start.