Make MP3 Longer

If you need an MP3 to run longer than it actually is, this tool extends the track to a target duration by repeating its own sections instead of adding silence or a crude copy. It finds the beats and section boundaries in your song, so the extra length falls on a downbeat and folds back into the music rather than restarting it. It runs in your browser, it's free, and there's no signup or install.

Load your MP3 (or WAV) by uploading a file. Set the length you want the track to reach. The editor picks repeat points that land on the beat and previews the result before you commit. When the timing sounds right, export the longer file.

A common reason to do this: your background music ends before your video, slideshow, or reel does, and you want it to fill the whole runtime. It also helps for a looping track at an event or performance, where a two-minute song needs to cover five minutes without a jarring jump back to the start.

Worth knowing: this reuses parts of the audio you give it, so the result reads as the same song playing longer, not as new music written to fill the gap. Pick a target close to a clean multiple of a verse or chorus and the repeats sit more naturally.

Can you make an MP3 longer without it sounding repetitive? Mostly, within reason. Adding a little length is nearly invisible; doubling a short clip will sound like a loop no matter where the cut falls, because the source is finite.