Extend Audio

This tool makes an audio file longer. You set a target duration, and it reaches that length by repeating and re-stitching parts of the track you already have. It doesn't change the tempo and it doesn't write new melodies, so the longer version uses only the audio you give it.

The part that keeps it natural: it finds the beats and section boundaries first, then adds length at those points. Repeats land on the beat and at section breaks instead of cutting in mid-phrase, so the result sounds like a longer take rather than a track stuck on a loop.

To use it, upload an MP3 or WAV, pick the length you want, and let it find the beats. It places the repeat points at section boundaries, then you preview and export.

Use it when a 2-minute track needs to cover a 5-minute slideshow, or when the background music under a video runs short and you need another minute that doesn't jump.

A practical tip: extend in steps. Going from 2 to 4 minutes usually sounds cleaner than 2 to 10, because there are more natural points to add length without the same section repeating back to back.

If you're wondering whether extending wrecks the audio: it won't, as long as you stay reasonable about how much you add. It can't invent notes that weren't there, but because it cuts on the beat and at section breaks, a moderate extension holds together instead of sounding padded.