Audio Extender MP3

This page is for when an MP3 is too short and you need it longer. The tool extends a track to a target length by repeating sections at the song's own beats and section boundaries, so the added time blends in instead of restarting mid-bar. Free, runs in your browser, no signup or install.

Upload your MP3. The editor analyzes the audio and marks natural beat and section points. Set the length you want, and it repeats suitable sections at those points to reach it. Preview, move where the added part sits if needed, then export.

A common case: your background music is 1:30 but your video runs 2:20, so you extend the MP3 to cover the whole edit without a hard stop. Or you stretch a short loop to fill a presentation, gym set, or stream segment that needs to run longer.

One thing to know: this works best when the song has a repeatable middle section. A track with one short, unique idea has less material to draw from, so put your insertion point inside a steady part rather than over a fill or a vocal phrase.

A question people ask: does it use AI to invent new music? No. It doesn't generate new sound. It rearranges and repeats what's already in your file at musical boundaries, which is why the result still sounds like the original recording.

The same editor also shortens and trims, so you can adjust length in either direction from one place.