Extend Audio Length

This page is also available in other languages: Deutsch, 한국어, 日本語, Español, Português (Brasil), Français

This tool makes a piece of audio longer. You set a target duration, and it reaches that length by repeating natural sections from inside the song rather than looping the whole thing or pasting a crude copy at the end. It runs in your browser, it's free, and there's no signup or install.

It works because it detects beats and section boundaries first. When it adds length, the new material starts and ends on a real musical edge, so the result sounds like one continuous track instead of a clip played twice.

To use it: open the tool and load an MP3 or WAV by uploading a file. Type the longer length you want, or drag the end of the track out to that point. Preview the spot where time is added, then export the extended file.

A common reason to do this is a video or reel that runs longer than the song you picked, so the audio needs to fill the whole thing with no silence at the end. It also helps when a short intro or background loop has to cover a full presentation or a timed segment.

One thing to know: this works best when there's a repeatable section to draw from, so a track with a clear groove extends more cleanly than a short sound effect or a spoken clip with no rhythm.

People often ask whether extending lowers quality. It doesn't slow down or pitch-shift the audio; it inserts existing sections at their original speed, so the sound stays intact.