AI Song Extender

If a song ends before your video or routine does, this tool stretches it to the exact length you set. Instead of looping the whole track back to the start, it detects the beats and section boundaries in your audio and repeats internal sections, so the added time joins on natural musical seams rather than an obvious restart or a hard splice.

Open the page and upload an audio file (MP3 or WAV). The track is analyzed in your browser, then you type a target length longer than the original. The tool picks beat-aligned points to repeat, and you can preview the full result before exporting the extended file.

This helps when a 2:30 backing track needs to reach 3:15 to cover a finished edit, or when a song runs out before a dance, speech, or presentation is done. Because you set an exact duration, you match a fixed runtime instead of trimming your video to fit the music.

One honest limit: extending works best within a reasonable range. Going from 3:00 to about 4:00 leaves room to repeat sections cleanly, while doubling a short clip forces heavy internal repetition and sounds more obviously looped.

Does it sound looped? Not in the usual way. Joins land on detected beats and section starts, so the tempo stays steady across them. Preview first, and if one join feels off, nudge the target length a few seconds and export again. Nothing installs and nothing costs money.