Song Extender AI

"AI" here means the analysis, not the music. Audjust listens for the song's beats and section boundaries, then repeats and reorders those existing sections to reach the length you ask for. It does not generate new notes or instruments, so the longer version still sounds like the original, with the joins landing on the beat instead of cutting mid-phrase.

To use it: upload an MP3 or WAV, type the length you want, and let it rebuild the track to that target. The timeline shows you where the looped joins fall. Drag a cut point to a different spot if one bugs you, then export. No signup, nothing to install, free.

A common case: a track ends at 2:40 but your slideshow runs 4:00. Rather than letting the audio stop early or restarting from the top, you stretch it to 4:00 so it carries to the last frame. The same goes for a routine choreographed to a fixed count that needs an extra 30 seconds of the same section.

Because it reuses real parts of the song, it works best when you add a section or two, not when you stretch a 30-second clip into five minutes. The closer your target is to the original length, the less you'll hear the seams.

If you'd rather make a song shorter, the same editor trims and reflows it down to a target time as well.