A music repeater makes a track run longer by repeating it, so a short song covers the time you actually need. Audjust does this in your browser for free, with no signup or install, and it reads common files like MP3 and WAV.
It doesn't just paste the song end to end. It detects the beats and section boundaries first, then repeats from those points so the track folds back without an obvious jump or a hard cut. You set the length you want and Audjust adds repeats to reach it.
To use it: upload your file, wait for the analysis to finish, then type a target duration or drag the timeline to extend it. Audjust fills the time, you preview, and you export.
This helps when a song is shorter than the clip it has to cover. A two-minute track can fill a five-minute slideshow, a workout segment, a stream background, or a looping display, all from one file instead of stitching copies by hand.
Songs with a steady beat repeat most cleanly. A track with a slow fade-out or a one-off ending may need you to move the loop point so the repeat starts before that part.
The common worry is whether the loop sounds choppy. It lands on a beat rather than wherever the file happens to stop, so it usually doesn't. Still, preview before you export, and nudge the loop point if a transition isn't clean.