Making a song shorter usually means cutting time out of the middle, not just chopping off the end. The hard part is doing it without a jarring jump where the cut lands. Audjust reads the track's beats and section boundaries, so when it removes length the two sides still line up on the rhythm and play as one continuous piece.
Here's how. Open the song in the editor by uploading an MP3 or WAV. The track loads as a waveform with its beats marked. Type the exact length you want, or drag to select a section and remove it, and the editor closes the gap on the nearest beat. Play back the join to check it, then export the shorter file.
This helps when a song runs longer than the video or reel you're scoring and it has to land on an exact second count. It also works for trimming a long intro or a repeated outro so the track gets to the point faster for a performance or a slideshow.
One tip: cut on a section change, like a verse going into a chorus or the end of a phrase, rather than mid-phrase. It sounds cleaner because the music was already meant to shift there, and the beat detection has a clear boundary to work with.
People often ask whether shortening a song hurts the audio quality. It doesn't. You're not re-recording or speeding anything up, just removing a stretch of time, so the parts you keep sound exactly as they did before.