Reverse & Loop Audio

Reverse & Loop Audio plays sound backwards and repeats it. Make a reversed cymbal swell or vocal for a track, hunt for hidden messages, create a spooky effect for a video, or turn a short drum bar or ambient sound into a loop of exactly the length you need.

Work on the whole file, or drag two handles on the waveform to pick one part. A selected part can be reversed in place, leaving the rest of the recording as it was, or kept on its own. Then loop it: repeat it a number of times, or fill a length such as 1:00 or 10:00. Ping-pong mode plays it forwards, then backwards, and so on, which loops seamlessly with almost any sound.

Loop points can click when the end and start of a sound don’t meet, so each join can be crossfaded over 10 ms to half a second. Press “Play result” to hear it before saving as MP3, M4A, OGG, WAV or FLAC. It all happens in your browser; nothing is uploaded.

1. Press “Choose a file” or drop an audio or video file on the box. Its waveform appears.
2. Choose “Whole file” or “Selected part”. For a part, drag the handles to the start and end you want, and choose whether to keep the rest of the file around it.
3. Choose Backwards or Forwards, then Play once, Repeat (type how many times) or Fill a length (type a time such as 2:30). Tick Ping-pong or pick a crossfade for the loop point.
4. Press “Play result” to listen, or “Play original” to compare.
5. Pick a format under “Save as” and press the save button (“Save reversed audio” or “Save the loop”), then download.

• Reverse the whole recording, or only a selected part, in place or on its own.
• Draggable start and end handles with keyboard control, and a play button for the selection.
• Repeat 2 to 100 times, or fill an exact length up to an hour; the last repeat ends with a short fade so it doesn’t click.
• Ping-pong loops (forwards, backwards, forwards…) for seamless repeats of almost anything.
• Crossfade at each loop point from 10 ms to 0.5 s, or none.
• Tiny fades where a reversed part meets the untouched sound around it, so the edges don’t click.
• Optional fade in and fade out for the finished file.
• Play the result before saving; save as MP3, M4A, OGG, WAV or FLAC.

• For a reverse swell, select a single cymbal hit or piano chord, keep it on its own, reverse it and add a short fade in.
• Loops of drums sound best with no crossfade or 10 ms when the part starts exactly on a beat; ambient sounds like rain suit 250 ms or more.
• If a loop still bumps, try Ping-pong: each turn starts on the very sample the last one ended on.
• “Fill a length” is handy for background sound under a video: loop a few seconds of room tone to the video’s length.