Audio Looper

How to loop audio

Three steps, in your browser.

1. 1

   Drop the file

   MP3, M4A from an iPhone, WAV, FLAC and other common formats up to 100 MB and 30 minutes. The page draws the waveform with the whole file selected as the loop.

2. 2

   Pick the section and how long

   Drag the handles or type start and end times to loop one part, and press Play loop to hear it repeat. Then choose a number of repetitions or a target length, a crossfade for the seams and, if you like, a fade-out at the end.

3. 3

   Save and download

   Press Loop and save. The loop is written as one file, an MP3 at the bitrate you choose or a 16-bit WAV, with a player to check it before you download.

Seamless loops

• Crossfade at the seams

  Each pass ends by blending into the start of the next, over 0 to 500 milliseconds. The blend keeps the loudness steady (the two volumes always add up to the same power), so the join neither clicks nor dips. 20 to 100 ms suits most music and ambience.

• Choosing the section

  A loop sounds smoothest when the section ends where it starts: on the beat for music, in a pause for speech, on a steady stretch for ambience. Use Play loop to hear the seam, move a handle a little, and listen again.

• Fade out at the end

  With a target length the last pass is cut wherever the time runs out. Add a fade-out of 1 to 5 seconds and the loop ends gently instead of stopping mid-note.

• How long it can run

  Up to 100 repetitions and 60 minutes of output. The whole loop is built in your browser's memory, which is why there is a limit; the page tells you when it has shortened your request.

What people loop

• A music bed for a video or podcast intro

  Take an eight-bar section of a track you have the rights to use and loop it to the exact length of your intro, with a fade-out under the last words.

• Practising a passage or a phrase

  Select the guitar solo, the tricky bar or a sentence in the language you are learning and press Play loop: it repeats until you stop it. Save it as a file to practise on the go.

• Hold music and waiting rooms

  Loop a short piece to fill ten minutes or an hour so the phone system or the speaker in the waiting room does not restart the track every few seconds.

• Ambience and white noise

  Rain, café chatter or room tone for a scene, a study session or sleep: loop a clean minute to an hour with a long crossfade so the repeat is hard to hear.

How long the loop runs

A 10-second section, repeated. Each crossfade overlaps two passes, so it shortens the loop by its own length at every seam.