ALOOPER is an online seamless loop editor with high-level control to make audio loops.

To start, drag and drop your audio file into this window, or click the "load button".

Supported audio file formats: mp3, wav, aiff, ogg.

The View

Once loaded, you'll see three layers of visualization:

  • The top layer shows the wave form for the entire audio file.
  • The middle layer is where you define the "in" and "out" parts of the loop.
  • The bottom layer is split in half, and provides a super zoomed in view of how the end and beginning meet. The right side shows the beginning, and the left the ending. The middle is the "seam".

Support this project?
Download from the Mac App Store ($1.00 USD)


Use the mouse wheel to zoom in/out. Hold SHIFT whilst zooming to visually increase the amplitude.

On the bottom layer, drag the left (pink) or right (blue) zone to align the wave-forms so the "ups" and "downs" align across the seam.

Ideally, you'll want a "zero-crossing" on the seam, so both the end and the beginning amplitudes are zero.

The micro fade zone can be resized to force the seam to "push" the beginning and end down to zero right at the seam, but it's best to first manually align the begin and end positions so they both are as close to zero and maintain a relatively consistant pattern flowing from the end to the begining.

Finding an area to loop

(bigger view)

Quick loop with cross fade

(bigger view)

Removing pops (forcing zero crossing)

(bigger view)

Release Notes

v1.0.2 - 2021-10-24 - Added padding left/right. Drop new file refreshes existing waveforms. Many other changes (prepped for Mac App store distrubution).
v0.021 - 2021-6-22 - Added spacebar toggle play/pause.
v0.019 - 2021-6-20 - Fixed export for sources with more than 2 channels.
v0.017 - 2021-4-23 - Initial release.