Set a comfortable pace

Audio Speed Changer

Slow audio down to learn and transcribe, or speed it up to review faster, with an option to keep voices sounding natural.

Add your audio file

Drop it here or choose it from your device.

Up to 750 MB per file · Your original stays unchanged
Private temporary processing Result checked before download No account or watermark

Three simple steps

  1. Add an audio file and listen to it before changing anything
  2. Use the clear everyday settings, or adjust exact values when you need them
  3. Bookify makes a temporary copy, checks the new audio with FFprobe, and deletes the workspace after download

Your file is temporary

Bookify works on an isolated copy, checks the new audio with FFprobe, and deletes the temporary workspace after the result reaches your browser. Your original is never changed.