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Audio Speed and Pitch Changer

Change speed with a live preview, or shift pitch with a short ffmpeg clip.

Speed previews with the player playback rate. Pitch uses a short local ffmpeg clip. Export applies atempo and pitch filters to the full file.

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Status

What Audio Speed and Pitch Changer does

Audio Speed and Pitch Changer changes playback speed with a live player preview, and shifts pitch (with or without speed) using local ffmpeg.

Speed preview uses the browser playback rate. Pitch previews a short clip after you run Preview pitch clip, because pitch needs ffmpeg.

How to use it

  1. Choose an audio file.
  2. Set Speed for a live playback-rate preview.
  3. Set Pitch in semitones, then Preview pitch clip if you want to hear it.
  4. Choose MP3 or WAV and Apply and export for the full file.

Formats and limits

  • Opens common audio files the browser can decode.
  • Exports MP3 or WAV.

Settings explained

Speed
Tempo multiplier (0.25x to 4x). Live preview uses playbackRate.
Pitch
Semitone shift (-12 to +12) without changing duration on export.

Privacy

Processing stays in this tab. Nothing is uploaded.

FAQ

Why does speed preview also change pitch?

The live player playback rate changes rate and pitch together. Export uses atempo so speed changes keep pitch, and pitch uses asetrate with tempo compensation.

Related tools

All processing runs locally in your browser. This tool is provided as-is without warranty. Keep backups of your original files before processing.

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