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Change Audio Speed and Pitch

Speed up or slow down a song or voice note without changing its pitch, or raise or lower the pitch by semitones without changing its speed. Listen before you save. Nothing is uploaded.

Private · on device. Runs in your browser: your file is not uploaded. No sign-up.

MP3, M4A, WAV, OGG, FLAC or a video's sound

How to change the speed or pitch of audio

  1. Choose a song, voice note or video.
  2. Set the speed, the pitch, or both.
  3. Make a 10-second preview to hear it, then save it as MP3, M4A or WAV.

To keep only part of it, use the audio cutter. Too quiet? Use the volume booster.

The engine behind this tool

Video and sound are processed by FFmpeg, the open-source engine behind most of the world's video software, compiled to run inside your browser as ffmpeg.wasm. It is downloaded from this site (about 31 MB) the first time you use a video or audio tool, and your browser keeps it for next time. FFmpeg and ffmpeg.wasm are free software, licensed under the GNU General Public License version 2 or later; their source code is at github.com/ffmpegwasm/ffmpeg.wasm.

Frequently asked questions

Can I slow down a song without making it sound deeper?

Yes. Change only the speed and leave the pitch at "original pitch": the song plays slower in the same key.

How do I change the key of a song?

Move the pitch by semitones: one semitone is one piano key, 12 is an octave. +2 moves a song from C to D, for example. The speed stays the same.

Is my file uploaded?

No. The sound is processed on your own device by FFmpeg running in this browser tab.

Why does a big change sound a bit metallic?

Changing pitch or speed on its own means stretching sound in time, and large changes leave small artefacts in every tool that does it. A few semitones, or 0.8× to 1.25×, sounds natural.

Can I use the sound of a video?

Yes. Choose the video file: its sound is used and saved as MP3, M4A or WAV.