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Audio Speed Changer

Speed audio up or slow it down between 0.5x and 2.5x, with the option to keep voices at their natural pitch. Runs entirely in your browser.

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Drop an audio file here or click to browse

Lectures, language practice, voice memos, music. Nothing is uploaded.

Keeping the pitch uses an overlap-add time-stretch: short windows of audio are overlapped so the recording becomes longer or shorter while its frequencies stay put. It is tuned for speech and practice tracks; dense music at extreme settings can show a slight flanging or reverb-like edge. Turning pitch preservation off uses plain resampling, which is cleaner but shifts the pitch with the speed.

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What Is Audio Speed Changer?

The Audio Speed Changer stretches or compresses audio between 0.5x and 2.5x. With pitch preservation on, an overlap-add time-stretch keeps voices at their natural pitch while the recording becomes longer or shorter; turning it off uses plain resampling, which is cleaner but moves the pitch with the speed, like a tape. The result is written as MP3 or WAV in the browser.

Who Uses the Audio Speed Changer?

Students slow a lecture to 0.75x for note-taking, language learners speed up listening practice once they know the passage, and anyone reviewing a long meeting plays it back at 1.5x.

How to Use the Audio Speed Changer

  1. Load the recording and drag the speed slider to the rate you want.
  2. Leave pitch preservation on for speech, or turn it off for the tape effect.
  3. Apply the change, compare the preview and download the MP3 or WAV.

Why Choose Our Audio Speed Changer?

  • Pitch-preserving mode keeps lectures and language practice natural
  • Tape mode gives the simpler resampled sound for music edits
  • MP3 or WAV export without a desktop editor or plugin

Try the Audio Speed Changer above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.