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Audio Speed Changer

Speed an audio clip up or slow it down and download the resampled result.

Change audio speed

Original length: —
New length: —
Pitch: not loaded
Speed is changed by resampling the PCM data, so the pitch shifts with the tempo; export is 16-bit WAV.

How to use the Audio Speed Changer

  1. Choose an audio file to load it into the waveform view.
  2. Move the speed slider to pick a rate between a quarter and three times.
  3. Click Apply and download WAV to save the faster or slower clip.

Features

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Frequently Asked Questions

Common questions about the free online audio speed changer.

Choose a file, set the speed slider, then click Apply and download WAV to save the faster or slower clip.
Yes. This tool resamples the audio, so speeding it up raises the pitch and slowing it down lowers it.
Not in the browser without extra libraries. Pitch preserving time stretching would need a JavaScript DSP library.
From a quarter speed up to three times speed, which covers most transcription and music practice needs.
The new length is the original duration divided by the speed, so double speed gives a file half as long.
Resampling skips or repeats samples through interpolation, so extreme speeds sound slightly rougher than the original.
Browsers cannot encode MP3 or OGG, so the resampled audio is saved as uncompressed 16-bit WAV data.
No. Resampling runs on the decoded samples inside your browser and nothing is ever uploaded anywhere.

Last updated: October 10, 2026