Free tool

Audio Speed and Pitch Changer

Speed up, slow down or change the pitch of any audio independently. 100% in your browser.

Drag your audio here or click to select

MP3, WAV, OGG, FLAC, M4A, AAC · no artificial size limit

Select audio

Built by

Miguel Ángel Colorado Marin (MACM)

Full-Stack Developer · Guadalajara, España

I develop web apps, digital tools and full projects — from design to deployment.

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The speed and pitch changer lets you speed up or slow down an audio while keeping the voice or music sounding natural (without the "chipmunk" or "slow-motion baritone" effect), or conversely, deliberately shift the pitch in semitones without touching the playback speed. Upload your MP3, WAV, OGG, FLAC, M4A or AAC file, adjust the speed between 0.25x and 4x, decide whether to keep the original pitch or let it rise and fall with the speed (the classic sped-up record effect), and optionally raise or lower the pitch in semitones while keeping the speed you chose. All processing runs with FFmpeg compiled to WebAssembly inside your own browser.

Features

  • ✓Speed from 0.25x to 4x
  • ✓Keep or shift pitch along with speed
  • ✓Pitch adjustment in semitones, independent of speed
  • ✓MP3, WAV, OGG, FLAC, M4A, AAC
  • ✓100% in browser, no uploads

How to change an audio's speed or pitch?

  1. 1

    Upload your audio

    Drag the file or click to select it.

  2. 2

    Adjust the speed

    Move the slider or use the quick shortcuts (0.5x, 1.5x, 2x...).

  3. 3

    Choose whether to keep the pitch

    Turn it on for a natural speed change, or off for the record-player effect.

  4. 4

    Or adjust the pitch directly

    Raise or lower in semitones without touching the speed.

Frequently asked questions

Is my audio uploaded to a server?

No. Everything runs with FFmpeg compiled to WebAssembly inside your browser. The file never leaves your device.

Why does my voice sound high-pitched when I speed up the audio?

That's the default behavior of simply speeding something up: the pitch rises with the speed. Turn on "Preserve pitch" to avoid it.

Can I change speed and pitch independently at the same time?

Yes, set your desired speed first and then adjust the pitch in semitones: the final speed stays the same while the pitch changes.

What formats does it support?

MP3, WAV, OGG, FLAC, M4A and AAC. The result downloads in the same format as the original file.

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Embed Audio Speed and Pitch on your site

Add Audio Speed and Pitch to any web page with a simple iframe. Free, with attribution to miguelacm.es.

<iframe
  src="https://miguelacm.es/embed/audio-speed-pitch"
  width="100%"
  height="700"
  frameborder="0"
  title="Audio Speed and Pitch — miguelacm.es"
></iframe>
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