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Gratis Audio Speed Changer

Speed up or slow down audio with the pitch preserved (great for podcasts) or shifted. Export as MP3. Runs entirely in your browser, no upload.

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Speed up or slow down audio — keep the natural pitch (great for podcasts and audiobooks) or shift the pitch. Runs entirely in your browser.

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Hoe het werkt

Changing audio speed can either keep the pitch natural (so a sped-up voice doesn't sound like a chipmunk) or shift it (the classic record speed-up). This does both with FFmpeg in your browser.

1
FFmpeg.wasm loads once
The WebAssembly build downloads on first use and is cached afterwards.
2
You pick a speed and pitch mode
From 0.5× to 3×, with "keep natural pitch" on or off. The file stays in your browser.
3
FFmpeg re-times the audio
Natural-pitch mode uses chained atempo filters (time-stretch); pitch-shift mode uses asetrate (speeds and pitches together).
4
Download the MP3
The result is encoded to MP3 and previewed with the built-in player.