atempo preserves pitch while changing tempo.

Change Audio Speed

Speed up or slow down audio without changing pitch too much.

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About Change Audio Speed

Adjust audio tempo using ffmpeg's atempo filter. Runs entirely in your browser.

Open the Change Audio Speed tool and add your file — it's processed in your browser, never uploaded.
Adjust the available options to get the result you want.
Download the result. There's no sign-up, no watermark, and no size cap.

Other private, in-browser tools you might need.

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