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.

Select or drag and drop your media file into the Change Audio Speed tool above. Your file is processed directly inside your browser using WebAssembly.
Configure your desired settings, conversion presets, or editing controls for the selected media.
Process your file locally and preview the result in the interactive player or canvas viewer.
Click Download to save the finished file directly to your device with no watermarks, accounts, or file size limits.

Other private, in-browser tools you might need.

Cut a section out of an audio file, quick and lossless.

Join multiple audio files into one track.

Make an audio file louder or quieter.

Play an audio file backwards.