Audio / Video
Audio Speed Changer
Speed up or slow down audio without changing the pitch.
Supported formats: MP3, WAV, M4A, OGG, FLAC, AAC.
Good to know
Frequently asked questions
How do I use it?
Choose your file, adjust the options and press “Change speed”. When it finishes, download the result.
How does it work?
Runs FFmpeg inside your browser. Pressing the process button loads about 32 MB of engine files from unpkg, with jsDelivr as a fallback. The engine is reused while this page stays open; later visits may download it again depending on browser caching. These hosts receive ordinary connection information such as your IP address, not your selected file. Internet access is needed when resources are not cached. Large clips may take several minutes. Uses time-stretching, so voices keep their natural pitch.
Are my files uploaded?
No. Files are processed on your device and never sent to our servers. No account is needed.
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