Audio Speed Changer
Speed up or slow down an audio file and export the result.
- 1Upload
- 2Adjust
- 3Download
Key features
Upload an audio file, drag the slider to speed it up or slow it down, preview the change live, and export the result — like adjusting the speed of a tape, pitch shifts along with speed.
Everything happens locally in your browser using the Web Audio API. Your audio file is never uploaded anywhere.
How to use
Upload an audio file
Pick any audio file your browser can play.
Set a speed
Drag the slider and preview it — 1.0x is the original speed.
Export the result
Download the sped-up (or slowed-down) audio as WAV or MP3.
Frequently asked questions
Does changing the speed also change the pitch?
Yes — like adjusting the speed of a cassette tape or a turntable, speeding up raises the pitch and slowing down lowers it. This tool doesn’t do pitch-preserving time-stretching, which needs more advanced processing.
How much can I speed up or slow down a file?
Anywhere from 0.5x (half speed) to 2x (double speed).
Is my audio file uploaded anywhere?
No. The file is decoded, resampled, and exported entirely in your browser — it never leaves your device.