Audio Speed Changer

Change the tempo of any audio file from 0.5x to 2x while keeping the pitch natural. Great for practicing music, speeding up lectures and creating effects.

100% free No uploads Runs in your browser No signup

Change audio speed

Drop a file to processProcessed by FFmpeg compiled to WebAssembly — entirely on your device

Speed: 1.25×

Pitch is preserved

The atempo filter changes playback speed while keeping pitch natural — great for speeding up lectures and podcasts or slowing down fast passages for practice. Extreme values (below 0.5 or above 2) are clamped automatically by chaining.

How to use the Audio Speed Changer

1
Open the tool above — it is already running, no install or account needed.
2
Enter your input and adjust the options to match what you need.
3
Copy or download the result — everything was processed locally in your browser.

Private by design

This tool runs 100% inside your own browser using local JavaScript — your input never touches a server. That makes it instant, offline-capable in many cases, and private even for sensitive data.

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