Audio Speed Changer
Change audio playback speed in the browser and see the new duration instantly.
Quick answer: enter your details below and click Calculate New Duration — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Converters & Utilities
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How to use
- Enter the original audio length in seconds.
- Choose the playback speed you want.
- Read the new duration, then play at that speed in a browser.
About this tool
Audio Speed Changer lets you listen faster or slower without changing pitch in the usual browser playback sense, using the Web Audio playback rate in a browser. Enter the original length and a speed, and the tool works out the new duration at once, which is handy for lectures, interviews, and long recordings. Outside a browser it shows that duration maths, so you can plan before you listen.
Frequently asked questions
Does faster playback change the pitch?
Browser playback-rate playback can shift perceived pitch at extreme speeds, but at common speeds like 1.25x or 1.5x speech stays easy to follow.
What speeds work best for speech?
Most listeners find 1.25x comfortable for lectures and 1.5x workable for familiar material.