Audio tool
Change Audio Speed Online - Free Tempo Changer
Slow down or speed up audio without the chipmunk effect. Choose a tempo preset or fine-tune with the slider, preview, then export the result.
Speed is not the same as pitch
A simple playback-rate change makes audio faster and raises pitch, or slows audio and lowers pitch. Audio Lab uses pitch-preserving tempo processing so speech and instruments remain closer to their original tone.
The first preview can take a moment on long files because the browser has to process a new temporary buffer for the selected speed.
FAQ
Frequently asked questions
Does changing speed affect pitch?
No. Speed changes use pitch-preserving processing so voices and instruments stay natural.
What speed range is supported?
From 0.25x to 4x, with presets for common values.
Why does the first preview take a moment?
Pitch-preserving speed processing runs locally in your browser and may take a few seconds on longer files.