Change the speed of an audio file
From 0.25× to 4×. By default the pitch stays natural (no chipmunk voice); if you want the classic effect, it is there too.
Your files never leave your device
How to change the speed
- 1
Upload the audio
Any common format.
- 2
Pick speed and pitch
0.25×–4×; natural pitch or classic effect.
- 3
Download the result
Same format as the original.
Why use this tool
Natural pitch
At 1.5× the voice still sounds like the same person, not a cartoon.
Optional classic effect
If you want the classic high or low voice, it is one click away.
Private
Your audio never leaves your device: ffmpeg runs inside your browser.
Real engine
ffmpeg, the industry standard, compiled to WebAssembly and self-hosted.
Frequently asked questions
How is the pitch preserved?
With ffmpeg’s atempo filter, which stretches or compresses time without touching frequency. It is what podcast players use.
What is the classic mode for?
It reproduces the tape-speed effect: faster = higher pitched. Useful for effects or experimental music.
Does the duration change?
Yes, proportionally: at 2× it lasts half as long; at 0.5×, twice as long.