Speed up a podcast, an audiobook or a voice message, or slow down a song, from 0.5× to 2×. Your file stays yours: we never receive or store it. Voices keep their natural pitch unless you want the tape effect.
or drop a file anywhere on this page
MP3, WAV, M4A, FLAC, OGG and more
Your contracts, passport scans and family videos stay yours. No one but you gets to see them.
They don’t even reach us: your phone or computer does the work. Nothing to delete later.
No daily limits, no file-size cap, no paid Pro plan.
No account to create, no email to give. No account, nothing to hack.
A podcast goes by quicker at 1.5×. A fast lesson is easier to follow at 0.75×. A dance routine often needs the song a little slower or faster. The page opens at 1.5×, a good start for speech.
By default the sound is time-stretched: it gets shorter or longer, but voices and instruments keep their pitch. A fast lecture doesn’t sound like a cartoon, and a slowed song stays in tune. The stretching is done by Signalsmith Stretch, an open-source algorithm that runs on your device.
Switch on Change pitch with speed and the two move together, like on an old cassette: faster sounds higher, slower sounds deeper. That’s how nightcore and slowed versions of songs are made.
Every tool is free and will stay free. No trial, no ads, no paid plan.
Open the page and start. No account, no email, no password.
Nothing to upload and no queue: a video opens in a second, a simple trim saves in seconds.
We set none. A file can be as big as your device can handle.
No logo on top and no rights claimed: what you make is 100% yours.
The same tools on iPhone, Android and a computer, with big buttons and plain words.