Audio speed changer
Speed up or slow down any audio with the pitch kept natural for comfortable listening, then export a WAV at that speed, all in your browser.
Files are processed in your browser and never uploaded.
How to use Audio speed changer
Add your file
Drop your audio file onto the upload area, or tap the area to choose it from your device.
Set the options
Choose Speed. Every setting is on screen before you add a file, so you can see what the tool will do before it runs.
Run it and save
Press Download at this speed, Don →. The button stays disabled until there is something to work on, and each file shows its own progress and result. Press Download at this speed, Don →. Each finished file keeps a name based on the one you started with, so you can tell the versions apart.
What this tool does
Play from a quarter speed up to four times
The speed slider runs from a quarter speed up to four times, so you can slow a lecture down to transcribe it or run a podcast at double.
Keeps the pitch natural while listening
Keep pitch is on by default, so a voice at 1.5x still sounds like the same person. Turn it off if you want the old tape effect.
Quick presets and a fine speed slider
Presets for 0.5x, 0.75x, 1x, 1.25x, 1.5x and 2x are one tap away, and the slider is there for anything in between.
Export as WAV or MP3 at your chosen speed
Download as WAV or MP3 and the file plays at the speed you set, so it stays that way in any player you open it in.
Runs in your browser, nothing uploaded
The audio is decoded and re-encoded in your browser, so nothing is uploaded and there is no account.
Frequently asked questions
Is my audio uploaded anywhere?
No. The audio is loaded and processed entirely in your browser. Nothing is uploaded, and the file you export is created on your own device.
Does changing the speed change the pitch?
In the player, no. The player keeps the pitch natural while it speeds up or slows down, which is ideal for listening to speech or lectures. You can turn that off with the checkbox if you want the chipmunk or slow-tape effect.
Why does the exported file change pitch?
Exporting a sped-up file with the pitch perfectly preserved needs heavy time-stretching that is not reliable in a browser, so the export speeds the audio like a tape, which also shifts the pitch. For natural-pitch listening, use the player rather than the export.
What speeds can I use?
Anything from a quarter speed up to four times, with quick presets at 0.5, 0.75, 1, 1.25, 1.5 and 2 times. Slower is useful for transcribing or learning music, faster for getting through talks quickly.
What file types work?
Common audio files such as MP3, WAV, M4A, OGG and others your browser can decode. You can save the result as either WAV (uncompressed) or MP3 (smaller file).
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