Change the speed of a recording
Make a recording faster or slower — from half speed to double — while voices keep their natural pitch. Useful for long lectures and voice notes, or for slowing down fast speech to write it down.
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Get the transcriptHow to do it
- Choose a recording — MP3, M4A, WAV, a voice note or a video.
- Set the speed: below 1× is slower, above 1× is faster.
- Click “Change speed”, listen to the result and download it as MP3 or WAV.
Questions
- Will the voice sound higher or lower?
- No. Only the tempo changes: the recording is cut into short overlapping pieces that are fitted back together closer or further apart, so the pitch stays the same. At the extreme speeds speech can sound a little choppy.
- How much faster or slower can I make it?
- From 0.5× (half speed, twice as long) to 2× (double speed, half as long), in steps of 0.05.
- Does it work with video files?
- Yes. Choose an MP4, MOV, MKV or WebM video and you get its sound at the new speed as an MP3 or WAV file. The picture is not kept.
Related tools
- Remove silenceCut long pauses out of a recording: choose how long a pause may be and see how much time was removed. MP3 or WAV, free, in your browser, nothing is uploaded.
- Split audioCut a long recording into parts every few minutes or at the times you choose. Download each part or all of them in one ZIP. Free, in your browser, nothing is uploaded.
- Fade in and fade outAdd a smooth fade-in at the start and a fade-out at the end of a recording. Choose the length in seconds and save as MP3 or WAV. Free, in your browser.
- Stereo to monoTurn a stereo recording into mono and lower the sample rate to make the file smaller. MP3 or WAV, free, in your browser, nothing is uploaded.