Audio Speed Changer Online Free
Change audio speed for free, from 0.1x to 4x, and keep the original pitch. Slow down or speed up MP3, WAV, M4A, FLAC or OGG, and your file stays on your device.
Drop your audio here
or click to browse. MP3, WAV, M4A, FLAC, OGG and more
Slow Down or Speed Up Audio Online
Pick a preset or type any speed from 0.1x to 4x. Voices keep their normal pitch, and the file keeps its format.
Change Audio Speed From 0.1x to 4x
Pick a preset from 0.5x to 2x, or type any speed from 0.1x to 4x in Custom Speed. Below 1x slows the audio down, and above 1x speeds it up.
- Six presets from 0.5x to 2x
- Custom speed from 0.1x to 4x
- Opens set to 1.5x
Change Audio Speed, Keep the Pitch
The tool stretches the timing and leaves the pitch alone, so a voice at 0.75x sounds like the same person talking slower, not deeper. A 10-minute file at 1.5x lasts 6 minutes 40 seconds.
- Result keeps the original file type
- Hear the original and the result
- 10:00 at 1.5x becomes 6:40
MP3, WAV, M4A and More
Open MP3, WAV, M4A, AAC, FLAC, OGG or Opus audio if your browser lists it as audio. The result keeps the same format and gets the speed in its name, like song-1_5x.mp3.
Free, No Sign-Up or Watermark
There is no account, no daily limit and no watermark or added sound. Change the speed of one file, then press Upload another file to do the next.
Try Several Speeds on One File
After a result is ready, pick a new speed and press Change Speed again. Reset clears the result but keeps your file loaded, so you don't have to add it again.
Your Audio Stays on Your Device
The speed change runs in this browser tab after the page loads its audio engine. Anonymous stats such as the speed you picked are sent, never your recording or its name.
How to Change Audio Speed in 3 Steps
Add your audio file.
Drop an MP3, WAV, M4A or other audio file on the box, or click to choose one. The editor opens with a player for the original.
Pick the new speed.
Click a preset such as 0.75x or 1.5x, or type a value from 0.1 to 4 in Custom Speed. Below 1 slows it down, above 1 speeds it up.
Change and download.
Press Change Speed and wait for the progress bar. Play the result and compare it with the original, then press Download to save it in the same format.
Why People Change Audio Speed
Learners slow audio down, busy listeners speed it up, and musicians do both.
Students & Language Learners
Slow a lecture, a podcast or a language lesson to 0.75x or 0.5x to catch every word. The speaker's voice keeps its normal pitch, so it stays easy to follow.
- Slow a fast speaker down to 0.75x
- Practice pronunciation from a lesson at half speed
- Keep a slowed copy of a recorded lecture
Podcasts, Audiobooks and Voice Notes
Save a long episode or audiobook chapter at 1.5x or 2x and play it in any player, even one with no speed control. At 2x, an hour of audio takes 30 minutes.
- Turn a 60-minute episode into 40 minutes at 1.5x
- Speed up voice notes before you share them
- Play a sped-up copy in a car or an old MP3 player
Musicians & Producers
Slow a solo or riff down to learn it note by note while it stays in the same key. Speed up a sample a little to fit the tempo of your track.
- Learn a guitar solo at 0.5x in the same key
- Nudge a sample to 1.05x to match a beat
- Check the timing of a tricky passage at 0.75x
Frequently Asked Questions
Common questions about changing audio speed online.
How do I change the speed of an audio file online?
Drop the file on this page, pick a preset or type a custom speed, and press Change Speed. When the result appears, play it to check, then press Download. It's free, with no account and no watermark.
Does changing the speed change the pitch?
No. The tool changes the tempo only, so voices and instruments stay in the same key at every speed from 0.1x to 4x. In a check with the same filter, a 440 Hz tone still measured 440 Hz at 0.1x, 1.5x and 4x.
Can I change the pitch as well as the speed?
No. Pitch always stays where it was, and there is no pitch or key control. That means this page can't make a slowed-and-deeper or sped-up chipmunk version of a song. It only changes how fast the audio plays.
What speeds can I choose?
Any speed from 0.1x to 4x. Six presets cover 0.5x, 0.75x, 1.25x, 1.5x, 1.75x and 2x, and Custom Speed takes any other value, like 1.1x or 0.9x. A value outside the range shows an error instead of a file.
How long will my audio be after changing the speed?
Divide the original length by the speed. A 30-minute podcast at 1.5x runs 20 minutes, and at 0.75x it runs 40 minutes. The result player shows the new length before you download.
Which audio formats work, and what format do I get back?
Files your browser lists as audio open here, such as MP3, WAV, M4A, AAC, FLAC, OGG and Opus. The result keeps the same file type, so an MP3 stays an MP3. Video files like MP4 are turned away, so extract the sound with Video to MP3 first.
Does changing the speed lower the audio quality?
A little, for some files. The audio is saved again after the change, normally at 128 kbps for MP3 and M4A and as 16-bit for WAV. A 128 kbps MP3 sounds about the same, but a 320 kbps MP3 or 24-bit WAV loses some detail.
Why did I get an error or no result?
The message "Something went wrong" means the audio engine could not load or could not read the file. Check your connection, since the engine downloads when you press Change Speed, then try again. If it fails again, convert the file to MP3 or WAV with the Audio Converter first.
Can I change the speed of several files at once?
No. You can add one file at a time, and there is no batch option. After saving a result, press Upload another file to return to the drop box and add the next recording.
Is this the same as the speed setting in a music player?
Not quite. A player's speed setting only lasts while you listen there. This tool saves a new file at the new speed, so it plays that way everywhere, including players, cars and apps with no speed option.
Is my audio sent to a server?
No. Your recording is read and re-timed inside this browser tab, and the result is saved straight from it. The page does fetch its audio engine from a public code library, and it logs anonymous usage numbers such as speed and size range, but never the audio or the file name.
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