Audio Speed Changer
Speed up or slow down any song, podcast or voice memo without changing its pitch, then save it as MP3 or WAV.
Drop your song here
- MP3
- WAV
- M4A
- FLAC
- OGG
- Video · Max 500 MB
Common speed changes
Four settings people reach for most. Load one, then open your file to hear it.
120 BPM→90 BPM
Practice a hard part slowly
- 0.75x speed
- Same key
- Length 4:00 → 5:20
Slow a tricky riff, solo or dance routine to three quarters of its speed and play along in the original key. Press + as it sinks in.
120 BPM→60 BPM
Transcribe notes or lyrics
- 0.50x speed
- Same key
- Length 4:00 → 8:00
At half speed fast notes and words are easy to pick out, so you can write down a melody, its chords or the lyrics.
1:00:00→40:00
Get through a podcast or lecture
- 1.50x speed
- Voices keep their pitch
Speech stays clear at one and a half times the speed, so a one-hour episode, class recording or voice memo takes 40 minutes.
120 BPM→150 BPM
A sped-up version
- 1.25x speed
- +3.86 semitones
- Length 4:00 → 3:12
For the brighter, higher sound of a sped-up song, this turns off Keep the original pitch, so the pitch rises with the speed like a record played faster.
How speed changes the length
The new length is the original length divided by the speed: half speed doubles it, double speed halves it.
How to change the speed of audio
Three steps, all on this page.
What people change the speed for
From practice sessions to podcasts, a different speed makes audio easier to use.
Frequently asked questions
Open the file in the speed changer above, press play and move Speed until it sounds right, or tap one of the speed tiles. Then pick MP3 or WAV and press Save.
Yes, and that is how the tool starts: Keep the original pitch is on, so voices and notes stay in the same key at any speed from 0.25x to 4x. Turn it off when you want the pitch to rise and fall with the speed, as on a tape or record.
Any speed from 0.25x, four times slower, to 4x, four times faster, in steps of 0.01x. The − and + buttons move 0.05x at a time, and the tiles jump to common speeds: 0.5x, 0.75x, 1x, 1.25x, 1.5x and 2x.
Divide the length by the speed. A 4:00 song lasts 5:20 at 0.75x, 3:12 at 1.25x, 2:40 at 1.5x and 2:00 at 2x. The new length shows next to the original before you save.
Tempo is the speed of the beat, counted in beats per minute (BPM). Changing the speed changes the tempo by the same factor, so 0.75x turns 120 BPM into 90 BPM. For songs with a steady beat, the tool shows the original and the new BPM.
To learn a part, start around 0.7x to 0.8x, and use 0.5x for very fast passages or for writing music down; raise the speed with + as it gets easier. For podcasts and lectures, 1.25x to 1.5x suits most people, and clear speech still follows well at 2x.
Changes between about 0.75x and 1.5x sound the most natural. Toward 0.25x or 4x the sound is stretched or squeezed much further, which works well for study, effects and quick listening. The file keeps its sample rate and saves as MP3 at 320 kbps or as lossless WAV.
Here the key either stays as it is or moves with the speed. To raise or lower a song by semitones, at its own speed or a new one, use the Pitch Changer.
You can open an MP4, MOV or WebM video and change the speed of its soundtrack. The saved file is the sound only, as MP3 or WAV.
MP3, WAV, M4A, FLAC and OGG audio, plus common video files such as MP4, MOV and WebM, where the soundtrack is used. Each file can be up to 500 MB. You can save the result as MP3 at 320 kbps or as WAV, at the same sample rate as your file.
No. Your browser opens, changes and saves the file on your own device, and nothing is sent to a server. Reloading or closing the page clears it.
Yes. Every feature on this page is free and there is no account to create, so you can change the speed of as many files as you like.