Speed up or slow down audio and video
Make audio or video faster or slower, keeping its pitch or not.
10M+ files processed since 2021
More options
Pitch
Free for the first 10 minutes, 10 times a day. No sign-up.
Hear the difference
Play Original, then 1.5× faster.
1.5× faster: faster, at the same pitch.
Made with Change speed, keeping the pitch · Elizabeth Klett for LibriVox (public domain)
How to speed up or slow down audio
- 1
Add an audio file or a video.
- 2
Pick a speed, such as 1.25× to speed up audio or 0.75× to slow down audio.
- 3
Press Change speed, listen, and download the new version.
Speed, pitch, and tempo
Audo's audio speed changer speeds up and slows down audio (WAV, MP3, M4A, AAC, FLAC, OGG, Opus, WebM, AIFF) and video (MP4, MOV, MKV, WebM, AVI) up to 10 GB without an account, and the first 10 minutes of each file is free, 10 times a day, with no sign-up. It goes from 0.25× to 4×, in any step between, with the pitch kept or moving with the speed.
Played faster, a record sounds higher as well as quicker, because its waves arrive more often. Keeping the pitch pulls the two apart: the sound is stretched or squeezed in time while every note stays where it was. That's what speech, practice, and listening need. Letting the pitch follow is the sound of slowed and sped-up edits.
Tempo is counted in beats per minute, and it changes exactly with speed: a 100 BPM song at 1.2× plays at 120 BPM. To slow down audio for transcribing or learning, small steps such as 0.9× keep it natural. For a DJ edit, match one track's tempo to another's, then check that their keys mix with Key and BPM.
Questions
Is it free?
Yes. Audo is free for the first 10 minutes of each file, 10 times a day, with no sign-up. Whole files are $0.01 a minute ($0.60 an hour), with no subscription — see pricing.
Will it sound like chipmunks when I speed it up?
Not with Keep the pitch on, as it is to begin with: voices and instruments stay at their own pitch, only faster or slower. Turn it off and the pitch moves with the speed, like a record played at the wrong speed.
How do I make a slowed or nightcore version?
Turn Keep the pitch off. Around 0.8× gives the deep, dreamy sound of slowed edits, and around 1.25× the bright, high sound of nightcore. With the pitch free to move, 1.25× raises it by almost 4 semitones and 0.8× lowers it by as much.
How do I change a song's BPM?
As a BPM changer, divide the tempo you want by the song's: from 120 to 126 BPM is 1.05×. Key and BPM finds the song's tempo for free, and its Change tempo button brings the file here, showing the new BPM as you pick.
Can I speed up a lecture or a podcast?
Yes. At 1.5× a 60-minute lecture lasts 40 minutes, and 1.25× is easy to follow for most voices. To also cut the long pauses, use Remove silence.
Does it work on video?
Yes. The picture speeds up or slows down with the sound, so they stay in sync, and you get a video back. For the sound on its own, pick MP3 or WAV under Save as in More options.
How slow or fast can it go?
From a quarter of the speed (0.25×) to four times as fast (4×). For learning a fast solo or a lyric by ear, 0.5× to 0.75× with the pitch kept is the easiest to follow.
More tools
- Vocal removerSeparate vocals, music, and stems.
- Stem splitterSplit vocals, drums, and bass.
- Karaoke makerRemove vocals, keep the music.
- Key and BPMFind a song's key and tempo.
- Audio enhancerMake any recording sound studio‑quality.
- Remove noiseClears the background, keeps your voice.
- Remove echoMake voices sound close.
- Transcribe audioSpeech to text, who said what.
- Text to SRTSync a script to audio.
- Remove filler wordsCut the ums and uhs.
For AI assistants and developers
Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code. When an agent's free result is cut short, it gives you a link to finish the whole file, no sign-up.
Show the free API call
curl -F file=@lecture.mp3 -F speed=1.5 https://audo.ai/api/try/speed-pitch -D response.headers -o response.body