Change Audio Speed
Speed up or slow down one audio file. Preserve pitch for natural voices, or shift pitch with speed for a tape-style effect. Output is MP3.
About Change Audio Speed
Audio Speed changes how fast an audio file plays — speed up a meeting recording to review it in half the time, or slow down a music passage to practice it — with a choice between keeping the pitch natural or letting it shift like tape. Processing runs entirely in your browser.
- Category
- audio
- Input
- Accepts: audio/*.
- Output
- Outputs: audio/mpeg.
- Cost
- Free, runs in your browser
- Memory
- high
- Install group
- ffmpeg
Common uses
- Speed up a long meeting or lecture recording to 1.5-2x for review
- Slow a music passage to half speed to learn it by ear
- Slow down a fast talker in a voice memo before transcribing
- Create slowed or sped-up versions of a clip for editing
- Adjust narration pace to fit a video slot
Frequently asked questions
Will voices sound like chipmunks?
Not by default. 'Preserve pitch' keeps voices natural at any speed. Turn it off if you want the classic tape effect where pitch rises and falls with speed.
What speed range is supported?
0.25x (quarter speed) up to 4x, in fine steps.
Does it change the file's quality?
The audio is re-encoded, so quality is very good but not bit-identical. For critical audio, keep the original and work on a copy.
Is my recording uploaded?
No — the processing engine runs in your browser and works offline after the first load.
Can I change pitch without changing speed?
Not directly — this tool couples them (or preserves pitch). A dedicated pitch-shift tool is on the list; tell us if you need it.
Keywords
- audio
- speed
- tempo
- pitch
- slow
- fast
- playback
- voice
- tape
- mp3