Speed up audio — free online tool

Speed up audio from 1.25x to 4x without raising the pitch; see how much time a lecture or podcast saves at 1.5x and 2x.

Audio

Speed up audio

Choose a file, adjust the edit, preview the result, and export it.

Or drop an MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or WebM audio file anywhere on this page.

Processed audio will appear here.

What to know

Speed up starts the multiplier at 1.25, the usual choice for lectures, voice notes and audiobooks, and lets you go as high as 4. The pitch stays where it was, so a faster voice does not turn into a chipmunk.

The time you save is easy to work out. A 40-minute lecture takes 32 minutes at 1.25, 26 minutes 40 seconds at 1.5, and exactly 20 minutes at 2. A 90-minute podcast at 1.5 drops to a full hour. Past 2, the tool chains two stages, so 3 and 4 are applied as 2 times 1.5 and 2 times 2.

Speech tolerates speed far better than music. Clear single speakers stay understandable up to about 2, while fast talkers, accents and noisy rooms tolerate less. A good approach is to try 1.5 on a one-minute test export and only raise it if you still follow every word.

Changing the speed also shortens silences and pauses in proportion, which is often exactly what you want for a recorded meeting, though it does squeeze natural breathing space.

The result is a new file, so your original recording is untouched. Pick MP3 at 128 kbps for spoken word to keep the sped-up copy small.

Choose a specific task 6
Related tools 5
How to use Speed up audio — free online tool
  1. Load meeting.m4a and keep the starting multiplier of 1.25, or press the 1.5 preset.
  2. Check the predicted length: a 60-minute file at 1.5 should read 40 minutes.
  3. Choose MP3 at 128 kbps and Mono if it is a single speaker.
  4. Process, listen to a stretch of the preview, and download meeting-speed-up.mp3.

Quick answers

Where does the multiplier start on this tool?

At 1.25, the default for speeding up, and you can raise it to 4 in steps of 0.05.

How much time does 2x save on a 90-minute podcast?

45 minutes, since 90 divided by 2 is 45.

Will a sped-up voice sound higher?

No. The atempo filter keeps pitch, so the voice sounds faster but not higher.

What speed is safe for fast speakers or accents?

Try 1.25 to 1.5 first. Many listeners lose clarity above 2x, and background noise makes it worse.