Learning a fast solo note by note, or getting through a long lecture a little quicker — both need the speed to change without the voice turning into a cartoon. This free audio tempo changer slows audio down or speeds it up while keeping its pitch and key exactly where they were, so an instrument stays in tune and a voice still sounds like itself. Everything runs in your browser, so nothing is uploaded and no signup is needed. The honest limit: this is browser time-stretching, not studio-grade processing, and extreme stretches can introduce artefacts, especially on sharp drum hits.
How to use this audio tempo changer
Slow it down for practice, or speed it up for review.
Drop in an MP3, WAV, or other common audio file. Your original stays untouched.
Drag the tempo slider below 100% to slow down or above 100% to speed up — or type a target BPM and let the tool work out the percentage.
Listen at the new speed with the original pitch intact, then download the stretched version.
Why this audio tempo changer is a practice tool, not a fast-forward button
A media player’s speed button moves pitch with speed. This tool refuses to.
Time-stretching moves beats closer together or further apart while leaving every frequency where it was, so the key never drifts.
Think in percentages for practice (75% for a tricky passage) or in beats per minute for DJ and set work — the two stay in sync, since BPM scales with tempo.
Slow a solo to half speed, learn it clean, then raise the tempo in small steps back toward full speed without retuning anything.
The file is stretched on your own device, so practice tracks and unreleased recordings never leave your browser.
Audio Tempo Changer FAQs
Short, direct answers to the questions readers ask most.
Yes. That is the whole point: keep the pitch setting at its original value and move only the tempo, so the song plays slower in exactly the same key.
Divide the target by the original — 90 divided by 120 is 0.75 — and set the tempo to 75%. The BPM and the speed move together by the same percentage.
Tempo is how fast the music moves, measured in beats per minute; pitch is how high or low it sounds, measured in semitones. This tool changes tempo only — for pitch, use a pitch changer instead.
Time-stretching rebuilds the sound from overlapping frames, and very large stretches expose that rebuilding, especially on sharp transients like drums. Modest changes sound essentially transparent; extreme ones are a known processing limit.
Yes. It runs entirely in your browser — no account, no signup, and nothing uploaded.
Related Tools
More free converters that work the same way — right in your browser.
Change an audio file’s playback speed in your browser, with no upload and no signup.
Audio TrimmerCut an audio file down to the section you want, with no upload and no signup.
Audio JoinerJoin several audio files into one, right in your browser.
Audio Loop MakerLoop an audio file so it repeats seamlessly in your browser.
Try the related tools above, or go back to the Convertion homepage for more free converters.
