Change audio speed & pitch

Speed up or slow down a track without the chipmunk effect, or shift the pitch up and down in semitones — each independently, right in your browser.

No uploadNo sign-upTempo 0.5–2×Pitch ±12 st

Drop an audio file to change

or click to choose from your device

Choose audio

MP3 · WAV · AAC · FLAC · OGG · M4A · OPUS

Your file is decoded and processed locally with the Web Audio API. Nothing leaves your browser.

How it works

Change speed & pitch in three steps

Add your file

Drag an audio file onto the box or click to browse. It decodes instantly — no upload.

Set speed & pitch

Change the tempo from half to double speed, and shift the pitch up or down by up to 12 semitones — independently.

Export

Download the result as MP3 or WAV. Process as many files as you like, free.

Why use it

Independent tempo and pitch

Speed without the squeak

Time-stretching changes the tempo while keeping the pitch natural — no chipmunk voices.

Pitch in semitones

Transpose up or down by whole semitones for key changes, harmonies or effects.

100% private

Everything runs on your device — nothing is uploaded, so your audio stays yours.

See the new length

A live estimate shows how long the track will be at your chosen speed before you export.

Good to know

Speed and pitch, explained

On an old record player, speeding up audio also raised its pitch — the two were locked together. Modern time-stretching breaks that link. This tool changes tempo and pitch independently, processing everything locally with the Web Audio API.

Change speed, keep the voice natural

Slow a tutorial down to follow along, or speed a podcast up to save time — the pitch stays the same, so voices sound normal rather than sped-up or slowed-down cartoons.

Shift pitch, keep the timing

Transpose a backing track into a comfortable key, or nudge a sample up a few semitones, without changing how long it plays. Twelve semitones equals one full octave.

FAQ