Drop in a song. It finds the pulse and warps every beat onto a flawless tempo grid at your BPM — rock-solid timing, pitch untouched, zero drift. All in your browser.
no install · no account · wav mp3 flac ogg m4a · export wav or mp3
Drag in any audio file. It decodes instantly in the browser and shows the waveform — your file never leaves your machine.
A spectral-flux onset detector and dynamic-programming beat tracker map every beat and estimate the tempo automatically.
A phase vocoder pins each beat to a perfect grid at your target BPM — pitch preserved, no drift — then you export a clean WAV.
A phase-vocoder time-warp changes timing without touching pitch — no chipmunk, no detune, even on big tempo moves.
Beats are pinned to a mathematically even grid, so a four-minute track is as tight at the end as it is at the start.
Librosa-style onset + tempo analysis nails the pulse on anything with a steady groove.
The heavy DSP runs on a background thread, so the interface stays responsive and never freezes while it works.
Beat detection and warping happen entirely in your browser — nothing is uploaded. Download the result as a clean 16-bit WAV or a 320 kbps MP3, ready to drop straight into your session.
Yes — it's completely free to use, right in your browser. No account, no sign-up.
No. The phase-vocoder time-warp stretches timing while preserving pitch, so even large tempo changes won't detune vocals or instruments.
Never. Decoding, beat detection, warping and WAV export all happen locally in your browser — your files don't touch a server.
Common with beat detection. Just type the BPM you actually want into the Target BPM field — the grid is built from your target, not the detected value.
Anything your browser can decode: WAV, MP3, FLAC, OGG and M4A. Export as 16-bit WAV or 320 kbps MP3.
Drop in a file and hear the difference in under a minute. Free to use — no account, no card.
Launch Beat Quantizer