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MGToolbox

BPM & Tempo Detector

Analyzer100% In-Browser

Find the tempo of any song or loop — onset-energy autocorrelation with confidence score and beat grid, fully in-browser.

Select an audio track to detect BPM

Supports MP3, WAV, M4A, FLAC, OGG (Max 100MB) · never uploaded

100% In-Browser • Files are processed 100% locally
Zero Data Collection
Files are processed 100% locally
Instant Client-Side Speed
Zero network upload delays
Free & Unlimited
No registration or credit card needed

Find the BPM of Any Song — Free, Instant, Private

Upload a track and get its tempo in beats per minute, an honest confidence score, and a beat grid showing where the beats actually land — useful for DJs syncing tracks, dancers counting routines, and musicians sampling loops.

Tempo is estimated with onset-energy flux and autocorrelation, the standard signal-processing approach used by classic tempo trackers. It is deterministic and runs locally; songs with a steady drum track read almost perfectly, while rubato piano or ambient material genuinely has no single tempo to find.

Frequently Asked Questions

Everything you need to know about using BPM & Tempo Detector safely and efficiently.

Tempo perception is octave-ambiguous: a 120 BPM track can be heard as 60 or 240. The detector weights toward the 80–160 range where most music sits, but for your use case you can simply halve or double the result.
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