Analysis & Tempo
BPM Detector & Tap Tempo Online
Find the exact beats per minute (BPM) and musical key of any song automatically, or tap along with the beat to measure tempo in real time. 100% in-browser.
100% browser-based. Zero file uploads.
Live Tap Tempo
Tap the button or press Spacebar repeatedly in rhythm to detect tempo.
— BPM
Taps: 0
Or Detect BPM from Audio File
Drop song file here or browse
Supports MP3, WAV, M4A, OGG, FLAC, AAC · 100% In-Browser
DETECTED TEMPO
— BPM
ESTIMATED KEY
—
DETECTION CONFIDENCE
95%
Audio Lines & Waveform
—Audio Player
FAQ
Frequently Asked Questions
How does automatic BPM detection work?
The detector computes the energy onset flux envelope across the track, filtering out static hum, and runs an autocorrelation algorithm between 60 BPM and 200 BPM to identify the strongest recurring beat interval.
How do I use the Tap Tempo feature?
Tap the "Tap Beat" button or tap the Spacebar on your keyboard along with the beat of any song. The tool averages your last 4 to 8 taps to calculate the exact tempo in beats per minute.
Is my audio kept private?
Yes, 100%. All tempo analysis and audio decoding happen locally inside your browser memory without server uploads.
Can this tool detect musical key?
Yes, it computes harmonic chromagram distribution across 12 pitch classes to estimate both major and minor keys accurately.