BPM Detector - Free Online Tool | PivaBox

Detect BPM (beats per minute) from audio — onset detection algorithm with tap tempo mode. All processing in your browser

How to Detect BPM Online

  1. Upload an audio file or enable your microphone to capture live audio for BPM analysis
  2. Click Analyze BPM — the tool applies a low-pass filter to isolate the beat, computes the energy envelope, detects onsets, and finds the dominant beat interval using histogram analysis
  3. View your BPM result with confidence percentage and genre hint. Alternatively, use Tap Tempo mode to manually tap along with the beat

Frequently Asked Questions

Is BPM Detector free?

Yes, PivaBox BPM Detector is completely free to use. There are no charges, subscriptions, or hidden fees. All audio analysis runs locally in your browser using the Web Audio API.

Are my audio files uploaded to a server?

No. All BPM detection and audio processing happen entirely in your browser. Your audio files never leave your device, ensuring complete privacy.

How accurate is the BPM detection?

The tool uses onset detection with a low-pass filter (~200Hz) to isolate kick drums and strong beats, an adaptive energy threshold, and histogram analysis to find the dominant beat interval. Accuracy is typically within 1-2 BPM for tracks with clear, consistent beats. Tracks with complex rhythms or tempo changes may have lower accuracy.