BPM & Key Analyzer

Detect BPM and musical key of any audio file. Powered by Essentia.js — all processing happens in your browser. No files are uploaded or stored.

Drop audio files here or click to browse

MP3, WAV, OGG, FLAC, AAC, M4A — max 50MB per file, up to 10 files

Client-Side

All analysis runs in your browser using WebAssembly. No files are uploaded to any server.

Fast Analysis

Analyzes up to 45 seconds of audio from the center of the track for accurate results.

Private & Secure

Your audio never leaves your device. No data is collected, stored, or shared.

Rate limited to 5 analyses/min · 20 analyses/hour · 50MB max file size