BPM and Key Analyzer Online Free — Complete DJ Analysis

Professional DJs use both BPM and key information to create seamless, musical mixes. Analyzing them together saves time and gives you everything you need in one place:

• BPM — ensures beats align perfectly for smooth transitions (beatmatching)
• Musical key — ensures melodies and harmonies blend without clashing (harmonic mixing)
• Camelot notation — simplifies key compatibility into an easy-to-use number/letter system
• Compatible keys — instantly see which other keys will mix harmonically with your track

This is the same information provided by professional DJ software like Rekordbox, Serato, and Mixed In Key — but free, in your browser, with no upload required.

Our analyzer runs two algorithms simultaneously:

• BPM detection — multi-stage onset detection and autocorrelation algorithm analyzes the energy envelope to find the dominant tempo
• Key detection — chromagram extraction and Krumhansl-Schmuckler key profile matching identifies the musical key and mode

Both algorithms run in parallel in your browser using Web Workers, so analysis is fast even for long tracks. Results include confidence scores so you know how reliable each detection is.

Once you have the BPM and Camelot key of your tracks, harmonic mixing is straightforward:

1. Match BPM — use your DJ software's pitch fader to align the tempos of the two tracks
2. Check Camelot compatibility — select your next track from the compatible keys shown in the analyzer
3. Mix — with matching BPM and compatible keys, the transition will sound musical and professional

• DJ set preparation — analyze your entire library before a set to plan harmonic progressions
• Live DJ performance — quickly analyze tracks on the fly to find compatible next tracks
• Music production — detect BPM and key of samples before importing into your DAW
• Remix projects — know the original BPM and key before starting a remix