BPM & Key Finder — Detect Tempo, Musical Key & Camelot Notation Online Free
Professional audio analysis for DJs, producers and musicians
Find the exact BPM (tempo), musical key, Camelot/Open Key notation, time signature and energy level of any song. Interactive Camelot wheel shows you which songs mix harmonically. Analyze single files or batch-process your entire library. Tap tempo for manual BPM. Export results to CSV for Rekordbox, Serato or Traktor. 100% free, no registration, no file uploads — everything runs locally in your browser.
Key Features
- Accurate BPM detection using multi-resolution autocorrelation with spectral band weighting
- Musical key detection (major/minor) with Camelot wheel notation for DJs
- Interactive Camelot wheel visualization — see compatible keys for harmonic mixing
- Time signature detection (4/4, 3/4, 6/8, 2/4) — rare among online tools
- Energy and intensity analysis for playlist building
- Waveform display with beat grid markers
- Batch analysis — process up to 20 files at once for free
- Tap Tempo — manually tap to find BPM of any music
- Export results to CSV for DJ software (Rekordbox, Serato, Traktor)
- 100% browser-based processing — complete privacy, no file uploads
How to Find BPM and Key of a Song
- Upload your audio file (MP3, WAV, FLAC, or any format) by dropping it or clicking browse
- Wait a few seconds while the tool analyzes BPM, key, time signature and energy
- View your results: BPM with half/double toggle, musical key with Camelot notation
- Explore the interactive Camelot wheel to find songs that mix harmonically
- Use Batch mode to analyze multiple files, or Tap Tempo for manual BPM detection
- Export results to CSV for your DJ software or personal records
Frequently Asked Questions
How accurate is the BPM detection?
The tool uses multi-resolution autocorrelation with spectral band weighting, analyzing bass, midrange and full spectrum separately. This achieves 90-95% accuracy for most music genres. For songs with unclear rhythm (ambient, free jazz), accuracy may be lower — the confidence meter indicates reliability.
What is the Camelot Wheel?
The Camelot Wheel (also known as Open Key notation) is a color-coded circle used by DJs for harmonic mixing. Each key is assigned a number (1-12) and a letter (A for minor, B for major). Songs with adjacent numbers or the same number mix harmonically.
What is harmonic mixing?
Harmonic mixing is a DJ technique where you blend songs in compatible musical keys for smooth transitions. Songs that are harmonically compatible sound musical when mixed together, while incompatible keys can clash and sound dissonant.
Can the tool detect time signature?
Yes. The tool analyzes beat accent patterns to detect common time signatures: 4/4 (most pop/rock/electronic), 3/4 (waltz), 6/8 (compound duple) and 2/4 (march). This feature is rare among online BPM detectors.
How does batch analysis work?
Switch to Batch mode, drop up to 20 files at once. Each file is analyzed sequentially and results appear in a table. You can export all results to CSV for use in DJ software like Rekordbox, Serato or Traktor.
What is Tap Tempo?
Tap Tempo lets you find BPM manually by tapping a button (or pressing any key) to the beat of music you hear. After 4+ taps, it calculates the average BPM. Useful when you hear music playing but don't have the audio file.
Does it work with all audio formats?
Yes — any format your browser can decode: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, WebM and more. The tool uses the Web Audio API, so format support depends on your browser.
Is my audio uploaded to a server?
No. All processing happens locally in your browser using the Web Audio API. Your audio files never leave your device — nothing is uploaded, stored, or transmitted.
Why Use This BPM & Key Finder
Instant analysis with no queues or waiting. Interactive Camelot wheel for harmonic mixing — a feature most competitors lack. Time signature detection is almost unique among online tools. Batch analysis and CSV export are free (competitors charge $7.99/month). No registration, no limits. Complete privacy — your music stays on your device. Works on any device with a modern browser.
