BPM & Key Finder (AudioAnalyzer)
Fast BPM, Key, Camelot, and mood analysis — 100% local in your browser, zero uploads.
Audio Properties
Upload an audio file to view analysis results
Audio Waveform Analysis
Drag & drop audio file or click to upload
Supports MP3, WAV, OGG and other common audio formats
Toolbox
Export functionality available after analysis
Batch Processing
Process multiple audio files simultaneously
Save time by analyzing and converting multiple files in one go
How to Find Song BPM & Key (Tempo)
BPM & key finder for DJs, producers, and editors. It just takes a few seconds—browser-based Essentia.js WebAssembly, Camelot-ready key detection, and on-device rhythm/energy analysis (no uploads needed).
Prepare Files
Drop the audio you want to analyze into a folder. No extra prep needed.
Upload Audio
Drag & drop files into the upload area or click to select from your computer.
Wait for Analysis
Analysis starts automatically. BPM, key, Camelot, and mood metrics arrive fast.
Receive Results
View BPM/Key/Camelot plus energy, danceability, and happiness. Export or retry anytime.
How it Works
Built on the same Essentia core used in research labs. Everything runs in your browser for privacy-first BPM & key detection.
Browser Based
On-device analysis—no audio leaves your machine. Great for sensitive stems and client work.
Detection Algorithms
Essentia algorithms tuned by audio researchers for BPM, beat tracking, and robust key/Camelot output.
AI + Machine Learning
Mood scores (energy, danceability, happiness) blend signal features with ML-style heuristics.
Low-Level Analysis
Extracts onset patterns, spectral cues, and tonality features so you can trust the BPM/key results.
Use Cases
- DJ sets: verify BPM and Camelot keys for smooth harmonic mixing and transitions.
- Production/arranging: match samples, stems, and references by tempo/key in seconds.
- Video/Podcast: pick background tracks by energy and rhythm that fit the scene.
Frequently Asked Questions
Do you upload my audio?
No. Analysis runs locally in your browser (WebAssembly). Files stay on your machine unless you export.
How accurate are BPM and key results?
We use Essentia algorithms plus half/double BPM correction and Camelot mapping. Extremely noisy or live recordings may need a re-run.
What does energy/danceability/happiness mean?
They are signal-based mood scores that combine loudness, rhythmic stability, and tempo proximity to typical dance ranges.
Can I analyze multiple files?
Yes—use the batch processing mode to drag in folders of tracks and export the results table.