Analyze BPM & key in your browser
Drop in any track to measure tempo, key, Camelot code, and confidence without leaving the page.
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BPM and Key Finder - Verify tempo and key before you hit play
Analyze any audio file for BPM, musical key, and Camelot compatibility directly in your browser. BPMKeyFinder pairs Essentia.js with a privacy-first workflow so touring DJs, editors, and educators can trust every result.
Runs fully in-browser—no uploads, no queue.
Accuracy and Privacy for Professional Workflows
BPMKeyFinder blends field-tested audio analysis with a secure browser runtime so you can make set decisions with conviction.
Field‑tested accuracy
BPMKeyFinder's engine has been benchmarked in both academic research and real DJ sets. It cross‑checks tempo estimates and delivers a practical BPM within the typical 60–180 range, while still providing the raw detection estimates for those who may want to explore half‑time or double‑time rhythms.
Private by default
All processing happens locally on your machine. Your track never leaves your browser, so you retain complete control of your music files. There's no cloud processing, ensuring full privacy for sensitive or unreleased tracks.
Built for real DJ sets
The analysis output includes extras like Camelot wheel key codes, major/minor mode detection, and confidence ratings. This added context ensures you can plan song transitions with reliable harmonic compatibility, keeping your mixes musical and smooth.
Three Steps to Reliable BPM & Key Data
From first drag-and-drop to exported CSV, each stage is optimized for busy DJs, producers, and directors.
Load your audio
Drag and drop or select an audio file in MP3, WAV, FLAC, AIFF, AAC, or OGG format. Extended mixes are supported as long as your device's memory can handle them (most computers can comfortably analyze a 20+ minute track).
Analyze with Essentia.js
The tempo, harmonic profile, and tonal strength are all computed locally using MTG's Essentia engine compiled to WebAssembly. This on-the-fly analysis is fast and doesn't require an internet connection.
Review the results
Inspect the track's BPM, musical key (e.g. C major or A minor) with its Camelot code, the mode (major/minor), track duration, and the confidence level of the detection. If needed, you can export a CSV summary of the results for your records or to sync with DJ software.
Features to Keep Your Library Ready for the Booth
Each feature is designed around real-world DJ prep, remix sessions, and classroom planning.
Accurate BPM normalization
BPMKeyFinder cross-checks detected tempos and adjusts to a usable BPM within 60–180, avoiding offbeat half- or double-tempo errors. It also provides the raw tempo estimates for advanced users who might need to see alternate values for creative mixing.
Camelot & musical notation together
For every track, the key is shown in standard musical notation (like C major or A minor) and as the corresponding Camelot code on the harmonic mixing wheel (e.g. 8B, 9A). This makes it easy to make harmonic mixing decisions at a glance.
Batch-friendly workflow
Need to analyze multiple tracks? You can queue up several files for back-to-back analysis. Each file is processed client-side in your browser, so there’s no throttling of your uploads and your library stays completely private.
Confidence insights
Each result comes with a confidence score to indicate how strong the detection is. A high confidence percentage means you can be more assured of the detected key, whereas a lower score might prompt you to double-check that track (especially for complex mashups).
CSV export & history (Pro)
Pro users can keep a structured log of all their analyses and export the results as CSV files. This is perfect for syncing track metadata with tools like rekordbox, Engine DJ, or your DAW project sheets, ensuring your library information is up-to-date.
Mobile-ready interface
The web interface is fully responsive and optimized for various devices. Whether you’re on a laptop at the DJ booth, a tablet, or a phone, you can easily upload tracks and review analysis results on the go.
Who Relies on BPMKeyFinder
Professionals across the industry trust BPMKeyFinder in their daily workflow.
Touring and club DJs
Confirm track tempos and compatible keys before stepping on stage, ensuring that transitions between new promo tracks or custom edits remain musically seamless.
Music producers & editors
Align samples, stems, and cue points perfectly to your project's grid. Quickly identify if a vocal or instrument track needs to be transposed or time-stretched to fit your mix.
Educators & choreographers
Provide students or dance teams with reliable BPM and key information without needing expensive, complex software. It's an efficient way to plan music for classes and choreography, using accurate data to save time.
Trusted by Working Professionals
Professionals across the industry trust BPMKeyFinder in their daily workflow. From touring DJs to post-production teams and studio directors, many have integrated BPMKeyFinder to make tempo and key planning easier and more reliable.
Lena Wu
Tour DJ · Shanghai
Latency-free analysis is crucial on the road. BPMKeyFinder lets me vet incoming promos on my iPad before each set.
Marcus Bell
Post-production Supervisor
The confidence readout tells my assistants when to double-check stems. The CSV export drops straight into our cue sheets.
Aiko Tanaka
Dance Studio Director
We programme classes around precise tempos. Having BPM and key ready in seconds keeps rehearsals tight.
Sample Analysis Results
Preview the kind of information BPMKeyFinder delivers after each analysis. When you're ready, try it with your own tracks to get a detailed CSV report of the results.
Start for free. Upgrade when BPM planning becomes routine.
The free tier covers occasional spot-checks, while the Pro plan unlocks unlimited use, batch processing, and more – perfect for power users who plan sets regularly.
Free
- ✓3 analyses per day
- ✓Single-file uploads
- ✓Core BPM and key detection features
- ✓In-browser processing (your files never leave your device)
Pro
Best for power users- ✓Unlimited analyses
- ✓Batch uploads & CSV export
- ✓Analysis history & metadata syncing
- ✓Priority email support
Frequently Asked Questions
Answers to the topics DJs, producers, and educators ask us most often.
How accurate is the analyzer?
We rely on Essentia.js, the WebAssembly build of the Music Technology Group's renowned MIR toolkit, for audio analysis. BPMKeyFinder normalizes the detected tempo and flags a track if it appears to fit better at double-time or half-time. For very dense mashups or songs with multiple layers, we recommend double-checking the result by ear and looking at the confidence value as a guide.
Do my audio files ever leave my device?
No. All analysis runs entirely in your web browser. We never upload, store, or queue your music files on any server, and nothing is ever cached outside your local session.
Which formats and track lengths are supported?
BPMKeyFinder works with common audio formats including MP3, WAV, FLAC, AIFF, AAC, and OGG. There's no strict limit on track length aside from your device's memory constraints – as a rule of thumb, most laptops can comfortably handle analyzing a mix around 20 to 30 minutes long.
Can I analyze streaming audio or YouTube links?
Not at this time. To protect your privacy, BPMKeyFinder currently supports only local audio files and does not handle direct links from streaming services or YouTube. If analyzing links is a feature you need, subscribe to our newsletter – we'll let you know as soon as direct link analysis becomes available.
How does the share feature work?
After analyzing a track, you can click the 'Share Result' button to generate a unique shareable link. This link encodes the analysis results (BPM, key, energy, etc.) directly in the URL using base64 encoding. Anyone with the link can view the results without needing to re-analyze the file. No server storage is required, and the link never expires.
Is my shared data private and secure?
Yes. The share feature only includes analysis metadata (BPM, key, Camelot code, etc.) – never your actual audio file. The data is encoded in the URL itself, not stored on any server. However, anyone with the link can view the results, so only share links with people you trust. Your original audio file always stays on your device and is never uploaded.
Plan Smarter Sets with Verified Tempo and Key Data
Join the many touring DJs, producers, and educators who trust BPMKeyFinder for quick, private analysis. Upload a track now to see it in action, or read our workflow guide to learn more about integrating BPMKeyFinder into your routine.