Online Key Detector
Detect major or minor key from a beat or loop in seconds — straight from your browser. No installs. No uploads. 100% free.
Processed in your browser — your file never leaves this device.
Why detect key with FELAR?
Built for producers tagging tracks for upload without guessing the key from a rough bounce.
Major & minor keys
Detect musical key and map it to FELAR’s major/minor key list for clean storefront tags.
100% free
No signup, no fees. Detect key as often as you need while prepping your catalog.
Private by design
Analysis runs on your device. Your audio is never uploaded to FELAR servers.
Works online
No installs. Open the page on desktop or mobile and detect whenever you need to.
How to detect key online
Three steps. No account required.
Step 1
1. Upload your audio
Drag and drop an MP3, WAV, or FLAC file, or click to browse. Files stay on your device.
Step 2
2. Detect the key
Hit detect and FELAR reads the key from your audio in the browser.
Step 3
3. Copy or use on upload
Copy the key code, or jump straight into beat upload with the value filled in.
Frequently asked questions
Is there a file size limit?
Yes — studio tools support files up to 80.0 MB in the browser. For larger masters, upload via Products on your FELAR storefront.
How does key detection work?
Detection runs Essentia’s KeyExtractor entirely in your browser — no upload required. Results map to FELAR’s major/minor key list.
Are my files secure?
Your audio never leaves your device. There is no upload step — detection happens entirely in your browser with Essentia.
What key format do I get?
Results map to FELAR’s major/minor key codes so they drop cleanly into beat upload and storefront filters.
Can I use it on mobile?
Yes. The detector works in modern mobile browsers on iOS and Android.
Free online key detector for producers
Need to tag a beat before upload? Drop your file, detect the key, and copy it — or send it straight into FELAR beat upload. No software install, no account, and no upload to a third-party server.
Pair it with FELAR’s BPM detector, audio converter, and trimmer when you’re prepping tracks for your storefront.
Supported formats
- MP3
- WAV
- FLAC
Common uses
- Tag key before uploading a beat
- Confirm major vs minor on a loop
- Fill storefront filters accurately
Related tools
More free studio tools that run in your browser.
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