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KEY & BPM FINDER
Upload your audio and detect musical key and tempo in seconds. Pure browser processing — your files never leave your device.
KEY & BPM FINDER
Overview
Our Key & BPM Finder is a free, browser-based audio analysis tool that detects the musical key (scale) and beats-per-minute (BPM) of any audio track. Whether you are a DJ, producer, or songwriter, this tool helps you match songs, create mashups, and understand your music library faster.
Privacy First
Because all analysis runs locally in your web browser, your audio files are never uploaded to any server. Enjoy complete privacy while analyzing demos, stems, or full tracks.
Performance
Powered by an industry-proven audio analysis engine, our tool delivers reliable key and tempo estimates in seconds. It uses advanced signal-processing algorithms including chroma analysis and multi-feature beat tracking.
Detects the tonal center and scale (major or minor) of your audio, making it easy to find harmonically compatible tracks for remixing, DJ sets, or music theory study.
Estimates the overall tempo in beats per minute using multi-feature rhythm extraction, giving you a precise BPM value you can trust for grid alignment and beat matching.
No installation, no signup, and no cloud required. Simply drag and drop an audio file into the tool and get results instantly on desktop or mobile.
A Key & BPM Finder is an audio analysis tool that detects two fundamental musical properties of a track: its key (the tonal center and scale) and its BPM (the tempo in beats per minute). DJs and producers use this information for harmonic mixing, mashups, and remixing.
Yes. The tool is completely free to use with no hidden costs, subscriptions, or usage limits.
No. The entire tool runs inside your web browser. Just open the page, upload an audio file, and analyze it instantly.
No. All processing happens locally on your device. Your files never leave your browser.
Any format supported by your browser’s audio decoder, including MP3, WAV, FLAC, OGG, AAC, and M4A.
We use a professional key detection algorithm that analyzes chroma harmonic profiles to estimate key and scale. It is highly accurate for most modern music, though complex or atonal tracks may produce ambiguous results.
BPM is estimated using a professional rhythm analysis engine that combines multiple onset detection functions and beat-tracking algorithms. It works well for most genres with clear rhythmic structure.
Analyzing the first minute provides a fast, accurate estimate for the vast majority of songs while keeping the interface responsive. Most tracks maintain a consistent key and tempo throughout.
Absolutely. The detected key and scale can be used with Camelot notation or traditional circle-of-fifths mixing techniques to find harmonically compatible tracks.
Yes. Knowing the key and BPM of an acapella and an instrumental makes it much easier to pitch-shift and time-stretch them to fit together.
Upload your first track and discover its musical key and tempo in seconds.