Song Key & BPM Finder

Method

How It Works

1. Drop an audio file (or several) into the analyzer above
2. Your browser decodes it and resamples to the analysis rate, all locally
3. Tempo detection scores thousands of beat-grid candidates against the onset pattern of the track
4. Key detection runs a neural network over the full harmonic spectrum, the same model that ships in the Vibes app

Analyzing a File vs Looking Up a Released Song

This analyzer is for audio files you have on your device: promos, downloads, your own productions, untagged edits. If you want the key and BPM of a released track you don't have as a file, you can search our track database instead; it covers tens of thousands of electronic releases with key, BPM, energy, and harmonic-mixing suggestions per track, or browse by key via the artist directory.

Your Files Never Leave Your Device

Most online key and BPM finders upload your audio to a server for processing, which means waiting on the upload, size limits, and your unreleased edits sitting on someone else's machine. This tool works differently: the analysis engine is compiled to run inside your browser. Decoding, tempo detection, and the key-detection neural network all execute on your own device. Nothing is transmitted, stored, or queued. That matters if you are analyzing unreleased promos, your own productions, or bootleg edits you would rather not upload anywhere.

Reading the Result

• BPM is the snapped whole-number tempo DJs use; the precise decimal underneath is what your DJ software will show after beat-gridding
• Half / double time shows the same groove counted at half or twice the tempo. Genres like drum & bass and dubstep are routinely written one way and felt the other, so if the main reading feels wrong, one of these is your answer
• Key is shown three ways: musical name (A minor), Camelot code (8A), and Open Key (1m). Click the Camelot code to browse tracks in the same key in our track directory
• Energy is a 1-10 intensity rating in the Mixed In Key tradition, estimated from loudness, dynamics, bass weight, percussive activity, and tempo of the beat-active section. Use it to sort warm-up material from peak-time weapons
• Confidence tells you how unambiguous the detection was. Low BPM confidence usually means sparse or shifting percussion; low key confidence usually means heavy atonal content or long mixed sections

What to Do With Key and BPM

Once you know a track's key and tempo, harmonic mixing is mechanical: tracks mix cleanly with others that share their Camelot code or sit one step away on the wheel. Use the key compatibility checker to test a specific pairing, the harmonic mixing chart as a full reference, or the key transposer when you plan to pitch a track up or down. For tempo planning across a whole set, the halftime/doubletime calculator and set time calculator pick up where the analyzer leaves off.

Batch Analysis and CSV Export

Drop as many files as you like; they queue up and analyze one after another, and your results stay saved on this device between visits. The Export CSV button downloads everything (BPM, precise BPM, half/double-time, key in all three notations, energy, confidence) as a spreadsheet-ready file, free and without an account. AIFF users get special treatment: browsers can't decode AIFF natively, so this tool ships its own AIFF reader, covering the format most DJ libraries actually run on.

Analyzing One Track vs Your Whole Library

This page is built for spot checks: a promo you just downloaded, a track someone sent you, a file with missing tags. If you need key and BPM across thousands of files, plus playlists organized by energy and mood, that is what the Vibes app does. It runs this same analysis engine across your entire library automatically and writes the results where Rekordbox, Serato, and Traktor can read them.

Frequently Asked Questions