Key Finder

Upload audio to detect musical key, Camelot code and compatible keys in your browser.

Drop audio here or click to browse

MP3, WAV, M4A, OGG, FLAC up to ~50 MB — analyzed 100% in your browser

What this Key Finder offers

Upload audio to detect musical key with Camelot code in your browser. Chroma analysis compares your track against major and minor profiles.

Key with Camelot code and confidence
Relative major or minor and compatible mixing keys
Twelve-bar chroma chart of pitch energy
Audio playback to verify by ear
Private by design, nothing is uploaded

How to use

Drop an MP3, WAV, M4A or OGG file, or click to browse. Analysis starts automatically.
Wait while the tool builds a chromagram and matches it against major and minor profiles.
Read the key, Camelot code, confidence and compatible harmonic-mixing keys.
Copy the result or pair it with the BPM Finder tempo for your DJ set.

What is Key Finder?

The tool decodes your file, measures energy in each of the twelve pitch classes over time, and compares the profile against major and minor templates.

Camelot codes map keys to a wheel. Adjacent codes mix well: same code, plus or minus one, or the relative major or minor.

A result like 8A A minor means your track centers on A with natural minor colors. Its relative C major shares the same notes, and neighbors 7A, 9A and 8B on the wheel mix cleanly, so plan transitions within that family and confirm by playing the scale over your track.

Features

Key and Camelot

Detects one of 24 keys with Camelot code, for example 8A for A minor.

Chroma chart

Twelve pitch-class bars show which notes dominate your track.

Compatible keys

Energy boost, perfect fifth and relative neighbors for harmonic mixing.

Copy and mix

Copy key and Camelot for your DJ software. Combine with BPM for full track prep.

Tips

Use a full section

Choruses with harmony detect best. Sparse intros or drums-only breaks confuse key.

Check relative

A minor and C major share notes. If the call feels off, the relative shown is the likely alternative.

Confirm by ear

Play the suggested scale over your track. Theory helps, ears decide.

FAQ

Which audio files work for key detection?

MP3, WAV, M4A, OGG and FLAC your browser can decode, up to about 50 MB. The first 60 seconds are analyzed, so use a harmonically rich chorus rather than a drums-only intro or silence for the strongest chroma signal.

How accurate is automatic key detection?

Strong on tonal pop, rock, house and hip-hop with clear harmony. Atonal passages, heavy chromaticism, key changes mid-song, or ambiguous relative major and minor splits lower confidence. High means the winning profile clearly beat 23 alternatives, low means play the suggested scale over your track to confirm.

What is the Camelot wheel?

A 1A to 12B DJ map of the 24 keys where A is minor and B is major. Same code, plus or minus one, or the relative pair mix without clashes. For example 8A A minor blends with 7A, 9A and 8B. The tool lists all four compatible codes for your result.

Is my audio uploaded anywhere?

No. Files decode via Web Audio and the 4096-point FFT chromagram plus Krumhansl-Schmuckler matching run locally. Clearing the file revokes the object URL and nothing is stored or sent.

What are compatible keys and relative major or minor?

Relative pairs share the same notes, like A minor and C major, and are the most common alternative when detection wavers. Compatible neighbors (same code, adjacent numbers, relative) share most pitches, so harmonic mixes stay smooth. Start with the same Camelot code, then try neighbors.

Should I use Key Finder or BPM Finder?

Use both for full track prep: BPM Finder gives tempo and beat grid, Key Finder gives key and Camelot. Together they answer what DJs need to plan transitions, which is tempo plus harmonic compatibility. Both run on the same file without uploads.

References

1. Web Audio API — MDN. developer.mozilla.org/Web/API/Web_Audio_API

2. Krumhansl-Schmuckler key profiles with chromagram analysis.

For practice and education. Timing accuracy depends on device performance and browser audio scheduling. For critical recording, compare with a hardware metronome.