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Check Key Compatibility
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Read Audio TagsAnalyze the musical and camelot key of your audio files for free. No audio is stored, and all analysis is done locally in your browser.
or click to import
How to find a song's key online
Import your audio file using the tool above: drag and drop it onto the upload area or click to pick a file. The Key Finder will analyze the track in under 2 seconds and display both the musical key and its Camelot Wheel equivalent. You can add multiple files at once and copy each result with one click.
What is musical key in music
A track's musical key is the set of notes and chords that form its harmonic foundation, for example A minor or C major. Every key has a characteristic mood: minor keys tend to feel darker or more emotional, while major keys feel brighter and more uplifting. Knowing a track's key is essential for harmonic mixing, music production, and composition.
Why DJs use key detection for harmonic mixing
Harmonic mixing is the practice of blending tracks whose keys are musically compatible, so melodies and chords complement each other rather than clash. The Camelot Wheel simplifies this: tracks with adjacent numbers (e.g. 8A / 9A or 8A / 8B) mix harmonically. Combined with accurate BPM matching, key detection is one of the most powerful tools in a DJ's workflow.
Frequently asked questions
How accurate is the online key detection?
Very accurate. The Key Finder uses professional-grade harmonic analysis algorithms, the same engine that powers our Key Finder app on Mac, iPhone, and iPad. Detection completes in under 3 seconds per track.
What is Camelot Wheel notation?
The Camelot Wheel is a system that maps musical keys to numbers and letters (e.g. 8A for A minor, 8B for C major) to make harmonic mixing easier. Tracks with adjacent Camelot numbers mix harmonically, so DJs use it to find compatible tracks quickly. The Key Finder displays both standard musical notation and the Camelot equivalent.
Can I use the Key Finder on my phone or tablet?
Yes, this web tool works on any device with a modern browser, including phones and tablets. For a faster offline experience, the Key Finder app is available on the App Store for iPhone, iPad, and Mac. Processing tracks 5x faster with no internet required.
What audio file formats are supported?
Most common audio formats are supported, including MP3, WAV, AAC, M4A, FLAC, AIFF, and OGG. Simply drag and drop files onto the tool or click to open the file picker.
Why is knowing a track's key important for DJs?
Knowing a track's key is essential for harmonic mixing, blending tracks that are musically compatible so that melodies and chords sound good together rather than clashing. Combined with BPM for beatmatching, key detection allows DJs to create smooth, professional-sounding transitions that keep the energy flowing on the dancefloor.