Music Key Detector

About Music Key Detector

How to use Music Key Detector

1. Drag and drop an audio file (MP3, WAV, M4A, OGG, WebM, etc.) onto the drop zone in the center of the screen, or click to browse and select a file.
2. Once the file is loaded, an 'Analyze' button appears. Click it to begin automatic FFT analysis via the Web Audio API.
3. When analysis completes, the detected main key (e.g., C Major, A Minor) is displayed prominently along with a confidence percentage.
4. Additionally, a pitch class distribution chart for all 12 notes and a ranked list of the top 5 key candidates are shown, helping you evaluate ambiguous or multi-tonal tracks.

Benefits of Music Key Detector

• [High-Accuracy Detection Based on Krumhansl-Kessler Theory]: By employing correlation analysis against tonal profiles derived from empirical music psychology research, this tool achieves reliable key identification including major/minor distinction—far superior to simple peak detection. The confidence score lets you instantly assess result certainty.
• [Complete Browser-Side Processing for Privacy]: All audio analysis runs entirely within browser JavaScript (Web Audio API + OfflineAudioContext), meaning your audio files are never transmitted to any external server. You can safely analyze unreleased tracks and work-in-progress demos.
• [12-Note Pitch Class Distribution Visualization]: Beyond just the detected key, the tool visualizes the intensity of all 12 pitch classes (C through B) in a bar chart. This provides intuitive insight into a track's harmonic structure, useful as reference material for composition and arrangement.
• [Top 5 Candidate Ranking for Multi-Angle Analysis]: In addition to the primary key, the top 5 key candidates ranked by correlation score are displayed. This helps you compare multiple possibilities for tracks with frequent modulations or complex modal interchange.