Key & BPM Finder
Instantly detect the musical key and BPM (tempo) of any song or audio file. 100% free, no account required. Powered by AI audio analysis.
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Supports MP3, WAV, FLAC, OGG, M4A, AAC, AIFF, WMA. Max 50MB.file.mp3
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Detecting key signature, tempo, and musical characteristicsCamelot Wheel Position
Compatible Keys for Mixing
| Detected Key | -- |
| Relative Key | -- |
| Parallel Key | -- |
| Scale Notes | -- |
| Exact BPM | -- |
| Half / Double BPM | -- |
| Open Key Notation | -- |
| Track Duration | -- |
Analysis History (This Session)
| Track | Key | Camelot | BPM | Tempo |
|---|
How It Works
- Upload any audio file (MP3, WAV, FLAC, OGG, M4A, AAC, AIFF, or WMA)
- Our AI analyzes the spectral and rhythmic content of the audio waveform
- Key detection uses chromagram analysis to identify the tonal center and mode
- BPM detection uses onset detection and autocorrelation for precise tempo measurement
- Results include Camelot codes, confidence scores, scale notes, and harmonic data
Tempo Reference Guide
| Category | BPM Range | Typical Genre |
|---|---|---|
| Largo | 40-60 | Ambient, Drone |
| Adagio | 60-80 | Ballads, Downtempo |
| Andante | 80-100 | Hip Hop, R&B |
| Moderato | 100-120 | Pop, Reggae |
| Allegro | 120-140 | House, Techno, EDM |
| Vivace | 140-170 | Drum & Bass, Dubstep |
| Presto | 170-200+ | Speedcore, Gabber |
Camelot Wheel Guide
The Camelot Wheel is a tool DJs and producers use for harmonic mixing. Each key is assigned a number (1-12) and letter (A for minor, B for major). For harmonically compatible transitions, mix tracks that are:
- Same code (e.g., 8A to 8A) - Perfect harmonic match, zero tonal clash
- Adjacent numbers (e.g., 8A to 7A or 9A) - Smooth key transition with minimal tension
- Same number, switch letter (e.g., 8A to 8B) - Minor to major energy shift, great for build-ups
- Plus one, switch letter (e.g., 8A to 9B) - Energy boost with dominant key resolution
Used by Rekordbox, Traktor, Serato, Mixed In Key, and VirtualDJ.
Supported Formats
Maximum file size: 50MB. For best results, use high-quality audio files (WAV or FLAC). Higher quality input yields more accurate key and BPM detection.
Tips for Accurate Results
- Use high-quality source files (WAV or FLAC) for best accuracy
- Full-length tracks give more reliable results than short clips
- Songs with clear harmonic structure are easier to analyze
- If BPM seems wrong, check the half/double time suggestions
- Songs that modulate (change key) may show the dominant key
How Key & BPM Detection Works
Advanced audio analysis algorithms examine the spectral and rhythmic characteristics of your music to determine its tonal center and tempo with high precision.
Upload Your Files
Drag and drop any audio file onto the upload area, or click to browse your files. We accept all major audio formats including MP3, WAV, FLAC, OGG, M4A, AAC, AIFF, and WMA. Files up to 50MB are supported for thorough analysis of complete tracks.
AI Analyzes the Audio
Our engine performs chromagram analysis to identify pitch classes and determine the tonal center and mode. Onset detection and autocorrelation algorithms precisely measure the tempo. The analysis runs server-side on GPU hardware for speed and accuracy, typically completing in 2-5 seconds.
View Complete Results
See the detected musical key (major or minor), BPM with decimal precision, Camelot code for DJ mixing, Open Key notation, tempo category, scale notes, relative and parallel keys, and confidence percentages. Copy results or analyze more tracks to build a session history for setlist planning.
Voice Recorder Use Cases
A browser-based voice recorder is useful for countless scenarios, from quick voice memos to professional reference recordings.
DJing & Harmonic Mixing
The foundation of great DJ sets is harmonic mixing. Know the key and BPM of every track in your library so you can create seamless transitions between songs. Use Camelot codes to instantly identify compatible tracks. Mix in key to keep your audience engaged without dissonant clashes between songs. Essential for Rekordbox, Traktor, Serato, and VirtualDJ users who want to tag their libraries accurately.
Professional Audio Production
Convert compressed audio to lossless WAV or AIFF for editing in DAWs like Ableton, FL Studio, and Logic Pro. Ensure you work with the highest quality source material for mixing and mastering. Convert final masters to multiple delivery formats for distribution.
Mashups & Remixing
Creating mashups requires knowing the exact key and BPM of both source tracks. Use our tool to identify compatible songs, then pitch-shift or time-stretch as needed. The Camelot system makes it easy to find songs that will blend naturally, even across different genres and decades. Analyze entire playlists to find the best mashup candidates.
Karaoke & Vocal Performance
Find the key of any song to determine if it falls within your vocal range. Singers and vocal coaches use key detection to identify whether a track needs to be transposed up or down for a comfortable performance. Essential for karaoke hosts who need to quickly adjust songs for different singers at live events.
Music Education & Theory
Music students and teachers use key and BPM detection for ear training, music theory exercises, and analyzing compositions. Verify your ability to identify keys by ear, study the tempo patterns of different musical eras and genres, and build a deeper understanding of harmonic structure across the repertoire you
Video Editing & Content Creation
Content creators and video editors use BPM data to sync cuts, transitions, and effects precisely to the beat of background music. Knowing the tempo ensures your visual edits land on musical beats, creating more professional and engaging video content for YouTube, TikTok, Instagram Reels, and other platforms.
Why Use Our Free Voice Recorder?
Precise Key Detection
Our key detection algorithm uses chromagram analysis, which maps audio frequencies to the twelve pitch classes of the Western chromatic scale. By analyzing the distribution and prominence of these pitch classes across the entire track, we determine the most likely tonal center and whether the piece is in a major or minor key. The algorithm handles complex harmonies, key changes, and modal ambiguity, providing confidence scores so you know how certain the result is.
Accurate BPM Detection
Tempo detection combines onset detection (identifying the start of musical events like drum hits and note attacks) with autocorrelation and spectral flux analysis to find the dominant periodicity in the audio. Our algorithm accurately handles complex rhythms, syncopation, tempo changes, and genres with ambiguous beat patterns. Results include decimal-precision BPM values and half/double time alternatives for genres like drum and bass or hip-hop where the perceived tempo can differ.
Camelot & Open Key Notation
Every detected key is automatically converted to both Camelot notation (used by Mixed In Key, Rekordbox, Traktor, and Serato) and Open Key notation. This makes it effortless to identify harmonically compatible tracks for mixing. The Camelot system assigns each key a number from 1-12 and a letter (A for minor, B for major), so compatible keys are always adjacent on the wheel. We also show relative keys, parallel keys, and compatible key lists.
Completely Free & Unlimited
Unlike other key and BPM detection tools that limit free usage or require subscriptions, our Key & BPM Finder is completely free with no limits. Analyze as many tracks as you want, as often as you want, with no account required. No credits consumed, no watermarks, no hidden restrictions. All processing happens on our servers, so it works on any device with a browser, including phones and tablets.
Frequently Asked Questions
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