Know the BPM and key of any song.
Upload any MP3 and instantly detect its tempo in beats per minute and its musical key. No software, no plugins. Powered by librosa AI audio analysis for accurate results across all genres in seconds.
Analyze a track
BPM & Key Finder
Upload any MP3 and instantly detect the tempo in BPM and the musical key. Powered by librosa AI audio analysis for accurate results across all genres.
Output
BPM & Key Finder
Your audio will appear here
Upload an audio file and click Analyze Track.
Instant tempo detection
Get the exact BPM of any track in seconds. Upload your MP3 and the AI analyzes the beat structure across the entire track to give you an accurate tempo reading — even for tracks with dynamic rhythms.
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Detect the musical key
Know exactly what key a song is in — major or minor — without playing a note. Useful for finding compatible tracks to mix, writing harmonically matching chord progressions, or transposing a song to a singable range.
Find the key
Works on any genre
From electronic and hip-hop to jazz and classical. The AI identifies beat patterns and harmonic content regardless of production style, instrumentation, or tempo range — from slow ballads to fast drum and bass.
Analyze a track
Results in seconds
Unlike stem splitting or vocal removal, BPM and key analysis is fast. Most tracks return results within a few seconds of upload, so you can keep your workflow moving without waiting.
Start analyzingWho Uses BPM & Key Finder
DJs and beatmatchers
Find the BPM of every track in your library so you know exactly which songs can be mixed together without manual beatmatching. Build playlists sorted by tempo for seamless set transitions.
Music producers and beatmakers
Sample a track or write a chord progression that sits perfectly in the same key. Knowing the BPM and key before you start saves time and keeps everything harmonically and rhythmically compatible.
Musicians and songwriters
Quickly figure out the key of a song you want to cover or play along to. Match your instrument to the right key and tempo without spending time working it out by ear.
Music educators and students
Verify key and tempo assignments for theory exercises, or check student transcriptions against the real values. A fast reference tool for any classroom or practice session.
How BPM & Key Finder works
From upload to tempo and key in seconds
Upload your MP3
Upload any MP3 audio file. Your file is stored securely in your workspace and you can re-analyze it at any time.
AI analyzes the track
The AI scans the beat structure to calculate the tempo in BPM and analyzes the harmonic content using the Krumhansl-Schmuckler algorithm to identify the musical key.
Get your BPM and key
Results are returned in seconds. You see the exact BPM, the musical key (root and mode), and a confidence score so you know how reliable the key detection is.
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Frequently Asked Questions
Everything you need to know to get started.
What is BPM?
BPM stands for beats per minute. It measures the tempo of a track — how fast or slow it is. A tempo of 120 BPM means there are 120 beats every minute. Most dance music sits between 120 and 140 BPM, while hip-hop is often 80 to 100 BPM.
What is the musical key of a song?
The musical key tells you the tonal center of a track — which note everything resolves to — and whether the overall mood is major (brighter) or minor (darker). For example, "A minor" means the track is built around the note A in the natural minor scale.
How accurate is the BPM detection?
For most electronically produced music with a consistent beat, BPM detection is very accurate. For live recordings, jazz, or tracks with tempo changes, there may be slight variations. The tool analyzes the whole track and returns the dominant tempo.
How accurate is the key detection?
Key detection uses the Krumhansl-Schmuckler algorithm, which compares the harmonic content of the track against established key profiles. A confidence score is included with every result so you can judge reliability. Heavily chromatic, atonal, or modulating tracks may return lower confidence.
What audio formats can I upload?
MP3 is the primary supported format. The underlying analysis engine can handle most audio formats that FFmpeg supports, including WAV and AAC.
How long does analysis take?
Most tracks return BPM and key results within a few seconds of upload. Unlike stem separation or vocal removal, audio analysis is lightweight and fast regardless of track length.
Find the BPM and key of any track instantly.
Upload an MP3 and get accurate tempo and key detection in seconds. No software to install.
Open BPM & Key FinderDisclaimer: This tool uses generative AI technology which may produce content that resembles copyrighted materials or that is inaccurate, incomplete, or out-of-date. It is provided for general information and educational purposes only and is not intended for illegal activities or to replace professional advice, diagnosis, or treatment. Users are solely responsible for how they use the generated content. If you plan to use AI-generated content commercially or publicly, we strongly recommend reviewing it for potential copyright issues and obtaining proper permissions where necessary. We accept no liability for copyright infringement or any other consequences resulting from the use of content generated by this tool.