Free Online BPM & Key Finder for Any Song
Use this BPM & key finder to estimate any song's tempo and musical key. Your audio stays on your device from start to finish.
Choose your audio
MP3, WAV, FLAC, M4A, OGG or AAC · up to 100 MB
Drop an audio file here
or choose one from your device
TRACK ANALYSIS
Your results will appear here
One track. A fuller musical picture.
Choose a track with a clear beat and enough harmonic content for the strongest estimate.
Why use this BPM & key finder?
Get a practical tempo and key estimate with a fast, private browser-based workflow.
Tempo you can put to work
Estimate the track's beats per minute before you build a set, align a loop, or choose a session tempo. The analyzer listens for rhythmic events across the recording and returns a practical BPM reading without asking you to tap along manually.
A clear musical key estimate
See the most likely tonic and whether the track leans major or minor. That gives you a useful starting point for harmonic mixing, choosing compatible samples, transposing an idea, or checking a song by ear.
Audio stays on your device
The BPM & key finder analyzes audio locally in your browser. Your file is decoded and inspected on your device, never uploaded to Melodusk and never sent to an AI provider.
A focused one-file workflow
Choose a common audio file, run one analysis, and read the tempo, key, scale, and confidence together. There is no account gate, credit cost, or production setup between the file and the answer.
BPM estimate
Read the rhythmic pulse
Key and scale
Find the likely tonal center
Local processing
Keep audio on your device
How to use the BPM & key finder
No upload queue, account, or credits—just choose, analyze, and use the result.
Choose a track
Drop in a browser-supported audio file up to 100 MB.
Analyze locally
The tool reads rhythm and tonal features on your device.
Use the result
Take the estimated BPM and key into your mix, edit, or practice session.
Useful anywhere tracks need to fit together
Bring better context into DJ sets, production sessions, practice, and arrangement.
"I want to plan smoother transitions between tracks."
DJs can compare tempo and tonal center before arranging a set. The result gives you a quick reference for beatmatching and harmonic mixing, while your ears remain the final check for tracks with tempo drift or ambiguous tonality.
"I need a session tempo and key before I start editing."
Producers can inspect a reference, sample, or demo before setting the project tempo, choosing compatible material, or testing a transposition. It is a fast way to move from an unknown file to an informed starting point.
"I am learning a song and want a useful first clue."
Musicians can use the detected key and tempo to narrow down what they hear, configure a metronome, or choose a comfortable transposition. The estimate supports ear training rather than replacing it.
BPM & key finder questions
What to know before analyzing your first track.
Try the free online BPM & key finder
Find its likely BPM and musical key without uploading the audio.