Detect BPM & Key
in Seconds

Drop any track or demo and instantly get tempo (BPM) + musical key so you can produce faster, DJ smarter, and finish more music.

  • Works with MP3 / WAV - drag & drop or browse
  • Built for producers, artists, DJs & creators
  • 100% private - audio never leaves your browser

BPM/Key Analysis

100% private - runs locally in your browser

Drop audio here

BPM

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Beats per minute

Key

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Musical key signature

100% Private
Free & Unlimited
Instant Results

Used by creators who don't want guesswork.

Stop tapping tempo. Stop "pretty sure it's in A minor." Get clarity and keep moving.

Free
Private
Instant

What You'll See in Your Results

Two key pieces of information - analyzed instantly and privately on your device.

BPM (tempo)

Ideal for aligning drums, loops, and setting your DAW project tempo to match the track.

e.g., 128 BPM

Key + Scale

Know the musical key to pick compatible samples, tune your 808s, or harmonize vocals correctly.

e.g., F# minor / A major

Got the BPM + key? Now make it release-ready.

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How it Works

Get BPM and key detection in three simple steps - no uploads, no servers, fully private in your browser.

1

Drop your audio file

Drag & drop any audio file into the analyzer.

Works with MP3, WAV, and other common formats.

Runs entirely in your browser - no uploads, no servers.

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2

Instant local analysis

Our engine detects BPM (beats per minute) from the audio waveform.

Key detection identifies the musical key and scale.

Everything happens on your device - your audio never leaves your browser.

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3

Copy & use your results

View your BPM and key results instantly.

Copy values to paste into your DAW or session notes.

Use the info to set project tempo, find compatible samples, or prep for DJ sets.

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Results are estimates - perfect for workflow speed.

Why This Helps

BPM and key detection saves time for every type of creator.

For Producers

You're building tracks and need the technical details fast.

  • Set your DAW tempo instantly
  • Find the right 808/bass notes faster
  • Pick the right vocal tuning / harmony direction

For Artists

You're collaborating or re-recording and need accurate info.

  • Share accurate session info with collaborators
  • Re-record confidently in the right key
  • Avoid "why does this hook feel off?" moments

For DJs / Mashups

You're mixing tracks and need compatibility info.

  • Build clean transitions with BPM
  • Prep edits without guessing
  • Find compatible tracks faster

100% Private. Your Audio Never Leaves Your Device.

We built this tool to run entirely in your browser - no uploads, no servers, no exceptions.

Your audio never leaves your device - all analysis runs locally in your browser

No uploads to our servers - we can't see or access your files

Nothing to delete - your audio stays on your machine the entire time

From "What key is this?" to "This is release-ready."

BPM and key are the first two questions in almost every session. When you're ready for the next step, Cryo Mix helps you mix + master with speed by default-and control when it counts.

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FAQ

Common questions about BPM & key detection.

It's highly reliable for most modern music, but some tracks (live recordings, heavy swing, key changes, dense harmony) can be ambiguous. Use results as a fast starting point - then trust your ears.
Yes. Results may vary depending on how rhythmic/harmonic the audio is. Instrumental tracks with clear rhythmic patterns tend to give the most accurate BPM results, while vocals with sustained notes work well for key detection.
Yes - though very short loops can reduce confidence. Longer audio usually improves results. We recommend at least 15-30 seconds of audio for the most reliable detection.
No. All audio processing happens entirely in your browser using local computation. Your files never leave your device, and we have no access to your audio whatsoever. Nothing is uploaded to any server.
Absolutely - set the tempo, choose compatible instruments, or tune your vocal processing confidently. Just copy the BPM value and paste it into your DAW's tempo field, or use the key to inform your sample selection and harmonic decisions.

Need more info?

Check out our Help Center