Free by default
No credits, trial, account, ads, or artificial file limits. Open the page and start finding beats.
Free · private · browser-based
BPM Detector
Find the beat of any song in seconds. Your audio never leaves your device.
✓ No upload
✓ No account
✓ No file limit
Listening for beats…
Analyzing audio
—BPM
High confidence · Steady tempo
Other interpretations
Tap tempo
Not sure? Tap along to verify the beat.
Processing happens locally with the Web Audio API. We cannot access, store, or hear your file.
Three quick steps
How the BPM detector works
The analyzer turns rhythmic changes in your audio into a reliable tempo estimate—without sending a byte to a server.
- 01
Drop audio
Choose a song, loop, stem, or demo from your phone or computer. The file opens only inside your browser.
- 02
Analyze locally
The detector measures changes in energy, finds likely onsets, and compares repeating beat intervals.
- 03
Get the BPM
See the strongest tempo, a confidence estimate, and half- or double-time options. Tap along for a human check.
Built for the session
A faster, private BPM finder
DJs, producers, musicians, dancers, and video editors need a number they can use—not an account form or a catalog search. This free BPM finder analyzes your actual file.
Private processing
Your audio never leaves your device. That matters for unreleased demos, client work, and private recordings.
Works offline
Once this page is cached, the core tool can run without a connection. Handy in a booth, studio, or on the road.
Common formats
Analyze MP3, WAV, M4A, AAC, and OGG when the audio codec is supported by your browser.
Made for mobile
Large targets, a legible readout, and drag-and-drop alternatives make the tool comfortable on any screen.
Tempo context
Compare half-time and double-time values so the result matches the way you count the groove.
From waveform to pulse
What a tempo detector listens for
BPM means beats per minute: 120 BPM describes two beats every second. A tempo detector does not understand a song like a musician does. It looks for measurable events that often line up with the beat—kick drums, snares, claps, bass attacks, chord changes, and other sudden rises in energy.
This analyzer mixes the decoded signal to mono, samples a useful portion of the track, and builds an onset envelope from frame-to-frame energy changes. It then checks how strongly that envelope repeats across musically plausible intervals. The best-supported interval becomes the estimated BPM. A confidence score reflects how clearly the winning pulse stands above competing possibilities.
Tempo is sometimes ambiguous. A 70 BPM hip-hop groove can also be counted at 140 BPM; a sparse 128 BPM breakdown may suggest 64. That is not necessarily a detection error—it is a choice of metrical level. The half-time and double-time controls make that choice explicit, while Tap Tempo lets your ears make the final call.
Practical music data
Key BPM detector: what this tool tells you
BPM and musical key solve different problems. Tempo describes speed; key describes the tonal center. This first version is a focused BPM analyzer, so it does not guess a key and pretend the answer is certain. For harmonic mixing, use the detected tempo here and confirm key with a dedicated chroma-based key analyzer or your DJ software.
Accurate BPM helps DJs align grids and transitions, producers time-stretch samples, musicians set a metronome, and editors cut visual changes to a pulse. For the cleanest result, analyze a section with steady drums. Tracks with rubato, tempo changes, very soft percussion, or unusual time signatures may need a manual tap check.
Useful answers
BPM detector FAQ
How do I use the BPM detector with an MP3?+
Drop an MP3 onto the analyzer or choose it from your device. Your browser decodes and analyzes it locally, then displays an estimated BPM and confidence level. Nothing is uploaded.
Can I use the BPM detector by tapping?+
Yes. Press Tap—or the space bar when you are not focused on another control—in time with at least four beats. The readout averages recent intervals, which is useful for checking the automatic result.
Is this a live BPM detector?+
It analyzes complete audio files immediately in your browser. It does not continuously listen through your microphone, so it is live local analysis rather than live room monitoring.
Can it detect BPM from a YouTube link?+
No. This tool does not download or extract audio from YouTube. Use an audio file you own or have permission to analyze, then drop that file into the detector.
Does the BPM detector use my microphone?+
No microphone permission is requested. If a song is playing nearby, use Tap Tempo while listening.
Which audio formats work?+
MP3 and WAV have broad support. M4A, AAC, and OGG depend on the codecs built into your browser and operating system. If a format cannot be decoded, converting it to WAV is the most reliable fix.
Why is the result half or double the tempo I expect?+
Half-time and double-time rhythms share related beat spacing. Use the alternate values below the result or Tap Tempo to choose the interpretation that matches how you count the music.
Is the BPM analyzer private and free?+
Yes. It is free, has no ads, and processes audio inside your browser. Your audio never leaves your device.
Hear it. Measure it. Use it.