How accurate is the BPM detection?

It uses librosa beat tracking, which is accurate for most modern music with a steady beat. Songs with tempo changes, rubato, or very sparse percussion can be harder to detect, and may return half or double the true tempo.

Does it also detect the key?

Yes. Alongside BPM we estimate the tonal center (root note) using chroma analysis. For full key + scale detection try our dedicated Key Detector.

What file formats are supported?

MP3, WAV, FLAC, M4A, OGG, AAC, WebM, and Opus, up to 100 MB and 15 minutes.

Do you store my uploaded file?

No. The file is analyzed and deleted immediately — it never enters our job storage and is never used for AI training.

Free Online BPM Detector — Find Any Song's Tempo

Q: Is this BPM detector free?

Yes, completely free with no signup and no daily quota. It is rate-limited only to prevent abuse.

Drop a song and get its BPM (beats per minute) and musical key in a few seconds. No signup, no quota, no watermark — analyzed on our private GPU server and deleted instantly.

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Drop a song here, or click to choose

MP3 · WAV · M4A · FLAC · OGG · WebM · Opus · ≤ 100 MB

How to find a song's BPM

Upload the song — drag it onto the box above or click to choose a file.
Wait a few seconds while our server runs beat-tracking analysis (librosa) on the audio.
Read the tempo — the BPM, estimated key, and duration appear instantly. Nothing to install.

Why detect BPM?

DJs — beatmatch and plan transitions by knowing each track's tempo.
Producers — match a sample or acapella to your project tempo before chopping.
Dancers & instructors — pick songs at the right speed for choreography or class.
Runners & cyclists — build playlists that match your cadence.
Musicians — set your metronome to practice along with a recording.

Accuracy & tips

The detector uses librosa beat tracking, which works well for music with a steady, audible beat. For songs with tempo changes, free-time intros, or very sparse percussion, the result can occasionally land on half or double the true tempo — if 70 BPM looks too slow, try 140 (and vice-versa). For a cleaner reading on busy mixes, you can first extract the instrumental or isolate the drums-heavy stem and analyze that.

Frequently asked questions

Is this BPM detector free?

Yes — completely free, no signup, no daily quota. It's only rate-limited to prevent abuse.

How accurate is it?

Accurate for most modern music with a steady beat. Tempo changes, rubato, or sparse percussion can cause half/double-time results.

Does it detect the key too?

Yes — it estimates the tonal center (root note). For a key-focused view use the Key Detector.

What formats can I upload?

MP3, WAV, FLAC, M4A, OGG, AAC, WebM, Opus — up to 100 MB / 15 minutes.

Do you keep my file?

No. It's analyzed and deleted immediately, never stored or used for training.

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