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Find BPM

Free online MP3 tempo detector

MP3 BPM finder right in your browser

Drop an MP3 and read its BPM in about a second. The tempo appears to one decimal place with half-time and double-time alternatives, the musical key and its Camelot code, and a beat grid you can play and verify by ear.

20 MP3s per batch, no upload, no signup — everything runs locally in your browser.

Drop a song here to read its tempo

MP3, WAV, FLAC, M4A, OGG, AIFF — 20 files per batch, 100 MB each

No track analysed yet

Add a file on the left and its BPM, key and beat grid appear here — usually in under a second.

How to find the BPM of an MP3

Three steps, about a second per file, no software to install.

  1. Drop your MP3

    Drag an MP3 file onto the drop zone, click “Pick audio files” to browse, or paste from your file manager with ⌘V / Ctrl+V. You can add up to 20 MP3s at once for batch analysis, 100 MB each.

  2. Read the BPM

    The BPM of your MP3 appears to one decimal place within about a second. Half-time and double-time alternatives sit right below and switch with one click — the beat grid follows.

  3. Verify by ear

    Press Play and four beat dots pulse on the detected grid. Turn on the metronome click and a wrong tempo drifts audibly within a bar. Click anywhere on the waveform to jump ahead and spot-check a different section.

MP3 BPM detection at a glance

BPM range40–240 BPM, reported to one decimal place
Tempo alternativesHalf-time and double-time, switchable with one click
Also reportedMusical key, Camelot code, relative key, beat-clarity and key-match scores
Analysis windowUp to 3 minutes, taken from the middle of a longer file
Batch limit20 MP3s per batch, 100 MB each
Input formatsMP3 plus WAV, FLAC, M4A, AAC, OGG, Opus, AIFF, WebM
VerificationWaveform with bar lines, click-to-seek playback, metronome click on the detected grid
ExportCopy as text, batch CSV, or beat-grid CSV with every beat time
Processing locationYour browser — Web Audio decoding plus a Web Worker, nothing uploaded
PriceFree — no signup, no daily limit

MP3 BPM finder questions

How do I find the BPM of an MP3 file?
Drop the MP3 on this page. The analyser decodes it in your browser using the Web Audio API, detects the repeating beat pattern, and prints the BPM to one decimal place — usually in under a second. No account, no upload to a server.
Does the MP3 BPM finder work with other formats too?
Yes — WAV, FLAC, M4A, AAC, OGG, Opus, AIFF and WebM all work the same way. MP3 is the most common format people bring, but you can mix formats in a single batch.
Can I find the BPM of multiple MP3s at once?
Drop up to 20 MP3 files at a time and they are analysed one after another. Every result shows the BPM, key, Camelot code and beat-clarity score. Copy all results or export the batch as a CSV.
Is there a file-size limit for MP3s?
Each file can be up to 100 MB. A 320 kbps MP3 at that size is roughly 40 minutes of audio — long enough for almost any single track. The analyser samples up to 3 minutes from the middle of longer files for reliable detection.
Does the MP3 BPM finder also detect the key?
Yes — every analysis returns the musical key, its Camelot code and the relative major or minor alongside the BPM. If key detection is your main goal, try the key finder page, which puts the key in the headline.
Do my MP3 files get uploaded anywhere?
No. The browser decodes the MP3 locally and the analysis runs in a Web Worker on your device. No audio data, no filename and no result is ever sent to a server. Unreleased tracks and private demos are safe.
Why does my MP3 show half or double the BPM I expected?
Half-time and double-time are both musically valid tempos. A drum-and-bass track at 174 BPM is also a valid 87, and hip-hop at 85 is often counted as 170. The analyser picks the most likely count, and the alternatives below let you switch with one click.
Is the MP3 BPM finder free?
Completely free, no signup, no daily limit. BPM detection, key detection, Camelot codes, 20-file batches and CSV export are all included at no cost.

Why MP3 is still the format DJs and producers reach for

MP3 has been around since the early 1990s and remains the most widely used audio format on the planet. DJ pools deliver in MP3, most download stores default to it, and portable players still lean on its universal compatibility. When you need the BPM of a track, odds are the file sitting on your drive is an MP3.

Detecting the BPM of an MP3 works the same way as any other format: the browser decodes the compressed audio into raw samples, a beat-tracking algorithm finds the repeating pulse, and the result lands to one decimal. The lossy compression in MP3 does not affect accuracy — the beat pattern survives encoding at any bitrate a human would listen to.

Batch analysis is where an in-browser tool saves real time. Drop 20 MP3s from a DJ pool delivery or a sample pack and read every tempo at once, then export the list as a CSV. No software install, no account, no waiting for files to upload — the MP3 never leaves your machine.

Need the key alongside the tempo? The key finder shows the same results with the musical key in the headline — useful for harmonic mixing. For songs with no file to analyse, tap tempo turns your taps into a BPM.

Your MP3s stay on your device

The browser decodes each MP3 locally and the BPM analysis runs in a Web Worker beside it. No audio, no filename and no result is ever sent to a server. Unreleased tracks, client stems and private demos can go through it just as safely as anything in your library.