BPM Detector Online
Upload a song and get its exact BPM, musical key, and Camelot code in seconds. Free, no sign-up — made for DJ sets, remixes, playlists, and practice.
Drop a song to find its BPM & key
MP3, WAV, M4A, FLAC… up to 40 MB
…or click anywhere in this box to browse files
How to Find the BPM of a Song
No account needed. Drop a song and read the numbers.
Upload the Song
Drag and drop a song onto the tool or click to browse — MP3, WAV, M4A, FLAC, OGG, or AAC up to 40 MB.
Detect BPM & Key
Hit Detect BPM & key. The song is analyzed on our servers — usually just a few seconds.
Read the Three Cards
The BPM, the musical key, and the Camelot code appear right on the page — ready to copy into your set list or project.
Why Notevibes BPM Detector
Three answers from one upload — fast, honest, and private.
Exact BPM, Not a Guess
The analysis measures the actual beat of the recording and returns the tempo as a number — no tapping along, no rounding by ear.
Key + Camelot Code
Alongside the BPM you get the musical key and scale (like A minor) and its Camelot code (8A) — the notation DJs use for harmonic mixing.
Results in Seconds
Analysis runs on our servers and usually comes back in just a few seconds, even for a full-length song.
Private by Design
Your song is analyzed on our own Google Cloud servers and deleted automatically right after — only the numbers come back to the page.
Free, No Sign-Up
No account, no credits, no paywall. A generous fair-use limit — several files per minute — keeps the tool free for everyone.
Works on Mobile
Check a song's BPM and key on your phone or tablet. Runs on iOS, Android, Chrome, Firefox, Safari, and Edge.
What Happens to Your File
Your song is uploaded over an encrypted connection, analyzed on our own Google Cloud servers, and deleted automatically the moment the analysis finishes. Only the numbers come back.
No Storage
Deleted right after analysis
No Account
Start detecting immediately
No Third Parties
Runs on our own servers only
What You Can Do With BPM & Key
Every upload returns the tempo, the key, and the Camelot code.
DJ Harmonic Mixing
Pick the next track by Camelot code so the keys blend instead of clash
Tempo-Matched Playlists
Build running, workout, or party playlists that hold a steady BPM
Remix & Mashup Prep
Check two songs share a tempo and compatible keys before you blend them
Practice Metronome
Set your metronome to the song's exact BPM when learning or rehearsing it
Sample Matching
Find a sample's tempo and key so it drops into your project in time and in tune
Music Library Labeling
Tag your collection with BPM and key so the right track is one search away
Stop Tapping Along to Guess the Tempo
You know the routine: play the song, tap along on a metronome app, and hope you kept time. And even when the tempo lines up, a mashup can still fall apart because the keys don’t fit and the two songs grind against each other. This tool answers both questions at once — upload a song, and a few seconds later you have the exact BPM, the musical key, and the Camelot code.
One upload, three answers
The result comes back as three cards: the tempo in BPM, the key and scale (say, A minor), and the matching Camelot code (8A). The Camelot wheel is DJ shorthand for which keys fit — adjacent numbers on the wheel mix well together, so picking a harmonically compatible next track is as easy as reading two codes. Under the hood it’s the same analysis engine the Notevibes editor uses, measuring the actual beat and harmonic content of your recording rather than guessing from a title or a tag.
Honest about accuracy
Tempo detection is very reliable — on music with a steady beat, the number you get is the tempo of the record. Two honest caveats. Songs with a strong half-time or double-time feel can read at half or double the tempo you’d tap, so if 140 comes back as 70, just double it. And key detection is a strong starting point rather than a verdict: most clearly tonal songs come back right, but on ambiguous or heavily layered material, trust your ears over the label.
Your music stays yours
Your file uploads over an encrypted connection, is analyzed on our own servers, and is deleted automatically the moment the numbers come back. Nothing is stored, shared, or used to train AI — and there’s no sign-up, just a generous fair-use limit of several files per minute that keeps the tool free for everyone.
What to do with the numbers
Once you know the tempo and key, the rest of the toolkit picks up where the detector leaves off. Retime a track without changing its pitch with the tempo changer, shift a song to your set’s tempo with the BPM changer, pull the drums or vocals out for a remix with the stem splitter, or tune a vocal to the detected key with online autotune.
Need More Than a BPM Detector?
The full Notevibes Online Audio Editor lets you trim clips, mix multiple tracks, add fades, clean up podcasts, apply voice EQ, and export to MP3 or WAV — all in your browser.
Free to try · No credit card required
Related Audio Tools
More free AI audio tools from Notevibes — same engine, no sign-up.
Audio Tempo Changer
Speed up or slow down while keeping pitch unchanged.
Audio Speed Changer
Speed up or slow down audio from 0.5x to 2x.
AI Stem Splitter
Split any song into vocals, drums, bass, and other.
Online Autotune
Pitch-correct a vocal to the classic hard-tune sound.
Audio Pitch Changer
Shift pitch up or down without changing duration.
Note Identifier
Sing or play a note and see its name instantly.
BPM Detector FAQ
How does the BPM detector work?
Your song is uploaded over an encrypted connection and analyzed on our own Google Cloud servers. The analysis measures the beat of the recording to find the tempo and its harmonic content to estimate the key, then returns three results — the BPM, the key and scale, and the Camelot code — usually in just a few seconds.
Is the BPM detector free?
Yes. No sign-up, no credits, no paywall — the results appear right on the page. To keep it free for everyone there is a generous fair-use limit of several files per minute, and files are capped at 40 MB.
How accurate is the BPM?
Very reliable on music with a steady beat — pop, rock, electronic, and hip-hop almost always come back with the tempo of the record. The one classic ambiguity: songs with a strong half-time or double-time feel can read at half or double the tempo you would tap. If 140 comes back as 70, just double it.
How accurate is the key detection?
It is a strong starting point rather than a verdict. Most clearly tonal songs come back with the right key, but ambiguous, modal, or heavily layered material can fool any key detector — relative major and minor keys are the most common mix-up. Use the result to narrow it down, then trust your ears.
What is a Camelot code?
The Camelot wheel is DJ shorthand for musical keys: each key gets a number from 1 to 12 plus a letter — A for minor, B for major — so A minor becomes 8A. Adjacent numbers on the wheel mix well together, which makes picking a harmonically compatible next track as easy as reading two codes.
What file formats are supported?
MP3, WAV, M4A, FLAC, OGG, and AAC up to 40 MB. Mono and stereo files both work — the analysis only reads the audio, so nothing is converted or changed.
What happens to my file?
It is uploaded over an encrypted connection, analyzed on our own Google Cloud servers, and deleted automatically right after the analysis finishes. Only the numbers come back to the page — the audio is never stored, shared, or used for training.