Free Online BPM & Key Finder

Free BPM and Key Finder for Any Song

Find the BPM and key of any song online. Upload MP3, WAV, FLAC, loops, samples, or acapellas to detect tempo, musical key, Camelot code, and duration privately in your browser.

Free online BPM finder and song key finder for MP3, WAV, FLAC, M4A, AAC, and OGG files. Batch analysis runs locally in your browser with no server upload.

Useful next tools

Continue the workflow after checking tempo, key, and Camelot code.

Producer Tag GeneratorCreate custom producer tags with text-to-speech, voice effects, and cloned voices.

Pitch ChangerShift audio pitch up or down by semitones, privately in your browser.

Tempo ChangerChange music speed without changing pitch. Slow down or speed up locally in your browser.

Overview

What BPM and Key Finder Does

TagMyBeat reads local audio files and returns the track tempo, musical key, Camelot code, and duration in one browser-based results table. Use it before remixing, DJ crate prep, sample tagging, or matching beats and acapellas without uploading unreleased audio.

Good fit	Not ideal for
Full songs, beats, drum loops, sample packs, acapellas, and unreleased demos	Live recordings with tempo drift, free-time intros, spoken-word files, and very short clips
Checking BPM, musical key, Camelot code, duration, and export-ready metadata in one pass	Songs with multiple key changes, ambiguous harmony, or sections that intentionally switch tempo

Workflow

How to Use This BPM Finder and Song Key Finder

1
Upload your song, loop, or sample
Drag and drop, or click to browse, one or many tracks in MP3, WAV, FLAC, M4A, AAC, or OGG. Songs, beats, samples, drum loops, and acapellas stay on your device because nothing is uploaded to a server.
2
Let the browser BPM and key finder run
The page loads the analysis engine on demand, then validates, decodes, and analyzes each file in your browser. Batch mode processes files one after another and keeps progress visible.
Example output while the browser analyzes your tracks and fills the results table.
3
Review BPM, key, Camelot, and duration
Every track is listed with title, detected BPM, musical key with major or minor scale, Camelot code for harmonic mixing, duration, and live status so you can confirm the results before using them.
4
Copy the table or export CSV results
Use Copy Table to paste a TSV block into Notion, Google Sheets, or DAW session notes, or export CSV results when you need the full batch in a spreadsheet or crate prep document.

Comparison

Which BPM and Key Finder Should You Use?

We compare tools by privacy, local file support, batch export, and best-fit workflow. TagMyBeat is our own product, so use this as a decision guide and verify critical DJ or release decisions by ear.

Tool	Best for	Price	Privacy	Batch workflow
TagMyBeat	Private browser-based analysis of local songs, samples, acapellas, and unreleased beats	Free	Runs in your browser, offline	Yes, with CSV and TSV export free for any number of files
Tunebat	You need sentiment analysis of your music	Partially Free	Runs in your browser, you must be online	No local batch export workflow, export is not free
SongBPM	Quick public song tempo lookups when you know the released track title	Free	Search-based public catalog	No local file batch analysis
Mixed In Key	Professional DJ library management and deeper preparation inside a paid desktop workflow	Paid	Desktop app workflow	Yes, for managed libraries

Choose TagMyBeat when you need a free browser BPM and key finder for private local files. Choose Mixed In Key when you want a paid desktop DJ library workflow, and choose SongBPM when you only need to look up released songs by title.

Use Cases

What People Use BPM and Key Finder For

DJ crate prep

Drop a folder of local tracks, review BPM, key, and Camelot code, then export CSV for spreadsheet cleanup before you build a set.

Producer sample tagging

Analyze loops, one-shots, and beat ideas before importing them into your DAW so folders are labeled with usable tempo and key notes.

Remix and acapella matching

Check an acapella and a beat in the same batch, compare Camelot codes, then confirm by ear before committing to a remix key.

Practice and remix prep

Detect BPM and Camelot code first, then open Tempo Changer for practice-speed exports, Slowed and Reverb Maker at /tools/slowed-reverb-maker for vibe edits, or Pitch Changer for harmonic shifts.

Beat pack metadata cleanup

Upload exported beats, copy the table into Notion or Google Sheets, and keep BPM, key, and duration next to each track title.

FAQ

Frequently Asked Questions

Based on user feedback, last updated May 2026.

▼How do I find the BPM of a song online?

Upload the song file, wait for the browser analysis to finish, then read the detected BPM in the results table. The tempo is an estimate, so tracks with free-time intros, tempo changes, or very sparse drums may need manual confirmation.

▼How do I find the key of a song?

Upload a local audio file and review the detected musical key, scale, and Camelot code. Key detection can be less reliable when a song modulates, has an ambiguous tonal center, or mixes major and minor cues.

▼Can I find BPM and key at the same time?

Yes. TagMyBeat analyzes each file once and returns BPM, musical key, Camelot code, duration, and export-ready rows together. Drop several files to process them one after another in your browser.

▼Is this an MP3 BPM finder and key finder?

Yes. You can upload MP3 files, plus other browser-decodable audio formats such as WAV, FLAC, M4A, AAC, and OGG. Browser decoding support can vary, so a converted MP3 or WAV is the safest fallback if a file will not open.

▼Can I analyze multiple songs at once?

Yes. Drop several local audio files and the browser processes them one after another. Batch results include title, BPM, key, Camelot code, and duration.

▼Can I use the Camelot code for DJ harmonic mixing?

Yes. The Camelot code is included to help compare compatible keys for DJ transitions, mashups, and acapella matching. Treat it as a practical guide and still listen for clashes when tracks have complex harmony or key changes.

▼Why does the detected BPM look half-time or double-time?

Some songs can be felt at half-time or double-time, especially trap, drum and bass, or sparse loops. If the detected BPM feels too slow or too fast, try doubling or halving it and choose the value that matches your grid or DJ software.

▼Why can two key finder tools show different keys?

Different key finder tools use different algorithms and can disagree when a song modulates, has a weak tonal center, or blends major and minor cues. If two tools disagree, use the detected Camelot code as a hint and confirm by ear against the track you want to mix with.

▼Does my audio file get uploaded to a server?

No. All detection runs locally in your browser, so the audio file does not leave your device. That makes the tool suitable for unreleased beats, client demos, and private sample folders.

▼Can I export the results to my DAW or spreadsheet?

Yes. Copy Table pastes a TSV block into Notion, Google Sheets, Excel, or DAW session notes, and Export CSV downloads the full batch. The export includes title, BPM, key, Camelot code, and duration so you can keep crate prep or sample tagging organized.

▼Can I find the BPM and key of a YouTube or Spotify song?

No. The tool only reads local audio files, so YouTube and Spotify streams cannot be analyzed directly. Export or render a file you have the right to use, then upload that local MP3, WAV, or other supported format.

▼How We Built BPM and Key Finder

Most online BPM and key finder tools run directly in the browser, and TagMyBeat follows the same privacy-first approach. Your audio file is decoded and analyzed locally on your device, so it does not need to be uploaded to our server just to estimate tempo or musical key.
TagMyBeat uses a WebAssembly-based audio analysis engine in the browser. WebAssembly lets us run lower-level audio processing code at near-native speed inside modern browsers, which is useful for heavier tasks like reading audio buffers, estimating tempo, detecting musical key, and converting the result into Camelot notation for harmonic mixing.
The analysis starts with browser audio decoding: after you choose a file, the browser decodes formats such as MP3, WAV, FLAC, M4A, AAC, or OGG when supported by your device and browser. The decoded audio is then passed into the local WASM analysis engine without sending the file to a backend.
Detected tempos are normalized into a practical range, so half-time or double-time results are easier to compare in DAWs and DJ software. The detected musical key is mapped to major/minor notation and Camelot code for DJ transitions, remix planning, and acapella matching.
Batch results are kept in a local table that you can copy as TSV or export as CSV. Because the analysis runs in the browser with WebAssembly, performance depends on your device: modern desktops, laptops, and recent phones usually work well, while older phones, low-memory devices, outdated browsers, or very large files may analyze slowly or fail to decode.