Key & BPM Finder
Instantly detect the musical key and tempo (BPM) of any song — including key changes throughout the track.
Click to upload or drag and drop
MP3, WAV, FLAC, OGG, AAC, M4A (max 50MB)
Must be a direct link to an audio file (MP3, WAV, FLAC, etc.). YouTube and streaming links are not supported.
What Is a Key & BPM Finder?
A key & BPM finder analyses an audio file and tells you two things every DJ, producer, and musician needs: the musical key the song is in, and its tempo in beats per minute. Upload a track or paste a direct link, and in under a minute you get the dominant key, the BPM, and — unusually — a timeline of key changes throughout the track.
Knowing the key and tempo is the foundation of harmonic mixing, remixing, sampling in tune, playing along, and building setlists that flow.
How It Works
- Upload your song (MP3, WAV, FLAC, OGG, AAC, M4A — up to 50MB) or paste a direct audio URL.
- The AI analyses the audio — usually 30–60 seconds.
- Read the results: dominant key, BPM, and key changes with timestamps.
Who Uses It
- DJs — match keys and tempos for smooth, harmonic transitions.
- Producers — sample and remix in tune, and set the session tempo right the first time.
- Musicians — find the key before learning or covering a song.
- Singers — check whether a track sits in your comfortable range before committing.
Why Key Changes Matter
Many songs don't stay in one key — a final-chorus lift is a classic move. Most key finders only report a single key, which can throw off a mix or a sample. This tool maps the key changes across the timeline, so you know exactly what's happening at every point in the track.
Key & BPM Finder — Frequently Asked Questions
How accurate is the detection?
Very accurate for most produced music. Extremely dense or heavily detuned material can be harder — the key-change timeline helps you sanity-check the result.
What formats can I upload?
MP3, WAV, FLAC, OGG, AAC, and M4A, up to 50MB — or paste a direct link to an audio file.
How long does the analysis take?
Usually 30–60 seconds. Previous analyses stay available in your dashboard.
Does it detect key changes?
Yes — that's the standout feature. You get a timeline of the keys across the track, not just one overall key.
Can I use YouTube or Spotify links?
No — streaming links aren't supported. Upload the audio file or use a direct link to one.
Is it free?
You can create a free account and try it. Analyses use affordable credits that scale with usage.