Key Finder & BPM Finder
Free online song key detector and tempo finder. Upload a file or paste a track link — get the musical key, relative key, and BPM.
Online key finder and BPM analyzer
Producers search for a key finder or BPM finder when they need the musical key and tempo of a reference track before writing, sampling, or pitching vocals. Chainprint detects both from the audio itself — not a third-party database guess — so you can confirm key, relative key, and BPM against what you hear.
- Song key finder — major/minor key with confidence
- Relative key — same signature, alternate mode
- BPM / tempo finder — beats per minute with a reliability note
- Works with uploads or Spotify, Apple Music, YouTube, and SoundCloud links
Key finder FAQ
How do I find the key of a song?
Drop an MP3/WAV (or paste a streaming link), then read the Key and Relative results. File uploads are measured in your browser.
How do I find a song’s BPM?
Same flow — the BPM meter shows estimated tempo and whether the read looks reliable enough to trust without a double-check.
Is the key and BPM finder free?
Yes. This Key · BPM tool is free. For a full vocal mix chain, open Analyze.