Free tool
Key & BPM Finder
Drop in any song, loop or sample. Bleep tells you the key, the tempo and the chords that fit.
How it works
The finder splits your audio into short slices and measures how much of each of the 12 notes is in every slice. It adds them up, then compares the result with what each of the 24 major and minor keys usually sounds like. The closest match is your key.
For the tempo, it listens for the moments where new sounds start, like kicks, snares and plucks, and looks for the gap between them that repeats the most. That gap is one beat, and 60 seconds divided by it is the BPM.
It works best on full songs and loops with chords. Very short sounds, songs that change key, and tracks without drums are harder, so check the “Could also be” suggestions too.
Free starter pack
2 plugins, free. Forever.
Toaster adds warm saturation and Key Finder shows the key, BPM and chords live in your DAW. Make a free account and they're yours.
Get them freeQuestions
How do I find the key of a song?
Drop the song (or a loop or sample) into the box above. The finder listens to which notes are played the most, compares them with all 24 major and minor keys, and shows the best match, its Camelot code, the notes in the scale and the chords that fit. You can also click the suggested keys under "Could also be" to compare.
How do I find the BPM of a song?
Drop the file in and the BPM shows up next to the key. It listens for where new sounds start, like drum hits, and finds the beat that repeats. If a track feels half-time or double-time, both numbers are shown. You can also tap along with our BPM tapper.
Why does it sometimes say the relative key?
Every major key shares all its notes with a minor key (C major and A minor, for example), so they're easy to mix up. If the result sounds wrong, try the relative key under "Could also be". Both work for writing melodies over the track.
What is the Camelot code?
Camelot codes like 8A or 5B are what DJs use to mix in key. Tracks with the same number, or a number one step away, usually sound good together. A means minor, B means major.
Are my files uploaded anywhere?
No. The analysis runs in your browser, on your computer. Your audio never leaves your device.
Can I find the key of a sample or an 808?
Yes. For short one-shots there's no tempo, but the "Strongest note" tells you which note the sample plays, so you can tune it to your track.
Is there a plugin version?
Yes, and it's free too. The Key Finder plugin sits in your DAW and shows the key, BPM and chords live while your music plays, and you can drag the chords out as MIDI.
More free tools
- BPM, Delay & Reverb CalculatorTap the tempo, then get delay times, LFO rates and reverb pre-delay and decay that fit it.Open it →
- More on the wayA loudness checker and a chord finder are next.