Key & BPM Finder
Choose a song to see its key and beats per minute. Check the key before a cover, then decide whether to transpose.
- No uploads
- Log in to use
- No usage limits
- ¥0
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§ 01How-to
How do I find a song's key and BPM online?
Three steps to learn a song's key and tempo. The file is analyzed only in your browser and never uploaded.
- Check the original key before a cover
- Find a key that's comfortable to sing
- Get the BPM to practice with a metronome
- Pick songs with the right tempo for dance or workouts
Choose a song
Click the box above or drag in an audio or video file. MP3, WAV, FLAC, M4A and common video formats all work, up to 20 minutes.
Start analysis
Leave the tempo range on “Normal” and tap “Start analysis” — results usually come in a few seconds.
Read the result, tap to check
See the key, relative key, BPM and alternatives. If you're unsure about the tempo, tap along while listening to check.
§ 02FAQ
Q1How accurate is it?
It's estimated automatically from the audio. Pop songs with a clear beat and key are usually detected correctly, but treat it as a guide. Relative major/minor keys (like C major and A minor) share the same notes, and major/minor on the same root (like E major and E minor) sound alike, so they're easy to mix up; for songs that change key or tempo midway, only the main result is given. That's why several alternatives are listed — tap one to switch to it.
Q2Why is the BPM half or double the real tempo?
Beats can be counted twice as fast or half as fast — this happens a lot when measuring tempo: fast songs often come out at half, slow songs at double. The result lists half-time and double-time as alternatives; you can also check with “Tap along”, or switch the tempo range to “Slow songs” or “Fast songs” and analyze again.
Q3Once I know the key, how do I change it to suit me?
Sing the high part of the chorus in the original key: if it's a strain, go down 1–2 semitones; if the low notes won't reach, go up 1–2. Once you've settled on the number, use the pitch shifter on this site to shift the whole backing track, tempo unchanged.
Q4What do major, minor and relative key mean?
Major keys usually sound brighter; minor keys usually sound darker and more emotional. Every major key has a relative minor that uses the same notes, with its root 3 semitones lower — e.g. C major and A minor, G major and E minor.
Q5Are files uploaded? Do I need to log in?
Nothing is uploaded. Log in to use it free with no usage limits; analysis happens entirely in your browser.
§ 03Other tools
Pitch & TempoChange key or speed independentlyVideo to AudioPull the audio out of MP4/MOVAudio Format ConverterMP3, WAV, FLAC and M4AAudio CutterTrim a chorus or any sectionAudio JoinerJoin clips into one file, in orderBacking-track separationPaid25s preview first · ¥4.9/song · First song ¥1 after sign-up