Free BPM finder

Choose an audio file to estimate its tempo and musical key in one pass.

Drop a track. Find its pulse.

MP3, WAV, M4A, FLAC or OGG · up to 50 MB / 10 minutes

Ready when you are

A starting point for your next mix.

Knowing a track’s BPM helps you line up a practice click, plan an edit or compare songs for a mix. Automatic detection works best with a clear, steady beat. Live recordings, ambient music and tempo changes deserve a second listen.

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A starting point for your next mix.
Producer wearing headphones at a bright desk with a computer and studio speakers

Turn a song into a useful practice starting point

Choose an MP3 or WAV to estimate its tempo locally, without uploading the audio. This free BPM finder stays on your device. Use the reading as a reference when setting the metronome for a guitar part, a piano passage, or a dance rehearsal. You can begin below the estimated speed and build up gradually.

Use the BPM finder
DJ with headphones around the neck beside digital decks and a mixer in daylight

Compare tempo and key before planning a mix

A single analysis from this BPM and key finder helps you compare tracks for a DJ mix or a practice playlist. Check the confidence, then listen to the song alongside a metronome to test half-time or double-time alternatives. For the harmonic side of the same file, open the free key finder.

Use the BPM finder

Three steps. Straight to the music.

  1. Choose your audio

    Select or drop a file your browser can decode. MP3 and WAV are good starting points. Maximum file size is 50 MB and length is 10 minutes.

  2. Let your browser analyze it

    Audio is decoded locally. Longer tracks use a representative section of up to two minutes to keep analysis practical.

  3. Read tempo and key together

    See an estimated BPM alongside musical key and confidence. Check half-time or double-time alternatives against the actual groove.

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Keep going with the same session

A tempo or a pitch is rarely the only question. Stay on Viralkey to finish the next part of the same practice.

Explore Tools

Start from harmony and instruments

Hear a key, play a shape, or try a voicing in the browser before you take it back to your track.

Free interactive music tools

What creators say about Viralkey

Explore how creators turn photos and music into music videos with Viralkey.

JM

Jason Mitchell

Indie Musician

One portrait plus my track — a performance-ready AI MV in 3 minutes.

Short-form for the next release finally keeps up.

GF

Grace Fox

Label Manager

Same face, different style — the team gets a new visual direction without reshooting or rebuilding the concept.

EW

Emma White

Electronic Musician

Upload a song and AI builds around rhythm and emotion — drops and energy shifts land in the picture.

MC

Mia Chen

Producer

No shoot crew.

Upload the track and get a release-ready AI music video in minutes.

DM

Diego Martins

Musician

Lip-sync and expression actually feel like singing — not a mismatched face track.

Viewers feel the emotion land.

HP

Hannah Parker

Label Manager

Same face across performance, story, and VFX, then 100+ styles on top — series posting finally scales.

RN

Ravi Nair

YouTuber

TikTok needs hooks and watch-through structure.

Viralkey clips can stop the scroll in the first seconds.

YL

Yuki Lin

Creator

Scenes and looks change, but the face stays the same — no face drift, consistent character at last.

LS

Leo Santos

Creator

Ship on release day: image to music video or song to music video — both modes cover what I need.

A few things worth knowing

Choose the audio file here to estimate its tempo, or use the BPM Tapper if you only want to tap along. The analyzer works on a local file, not a streaming-service link.

Free BPM finder

Choose an audio file to estimate its tempo and musical key in one pass.

Use