Free key finder

Discover an audio track’s likely musical key, Camelot notation and BPM in one local analysis. A useful first step for a mix, a cover or a new idea.

Drop a track. Find its pulse.

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

Ready when you are

Harmony starts with a good reference.

A key estimate can help you compare tracks, choose a starting chord or plan a harmonic mix. It describes a likely tonal center, not a transcription. Relative keys, modal music and changing keys can make more than one answer plausible.

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Harmony starts with a good reference.
DJ listening beside records and a mixer in a bright studio

Explore harmonic mixing with a musical reference

Choose a local audio file to see an estimated key alongside its Camelot notation and BPM. This free key finder can help you shortlist tracks to audition together, but matching labels are not a promise that two songs will blend. Check the confidence, listen through the transition, and confirm the tempo with the BPM finder if you want a second pass.

Use the key finder
Pianist playing alone at a piano in a bright room

Check the key by playing along

Take the suggested key to a piano or guitar and play along with a familiar section of the song. Listen for the note or chord that feels like home, especially when comparing a major key with its relative minor. When you are ready to put a cover on screen, keep the same key in a music video template.

Use the key finder

Three steps. Straight to the music.

  1. Drop in a track

    Choose a local audio file. There is no server upload or credit charge.

  2. Find the tonal center

    The analyzer compares pitch-class patterns with major and minor key profiles and estimates tempo in the same pass.

  3. Listen before you commit

    Read the suggested key, Camelot label and confidence. Try notes or chords against the song and use your ears to confirm.

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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

Yes. Key Finder and BPM Finder use the same analysis. This page emphasizes musical key, while the BPM Finder page puts tempo first. Both show the same kinds of results.

Free key finder

Discover an audio track’s likely musical key, Camelot notation and BPM in one local analysis. A useful first step for a mix, a cover or a new idea.

Use