Audio Key Finder

Find a song's musical key and scale privately in your browser.

Analysis stays on your device

Your result will appear here

Why use this audio key finder?

Get a practical key and scale estimate with a fast, private browser-based workflow.

A clear musical key estimate

See the most likely tonic and whether the track leans major or minor. That gives you a useful starting point for harmonic mixing, choosing compatible samples, transposing an idea, or checking a song by ear.

Audio stays on your device

The audio key finder analyzes audio locally in your browser. Your file is decoded and inspected on your device, never uploaded to Melodusk and never sent to an AI provider.

Confidence you can read

Every analysis comes with a confidence value, so you know how strong the signal is. A confident result is a fast answer; a lower one tells you to trust your ears and check a second track or section.

A focused one-file workflow

Choose a common audio file, run one analysis, and read the key, scale, and confidence together. There is no account gate, credit cost, or production setup between the file and the answer.

Key and scale

Find the likely tonal center

Confidence

Read how strong the signal is

Local processing

Keep audio on your device

How to use the audio key finder

No upload queue, account, or credits—just choose, analyze, and use the result.

Choose a track

Drop in a browser-supported audio file up to 100 MB.

Analyze locally

The tool reads tonal features on your device, with no upload.

Use the result

Take the estimated key and scale into your mix, edit, or practice session.

Useful anywhere tracks need to fit together

Bring better context into DJ sets, production sessions, practice, and arrangement.

DJs and selectors

"I want to plan smoother transitions between tracks."

DJs can compare tonal center before arranging a set. The result gives you a quick reference for harmonic mixing, while your ears remain the final check for tracks with ambiguous tonality or key changes.

Music producers

"I need a session key before I start editing."

Producers can inspect a reference, sample, or demo before choosing compatible material, setting a transposition, or testing a new arrangement. It is a fast way to move from an unknown file to an informed starting point.

Musicians and learners

"I am learning a song and want a useful first clue."

Musicians can use the detected key and scale to narrow down what they hear, pick a comfortable transposition, or choose a scale to practice. The estimate supports ear training rather than replacing it.

Audio key finder questions

What to know before analyzing your first track.

Yes. It does not use credits, require a subscription, or ask you to sign in. The analysis runs locally in your browser.

No. Your browser decodes and analyzes the selected file on your device. The audio is not uploaded to Melodusk or sent to an external AI provider.

The file picker accepts MP3, WAV, FLAC, M4A, OGG, and AAC files up to 100 MB. Actual decoding support depends on your browser and operating system.

They are estimates. Tracks with clear harmony and a strong tonal center usually provide a stronger signal. Live key changes, heavy effects, dense percussion, or ambiguous harmony can reduce confidence.

Some songs center on a relative major/minor pair or shift keys across sections. The tool reports the strongest single reading; treat it as a starting point and let your ears decide the final answer.

It can run in modern mobile browsers, but long or large files require more memory and may analyze more slowly than on a desktop computer.

Try the free online audio key finder

Find its likely key and scale without uploading the audio.