Audio → key & tempo → ideas
Song Key & BPM Finder
Choose a recording, estimate its key and tempo, then explore the scale. Review the alternatives or make your own corrections.
01 / Choose your recordings
Find the key and tempo of your audio
Drop MP3 or WAV files here
Up to 3 files per batch · 100 MB and 20 minutes per file · At least 5 seconds
Analysis runs on your device. Files are not uploaded.
02 / Review & explore
Your audio results
Key and tempo are estimates. Compare alternatives, or correct them before exporting.
No recordings selected yet
Choose an MP3 or WAV file above. Each recording is processed separately.
How to find a song’s key and BPM
- Choose MP3 or WAV audio. Drop up to three files or use the file picker. Each recording must be 5 seconds to 20 minutes and no larger than 100 MB.
- Analyze on your device. Files are handled one at a time. You can cancel the batch; a browser operation already in progress may need a moment to finish.
- Review the estimates. Compare possible keys and half/double tempo. Correct the key or BPM when your musical context suggests a different interpretation.
- Explore or export. Open the chosen scale in the notes tool, copy the results or download a CSV. Manual corrections are labelled in the export.
What the results mean
Key analysis compares the pitch content with major and minor tonal profiles. A song can fit several keys, and relative major/minor pairs can be difficult to separate. The alternatives are possibilities, not accuracy percentages.
BPM describes a pulse, but a listener may count that pulse at half or double tempo. Rubato, changing tempo, sparse percussion and ambient recordings can produce an unreliable estimate. Tempo is checked on a section of the recording; changes elsewhere may be missed.
Camelot is a key notation used for harmonic mixing. It is calculated from the selected major or minor key. Changing the key selection updates the Camelot code and the scale link.
Limits and privacy
Use a clear recording containing several musical phrases. Silence and very short or corrupt files do not provide enough information. Percussion can have a tempo without a tonal key. A modulating song may need different keys for different sections.
MP3 and WAV decoding depends on your browser and the codec inside the file. Unsupported or corrupt recordings show an error rather than a made-up result. Other formats are not enabled.
Audio and filenames stay in this tab’s memory while you use the tool. The app has no audio upload endpoint. Files and results are not saved to browser storage. Resetting the batch clears them from the tool. Only the scale’s notes and settings are included when you open the notes tool.
For related questions, visit the separate FAQ page or read the privacy details. Already know the notes? Use the Scale Finder.