Read the estimate and its range
Choose one MP3 or WAV. Check the tempo, key, and analyzed range before using the result. A whole-track summary is a starting point; it may miss changes between sampled sections.
KNOW YOUR SOUND
Song Key & BPM Finder
Find the tempo and musical key of your audio. Choose a track, read the estimates, and take your next idea into the studio.
Add your audio
or drop one file here
MP3 or WAV · Up to 25 MiB · 1 second–10 minutes · Auto analysis from 8s
Your audio stays on your device. Analysis runs in your browser.
Estimated results
Tempo—BPM
Musical key—
Your tempo and key will appear here.
Estimates are a starting point. Check by ear, especially for live music, changing keys, or complex mixes.
Try an original demo
Choose a demo track to try tempo and key analysis.
FROM LISTENING TO MAKING
A clearer starting point for your next track.
Listen, select, and check
Open Check & adjust. Play a steady section with the reference beat, align it to a clear beat, and listen for drift. Try ½ or 2×, tap along, or enter a known BPM. Use Analyze this section for an 8–90 second selection.
Adopt values, then export
After checking, select Use these values. Your adopted values are separate from the automatic estimate. Copy or download the report, which identifies the analysis range and adopted values. Unsaved edits are not exported.
A CLOSER LOOK
From an estimate to values you can use
A walkthrough with the built-in House demo. These screenshots explain the controls; they are not an accuracy test on independent recordings.
Read the automatic estimate
Read the analyzed range and any alternative tempo or key. Treat the automatic result as a starting point.
Listen, check, then adopt
Listen, adjust, then select Use these values. A manually chosen key records your decision; it does not validate the key.
What the finder actually analyzes
- Local audio, two different estimates
- Your chosen file is decoded and analyzed in your browser. Repeating changes in sound energy inform tempo; the distribution of pitches informs key. Either estimate can be unknown or ambiguous.
- A summary or a chosen section
- For recordings from 8 to 90 seconds, the summary analyzes the whole clip. Longer recordings use three 30-second windows: beginning, middle, and end. Analyze this section instead examines your selected 8–90 seconds.
- Short loops need a different check
- Clips from 1 second to under 8 seconds support listening, Tap, and manual values, but not automatic analysis. Changing the listening range does not update the estimate: analyze the new section before using its result.
When the estimate needs another check
- The pulse feels half or twice as fast
- Compare ½ and 2× with the musical pulse. Align the reference beat and listen near both the start and end of a steady section. A plausible number alone does not prove the beats stay aligned.
- The tempo or key changes
- Choose a shorter, stable passage and analyze it again. Repeat for other passages. One summary cannot describe a changing tempo or every key in a song; this tool does not create a dynamic beatgrid.
- The key is unclear or unexpected
- Try a section with clear pitched instruments. Pure drums, speech, dense mixes, and relative major/minor keys can be ambiguous. Use a known key from your project if available, or leave it unknown instead of guessing.
Guide checked against the current tool on September 18, 2026. Maintained by AIGenMusic.
A few things worth hearing.
What is the difference between BPM and song key?
BPM means beats per minute: it describes how fast the musical pulse repeats. A song’s key describes its tonal center, such as C major or A minor. Two songs can have the same tempo and different keys, or the same key at different tempos.
How accurate is this key and BPM finder?
Both results are estimates. A steady beat and clear tonal instruments give the analyzer more useful information. Live timing, tempo changes, pitch shifts, key changes, and dense mixes can make the result ambiguous. A 70 BPM track may also feel like 140 BPM. Use the alternatives and your ears before arranging or mixing.
Does my audio get uploaded, stored, or used for training?
The analyzer reads your selected file locally in your browser. It does not upload the audio to our servers or send it to an AI service. Clear the tool or close the page to release the file from the tool. Example buttons download our demo audio so it can be analyzed locally.
Which files and track lengths can I analyze?
Choose one mono or stereo MP3 or WAV, up to 25 MiB and between 1 second and 10 minutes. Automatic analysis needs at least 8 seconds; shorter clips support listening, Tap, and manual values. The analysis section above explains which parts of longer recordings are sampled.
Key and BPM describe a song’s harmony and tempo. To explore whether a recording may be AI-generated, use the AI music checker. Treat its estimate as a clue alongside the recording’s source and production history.