Frequently Asked Questions
How does this BPM finder work?
Upload an audio file and Solmi's BPM finder analyzes it directly in your browser — it decodes the audio, isolates the kick/bass band where the beat lives, detects the peaks, and measures the time between them to calculate the tempo. Nothing is uploaded to a server; the detection runs entirely on your device.
Does it also find the key of the song?
Yes. Alongside the BPM, Solmi estimates the song's musical key (for example, A Minor or C Major) by analyzing the audio's pitch content with a chromagram and matching it against standard key profiles — all in your browser. Treat it as a strong estimate; very chromatic or key-changing tracks can be ambiguous.
What's the difference between a BPM finder, BPM counter, and tempo finder?
They're the same thing — all three find the tempo of a song in beats per minute (BPM). A 'BPM counter' sometimes refers to the tap-along kind where you tap a key to the beat; this tool detects the BPM automatically from the audio file instead, so you don't have to tap.
Why does the result show more than one BPM?
Tempo detection has inherent octave ambiguity — a song at 75 BPM and one at 150 BPM produce a very similar beat pattern. We show the most likely tempo first, plus half-time and double-time candidates, so you can pick the one that matches how the song feels.
What audio formats are supported?
MP3, WAV, M4A, AAC, OGG, and FLAC — any format your browser can decode. Larger or longer files take a little longer to analyze.
Is the BPM finder free?
Yes, completely free with no signup. Once you know your song's BPM, you can turn the track into a beat-synced music video with Solmi's AI music video generator — also free to start.