This free BPM detector finds the tempo and musical key of any track — MP3, WAV, FLAC, OGG or AAC — in a few seconds, with no login, no email and no upload. The analysis runs entirely in your browser, so your unreleased masters and demos never leave your computer. It's built for producers, DJs and independent label teams who need an accurate BPM and key reading while tagging catalogue, planning a mix or prepping release metadata.