FindBPM — Free BPM and Key Finder

FindBPM is a free browser-based tool for estimating the tempo and musical key of an audio file. It accepts MP3, WAV, FLAC and M4A files up to 100 MB and processes the audio on your device instead of uploading it. DJs and producers can use a BPM finder to check the exact version of a track or loop they plan to work with, then compare the estimated key and Camelot code while preparing a set. If the tempo feels twice or half as fast as the displayed number, use the 2× or ÷2 controls and listen again. The energy and danceability scores are estimates, so confirm musical decisions by ear. FindBPM works without an account, subscription or credits.