Song Key Finder

Drop an audio recording or a video with sound to estimate its musical key and BPM. Results are estimates, not verified scores or promises of accuracy.

Drop one audio file here, or choose a file

MP3, WAV, M4A, FLAC, OGG, or a MOV video with an audio track when your browser can decode it. Video pictures are ignored. One file, up to 100 MB or 10 minutes. Processing stays in this browser; the file is not uploaded.

Choose an audio file.

Estimates can be ambiguous for short, atonal, noisy or rhythm-free recordings. BPM can appear at half or double the felt tempo. Check against the original audio before relying on a result.

To convert an MP3 recording into estimated MIDI notes, use mp3 to midi.

find a song key

Choose a supported audio file above and run the analysis. The tool shows a most likely key estimate and a second estimate; listen and check the result before relying on it.

find key and bpm

Choose a file and select Find key and BPM. The result includes key estimates and a BPM estimate; another half-time or double-time reading is shown alongside it.

key and tempo finder

Tempo is displayed as an estimated BPM. If more than one pulse fits, compare both readings with the audio.

autotune key finder

A key estimate can be a starting point when setting a pitch-correction tool. Check the key by ear; this page does not apply pitch correction or change your audio.