Free tool · no signup
Practice Tools
Drop in an mp3 to slow it down without changing pitch, set a loop on the tricky part, transpose for any instrument. Everything runs in your browser — we never see your audio.
With Pro
Want chord charts and lyrics for this song?
Chords.fm transcribes the chord progression and time-aligned lyrics from the same audio. Free tier available.
Keyboard shortcuts
- Space — play / pause
- ← → — skip ±5 seconds
How accurate is it?
Tempo and pitch processing use SoundTouchJS; key + BPM detection runs through Essentia. Both are good on clean recordings and most pop / rock tracks; tempo detection can occasionally land on a half- or double-time multiple, and key may show a relative major / minor on ambiguous material. The slow-down + loop combination is what most musicians actually use this for — those are rock-solid.