Key Transposer
Paste a chord progression or song, choose how many semitones to shift, and get the transposed chords instantly.
100% client-side · no upload
Transposed chords
How to use
- Type or paste your chord progression into the text area (e.g. C Am F G).
- Use the +/− buttons or the semitone presets to shift the key.
- The transposed chords appear instantly in the output box.
Related music tools
- Chord Finder — see the notes in any chord
- Scale Builder — build scales in the new key
- Interval Trainer — understand semitone distances
Frequently Asked Questions
- Is this key transposer free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All transposition happens in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The key transposer is mobile-first and works on iPhone Safari and Android Chrome.