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Little Pocket Apps
Musician Suite
Professional Tools — Free

Transpose Calculator

The singer wants it in a different key? Paste the chords, pick how far to move, and get the whole song transposed in one go.

Your Chords
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Transposed Chords

Moved

Slash chords move too. Both the chord and the bass note under the slash get transposed, so C/G becomes D/A when you move up two semitones. Anything that is not a chord, like a bar line or a word, is left alone.