Toggle Case Converter (Inverse Case)

Flip every letter’s case in place: Hello World becomes hELLO wORLD. Non-letters stay put; nothing is uploaded.

Each alphabetic character is toggled with locale-aware upper/lower mapping. Digits, spaces, and symbols are unchanged. Use Alternating Case when you want a fresh aLtErNaTiNg pattern instead of flipping what is already there.

Dernière révision 2026-09-28.

FAQ

Questions, réponses

What is inverse case?

Inverse case (also called toggle case) swaps uppercase letters for lowercase and vice versa, preserving the shape of the original paste.

How is inverse different from alternating?

Inverse flips existing case letter by letter. Alternating rebuilds a strict upper-lower rhythm regardless of the input’s current caps.

Are accents and emoji kept?

Yes. Accented letters toggle case when the alphabet allows it. Emoji, digits, and punctuation are left alone.

Can I undo inverse case?

Run Inverse Case again on the result — a second pass restores the original letter cases. Or use Undo in the toolbar.

Does my text leave the browser?

No. The inverse case converter runs in JavaScript on this page. Your paste is not uploaded.

Toggle Case / Inverse Case Converter (flip UPPER ↔ lower)

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