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Inverse case converter

Flip the case of every letter: uppercase becomes lowercase and lowercase becomes uppercase, instantly.

Inverse Case

Paste text below and every letter swaps case.

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How inverse case works

Inverse case maps each letter to its opposite: Hello World becomes hELLO wORLD. Digits, spaces, and punctuation are untouched. Applying it twice returns the original text exactly.

Fixes caps-lock accidents

The most practical use is rescuing text typed with caps lock on: hELLO becomes Hello in one click, saving you from retyping a whole paragraph.

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Inverse Case FAQs

What does inverse case do exactly?
Every uppercase letter becomes lowercase and every lowercase letter becomes uppercase. Non-letters are copied unchanged.
Can it fix text typed with caps lock on?
Yes, that is its best use. Paste the ALL-CAPS-accident text and it flips to normal mixed case, though sentence capitalization still needs a quick check.
What happens if I run it twice?
You get the original text back. Inverting the case is its own inverse, so the operation is perfectly reversible.
Does it change numbers or punctuation?
No. Only A to Z and a to z are swapped; digits, spaces, emoji, and punctuation pass through untouched.
Is my text sent to a server?
No. The conversion runs entirely in your browser with JavaScript. Nothing you paste ever leaves your device.
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