iNVERSE cASE Converter
Swap the case of every letter — uppercase becomes lowercase and vice versa. Browser-only.
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About iNVERSE cASE Converter
Inverse case (also called toggle case or swap case) flips the case of every letter individually: uppercase becomes lowercase and lowercase becomes uppercase. Non-letter characters pass through unchanged. The result depends on the input's existing case rather than a uniform pattern.
When to use it
- Quickly inverting a CAPS LOCK accident
- Producing a playful 'reversed' display string
- Demonstrating Unicode case-mapping behavior
How it works
Each character is checked against its uppercase and lowercase variants. If it matches its lowercase variant (and differs from uppercase), it's promoted to uppercase. If it matches uppercase (and differs from lowercase), it's demoted to lowercase. Characters without case (digits, punctuation, ideographs) are passed through unchanged.
Examples
Each letter's case is flipped
Hello, World!
hELLO, wORLD!
And reverses back to normal
tHIS IS REVERSED.
This is reversed.
Frequently asked questions
- Is the operation its own inverse?
- Yes. Running inverse case on the output gives you back the original. Apply it twice and you're where you started.
- Does it work on non-Latin scripts?
- Yes for scripts with case (Greek, Cyrillic, Armenian). Scripts without case (Arabic, Hebrew, CJK) pass through unchanged.