Swap Case
Flip every letter's case in one pass — handy when a heading was typed in the wrong case, or when you need awkward mixed-case input to test a form. Punctuation, digits, and non-Latin text pass through untouched.
How to use
- Paste the text into the box — mixed languages are fine.
- Lowercase letters become uppercase and vice versa; everything else is untouched.
- Press Copy result to replace the original, or run it again to flip back.
FAQ
Can it capitalise just the first letter of each word?
No. This flips every character: lowercase becomes uppercase and uppercase becomes lowercase, so Hello World turns into hELLO wORLD. For title case, use the title-case option in a case converter instead.
Do Chinese characters and digits change?
No. Characters without a case are emitted unchanged, so in mixed text only the Latin letters flip — digits, punctuation, and Chinese characters stay exactly as they were.
Further reading