Case Converter
One box, four conversions: switch any text to UPPERCASE, lowercase, Title Case or Sentence case and copy the result. Title Case understands small linking words and protects short acronyms like NASA, while Sentence case re-capitalizes the start of every sentence — all computed locally as you type.
- UPPERCASE, lowercase, Title Case, Sentence case
- Small linking words handled
- Acronym protection in Title Case
- Live preview
Overview
Everything runs in your browser — your text is never uploaded.
How to use this tool
- 1Paste or type the text you want to recase.
- 2Pick UPPERCASE, lowercase, Title Case or Sentence case.
- 3Copy the converted text.
Examples
Title Case
the art of war in the modern age
Result
The Art of War in the Modern Age
Sentence case
NASA CONFIRMS THE MISSION SUCCEEDED.
Result
Nasa confirms the mission succeeded.
Limitations
- Title Case heuristics (small-word lists, acronym length) differ between style guides — review before publishing.
- Sentence case lowercases acronyms, since their original casing cannot be recovered.
Frequently Asked Questions
What is Title Case?
Capitalizing the first and last words plus the important words, while small linking words (and, of, the…) stay lowercase in the middle.
Are acronyms safe?
In Title Case, short ALL-CAPS words like NASA or HTML are left untouched. Sentence case, by design, lowercases everything first.
Is my text uploaded?
No — conversion happens in your browser, character by character, with no network involved.