Case Converter
Typed with Caps Lock on by mistake? “Sentence case” fixes it instantly.
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Change letter case in one click
Paste text and pick a style; the result updates instantly and can be copied or saved as TXT.
- UPPERCASE / lowercase — every letter up or down.
- Title Case — capitalizes each word except short words such as a, an, the, and, of, in, to (unless they start the line or follow a colon or period).
- Sentence case — lowercase with the first letter of each sentence capitalized, and “i” fixed to “I”. Proper nouns need a manual touch.
- iNVERT cASE — swaps upper and lower case.
Developer formats
Each line becomes one identifier: userNameAndEmail (camelCase), UserNameAndEmail (PascalCase), user_name_and_email (snake_case), user-name-and-email (kebab-case) or USER_NAME_AND_EMAIL (CONSTANT_CASE). Existing camelCase words are split correctly, so you can convert between formats.
Frequently asked questions
Does Title Case follow AP or Chicago style?
It uses a common simplified rule (short articles, conjunctions and prepositions stay lowercase). Check your style guide for edge cases.
Does it work with accented letters?
UPPERCASE and lowercase work for all languages. The other modes focus on the letters A–Z.
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