Case Converter
Change text to UPPER, lower, Title, Sentence, camelCase, snake_case and more.
How to use Case Converter
- Paste your text.
- Choose the case you need. The result updates instantly.
- Copy the result or download it as a text file.
How it works
Title Case capitalizes every word except short articles, conjunctions and prepositions (a, an, and, of, the, to, in, on…) unless they are the first or last word of the line, similar to the major style guides. Sentence case lowercases everything and capitalizes the first letter of each sentence; proper nouns must be fixed by hand because no tool can know them reliably.
The programming cases (camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case) split text into words at spaces, punctuation and existing case changes, so "getHTTPResponse code" becomes get_http_response_code in snake_case.
Frequently asked questions
Which title case style does this follow?
A common rule shared by AP and Chicago for short words: articles, coordinating conjunctions and short prepositions stay lowercase unless first or last. Style guides differ on details such as prepositions of four or more letters; check your guide for edge cases.
Will sentence case keep names capitalized?
No. Sentence case lowercases everything first, so names like "New York" become "new york". Fix proper nouns after converting.
Does it work with accented and non-Latin letters?
Yes. Conversion uses the browser’s Unicode case rules, so é→É and ß→SS work. Scripts without case (such as Chinese) are left unchanged.
Is there a limit on text length?
No fixed limit; very large texts depend on your device’s memory.
Limitations
- Title and sentence case cannot recognize proper nouns or acronyms; review the result.
- Programming cases remove punctuation and emoji because identifiers cannot contain them.
Last reviewed November 9, 2026. How we build and test tools.