Sentence Case Converter
Lowercase the whole input, then capitalize the first letter at the start and after recognized sentence punctuation plus whitespace.
How to use
- Enter mixed-case prose and run the conversion.
Capabilities and scope
It provides a mechanical sentence-case cleanup for .!? and Japanese sentence-ending marks.
How it works
The input is first lowercased, then letters matching (^|[.!?。！？]\s+)(\p{L}) are uppercased.
Example
hELLO. wORLD! becomes Hello. World!.
Useful for
- Normalize irregular capitalization in ordinary prose
Before you use it
- Proper nouns, acronyms, and sentence boundaries without the recognized punctuation pattern are not preserved intelligently.
Frequently asked questions
Will an acronym like NASA stay uppercase?
No. The initial lowercase pass can turn it into Nasa.