Sentence Case Converter
Lowercase cased text, then capitalize sentence and line starts using deterministic punctuation rules. Abbreviations remain heuristic.
Conversion runs only in this browser. Input and output are not uploaded.
Input size: 0 B.
Sentence-case rule
Cased text is lowercased first. The first cased grapheme at the document or line start and after ., !, ?, γ, οΌ, or οΌ is then uppercased. Decimal points between digits are ignored as boundaries.
Abbreviations, initials, and language-specific punctuation remain heuristic; this is not natural-language parsing. Processing remains browser-local.
Using this tool
Sentence case
Lowercase cased text, then capitalize the starts of sentences and lines using deterministic punctuation rules.
Input and output
Example: `HELLO WORLD! HOW ARE YOU?` becomes `Hello world! How are you?`.
Important behaviour
The tool preserves the surrounding symbols and spacing while normalizing letter case.
Keep in mind
Abbreviations, names, and language-specific sentence boundaries are heuristic.
Conversion is performed in the browser. Copying or downloading happens only when you choose those actions.