Sentence Case Converter
Convert text to sentence case instantly in your browser.
Tool workspace
Conversion runs in your browser. Nothing you paste is sent to our servers.
How it works
Paste or type text into the input. The tool lowercases the whole string, then capitalizes the first letter and any letter that follows a sentence terminator (`.`, `!`, or `?`), including optional closing quotes or brackets and whitespace.
Example: HELLO. HOW ARE YOU? → Hello. How are you?
Results update as you type (light debounce) or when you press Convert. Empty input produces an empty result—no error.
Note: abbreviations and edge cases like i.e. are best-effort heuristics, not full NLP. Whitespace and non-letter characters are preserved aside from the case changes above.
Locale note: case mapping follows the JavaScript String.toLowerCase() / toUpperCase() (and UTF-8 mb_* mirrors in Domain tests).
Example: HELLO. HOW ARE YOU? → Hello. How are you?
Results update as you type (light debounce) or when you press Convert. Empty input produces an empty result—no error.
Note: abbreviations and edge cases like i.e. are best-effort heuristics, not full NLP. Whitespace and non-letter characters are preserved aside from the case changes above.
Locale note: case mapping follows the JavaScript String.toLowerCase() / toUpperCase() (and UTF-8 mb_* mirrors in Domain tests).
Examples
- HELLO. HOW ARE YOU? → Hello. How are you?
- this is a test. another sentence! → This is a test. Another sentence!
- CAFÉ. ÉCLAIR → Café. Éclair
Privacy
Privacy: this tool processes text locally in your browser. We do not log or store what you paste. Login is not required.
FAQ
Is my text uploaded to a server?
No. Sentence case conversion runs entirely in your browser. Pasted content is not sent to Nova Engine.
Do I need an account?
No. All published tools work for guests without login.
Does it keep proper nouns or abbreviations?
No. The tool lowercases everything first, then capitalizes sentence starts. Abbreviations like i.e. are best-effort, not linguistic analysis.