Sentence Case Converter
Convert text to sentence case: the first letter of each sentence is capitalized.
Input
Convert to
Output
Private by design
This conversion runs entirely in your browser. Your text is not sent to a server.
Tip
Passwords, API keys, and some identifiers are case-sensitive. Convert them only when you intend to change the value.
How to convert with Sentence Case Converter
Paste or type your text in the input box.
Watch the output update instantly — nothing is uploaded.
Pick another case style to open that converter with the same text.
Copy the result, or use it as the next input.
When should you use it?
Writing
Soften headlines, notes, and chat so the copy reads as normal sentences.
Programming
Match identifier conventions in code, configs, and APIs.
URLs
Prepare hostnames, paths, slugs, and CSS class names.
Data
Normalize names, tags, and imported rows to a single case.
About sentence case conversion
Sentence case capitalizes the first letter of each sentence and lowercases the rest, using simple boundary heuristics (periods, question marks, exclamation points). It is the usual style for paragraphs, not for programming identifiers.
Worked example: “HELLO WORLD. this is TOOLORA.” becomes “Hello world. This is toolora.” Abbreviations and “iPhone” style names may be lowercased incorrectly — fix those by hand. Title Case is the sibling for headlines that capitalize each word.
Related: lowercase, Title Case (/tools/capitalize), Case Converter hub. Nothing is uploaded.
The URL is /tools/sentence-case. Newlines without a period may not start a new sentence. This is not a grammar engine. Use lowercase if you wanted every letter small, or Title Case if you wanted every word capitalized. Lists after a colon may stay lowercase — that is the heuristic, not a bug in English class. Close the tab to drop the draft.
Sentence Case Converter examples
Headline
Sentence
Identifier
Case style comparison
| Style | Example | Typical use |
|---|---|---|
| lowercase | hello world example | Soft copy, tags, and normalizing user input |
| UPPERCASE | HELLO WORLD EXAMPLE | Headings, acronyms, and short labels |
| Sentence case | Hello world example | Prose, captions, and readable paragraphs |
| Title Case | Hello World Example | Titles, headlines, and proper names |
| camelCase | helloWorldExample | JavaScript variables and object keys |
| PascalCase | HelloWorldExample | Types, classes, and React components |
| snake_case | hello_world_example | Python, APIs, and database columns |
| kebab-case | hello-world-example | URLs, CSS classes, and file names |
| CONSTANT_CASE | HELLO_WORLD_EXAMPLE | Env vars, constants, and enum names |
Sentence Case Converter FAQ
It capitalizes after simple boundaries: period, question mark, and exclamation point, then lowercases the rest. “HELLO WORLD. this is TOOLORA.” becomes “Hello world. This is toolora.” Abbreviations and names like iPhone may be lowercased incorrectly — fix those by hand.
No. Title Case capitalizes every word (the public URL is still /tools/capitalize). Sentence case is for paragraphs and captions, not programming identifiers.
No. Conversion is local. Convert to keeps input if you switch to lowercase or Title Case. Close the tab to drop the draft.
Often not. The heuristic looks for period, question, and exclamation. Lists after a colon may stay lowercase. This is not a grammar engine. Use lowercase if you wanted every letter small, or Title Case if you wanted every word capitalized. Close the tab to drop the draft. Nothing is uploaded.