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The UseCOS Case Converter transforms text strings between standard editorial formats (Sentence case, Title Case, lowercase, UPPERCASE) and software developer naming conventions (camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE) 100% in-browser with live statistics.
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case.
Choosing the right capitalization format is essential for clear writing, copywriting, URL structures, and clean source code. Here is how each case behaves:
| Case Format | Example Output | Primary Use Cases |
|---|---|---|
| Sentence case | The quick brown fox jumps. | Standard paragraph writing, emails, UI button labels |
| Title Case | The Quick Brown Fox Jumps | Blog headlines, book titles, article headings |
| camelCase | theQuickBrownFox | JavaScript, TypeScript, Java, and C# variable & method names |
| PascalCase | TheQuickBrownFox | Class names, React components, TypeScript types and interfaces |
| snake_case | the_quick_brown_fox | Python variables, SQL column names, database identifiers |
| kebab-case | the-quick-brown-fox | URL slugs, CSS class selectors, CLI flags, package names |
| CONSTANT_CASE | THE_QUICK_BROWN_FOX | Environment variables, global constants, enums |
Selecting the exact idiomatic naming standard required by popular compilers, linters, and frameworks:
| Programming Ecosystem | Variables & Functions | Classes & Types | Constants & Config | File / Directory Names |
|---|---|---|---|---|
| JavaScript / TypeScript / React | camelCase | PascalCase | CONSTANT_CASE | kebab-case or PascalCase (Components) |
| Python (PEP 8) | snake_case | PascalCase | CONSTANT_CASE | snake_case.py |
| Rust | snake_case | PascalCase | SCREAMING_SNAKE | snake_case.rs |
| Go (Golang) | camelCase / PascalCase (Exported) | PascalCase | camelCase / PascalCase | snake_case.go |
| Web & SEO Infrastructure | camelCase (JSON keys) | Sentence case (H1/H2) | UPPERCASE (HTTP Headers) | kebab-case (URL slugs & CSS classes) |
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