Case Converter
Convert text between different letter cases instantly.
Multiple Formats
Convert to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, and snake_case instantly.
Preserve Special Characters
Numbers, punctuation, and special symbols remain unchanged—only letter casing is transformed.
Multi-line Support
Process entire paragraphs, lists, or code blocks. All lines are converted while preserving line breaks.
One-Click Copy
Copy converted text to clipboard with one click. Perfect for quick text formatting tasks.
Text Case Transformation Guide
Text case conversion is essential in programming, content editing, and data formatting. Different contexts require different casing styles: titles need Title Case, constants use UPPERCASE, URLs prefer lowercase, variables in code follow camelCase or snake_case conventions. Proper casing improves readability, maintains code standards, and ensures SEO-friendly URLs.
Common Case Formats
UPPERCASE is used for constants, emphasis, or acronyms. lowercase is standard for URLs, email addresses, and hashtags. Title Case capitalizes major words for headlines and titles. Sentence case capitalizes only the first word and proper nouns. camelCase (firstName) is common in JavaScript and Java, while snake_case (first_name) is prevalent in Python, Ruby, and database naming. Each format serves specific conventions in programming, writing, or web standards.
When to Use Each Case
Use UPPERCASE for constants (MAX_VALUE), environment variables, or shouting (SALE!). Use lowercase for URLs, file names, email addresses, and CSS classes. Use Title Case for article headlines, book titles, and page headings. Use Sentence case for regular paragraphs and UI labels. Use camelCase for JavaScript variables and functions. Use snake_case for Python functions, database columns, and API endpoints. Following these conventions improves code readability and maintains industry standards.