Case Converter

Text Case Types Explained

Different text cases serve different purposes in writing and programming. Here is a reference of all supported case types:

Case	Example	When to Use
UPPERCASE	HELLO WORLD	Headings, acronyms, emphasis, constants
lowercase	hello world	URLs, email addresses, casual text
Title Case	Hello World	Book titles, article headings, proper nouns
Sentence case	Hello world	Body text, UI labels, natural prose
camelCase	helloWorld	JavaScript/Java variables and functions
PascalCase	HelloWorld	Class names, C# methods, Go types
snake_case	hello_world	Python variables, Ruby, database columns
kebab-case	hello-world	CSS classes, URL slugs, CLI flags
CONSTANT_CASE	HELLO_WORLD	Environment variables, constants in code
dot.case	hello.world	Java packages, configuration keys
aLtErNaTiNg	hElLo WoRlD	Sarcasm text, memes, stylistic emphasis
iNVERSE	hELLO wORLD	Swap existing case of each character

Case Conventions in Programming

Programming languages and ecosystems each have their own naming conventions:

• camelCase is the standard for variables and function names in JavaScript, Java, and TypeScript. Example: getUserName, isActive
• snake_case is the convention in Python (PEP 8), Ruby, Rust, and is also common for database column names and API query parameters. Example: get_user_name, is_active
• PascalCase is used for class names in most languages, as well as for types and interfaces in C#, Go exported identifiers, and React component names. Example: UserProfile, HttpClient
• CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) is used for environment variables, compile-time constants, and enum values. Example: MAX_RETRIES, API_BASE_URL
• kebab-case is the convention for CSS class names, HTML attributes, URL slugs, and CLI flag names. Example: main-content, --output-dir

How to Convert Case in Code

Quick reference for common case conversions in popular languages:

• JavaScript: str.toUpperCase(), str.toLowerCase(). No built-in Title Case; use str.replace(/\b\w/g, c => c.toUpperCase())
• Python: str.upper(), str.lower(), str.title(), str.capitalize()
• C#: str.ToUpper(), str.ToLower(), CultureInfo.CurrentCulture.TextInfo.ToTitleCase(str)
• Go: strings.ToUpper(s), strings.ToLower(s), strings.Title(s) (deprecated; use cases.Title)

For camelCase, snake_case, and other developer-oriented conversions, most languages require a library or a custom function that splits words on boundaries and re-joins them with the appropriate separator and capitalization.

Frequently Asked Questions

What is Title Case?

Title Case capitalizes the first letter of each word, except for short articles, prepositions, and conjunctions like "a", "an", "the", "in", "on", "at", "to", "for", "of", "and", "but", and "or" -- unless they are the first or last word. It is the standard style for book titles, article headlines, and headings in most style guides.

What is the difference between camelCase and PascalCase?

Both join words without separators. camelCase starts with a lowercase letter (myFunction), while PascalCase starts with an uppercase letter (MyFunction). Use camelCase for variables and functions in JavaScript/Java, and PascalCase for class names and React components.

How do I convert snake_case to camelCase?

Paste your snake_case text into the input area and click the camelCase button. The tool splits your text on underscores, lowercases the first word, capitalizes the first letter of each remaining word, and joins them. For example, my_variable_name becomes myVariableName.

Is my text sent to a server?

No. All conversion happens locally in your browser using JavaScript. Your text never leaves your device. There is no server-side processing, no upload, and no storage.