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Free Case Converter - Convert Text to camelCase, snake_case, UPPERCASE & More

Convert text between all 9 case formats instantly: UPPERCASE, lowercase, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and Sentence case - with live preview and one-click copy.

What Is a Case Converter?

A case converter (also called a text case changer or string case transformer) is a tool that reformats text between different capitalization styles. Each case style has a specific purpose in programming, writing, and design. Developers need to convert between cases constantly - a variable named in camelCase in JavaScript needs to become snake_case in Python, or CONSTANT_CASE in a configuration file. Writers need to switch between Title Case for headlines and Sentence case for body text. This tool converts your text into all nine standard case formats simultaneously, so you can copy whichever one you need.

All 9 Case Formats - When to Use Each

CaseExamplePrimary Use
UPPERCASEHELLO WORLDConstants, acronyms, emphasis, shouting in informal writing, database column names in SQL
lowercasehello worldHTML attributes, CSS class names (before kebab-case), email addresses, Unix filenames
camelCasehelloWorldJavaScript, TypeScript, Java variables and function names; JSON property keys; React props
PascalCaseHelloWorldClass names in most OOP languages (Python, Java, C#, TypeScript); React component names; C# methods
snake_casehello_worldPython variables and functions; Ruby; database column names; Linux/Unix file and directory names
kebab-casehello-worldHTML/CSS class names; URL slugs; npm package names; HTML data attributes; file names in web projects
CONSTANT_CASEHELLO_WORLDConstants in Python (PEP 8); environment variables (.env files); configuration keys; Redux action types
Title CaseHello WorldArticle headlines; book titles; UI headings; product names; any formal heading in English writing
Sentence caseHello worldBody text, descriptions, tooltips, UI labels, informal headings, email subjects

Available Case Conversions

UPPERCASE

Convert all characters to uppercase

Example: HELLO WORLD
lowercase

Convert all characters to lowercase

Example: hello world
camelCase

First word lowercase, subsequent words capitalized, no spaces

Example: helloWorld
PascalCase

All words capitalized, no spaces

Example: HelloWorld
snake_case

Words separated by underscores, all lowercase

Example: hello_world
kebab-case

Words separated by hyphens, all lowercase

Example: hello-world
CONSTANT_CASE

Words separated by underscores, all uppercase

Example: HELLO_WORLD
Title Case

First letter of each word capitalized

Example: Hello World
Sentence case

First letter capitalized, rest lowercase

Example: Hello world

Frequently Asked Questions - Case Converter

What's the difference between camelCase and PascalCase?

camelCase starts with a lowercase letter (helloWorld), while PascalCase (also called UpperCamelCase) starts with an uppercase letter (HelloWorld). In JavaScript and TypeScript, camelCase is used for variables, functions, and object properties, while PascalCase is used for class names and React component names.

When should I use snake_case vs kebab-case?

snake_case (underscores) is the standard in Python (PEP 8 style guide) for variable and function names, and is widely used for database column names. kebab-case (hyphens) is standard in CSS class names, HTML attributes, URL slugs, and npm package names. The key difference: hyphens are valid in URLs and CSS but not in most programming language identifiers; underscores are valid in identifiers but not in URLs.

What is CONSTANT_CASE used for?

CONSTANT_CASE (SCREAMING_SNAKE_CASE) is the standard for constants - values that never change - in Python (PEP 8), environment variables (.env files), Redux action type strings, and configuration keys. In JavaScript/TypeScript, it signals to other developers that a value should not be reassigned.

How does the converter handle special characters and punctuation?

For programming cases (camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE), special characters and punctuation are removed since they are not valid in most programming language identifiers. For text cases (UPPERCASE, lowercase, Title Case, Sentence case), all characters including punctuation are preserved and only the capitalization changes.

Can I convert multi-line text?

Yes. Paste any amount of text - multi-line paragraphs, code snippets, or lists. The converter processes the entire input and shows results for all nine formats simultaneously. Use fullscreen mode for better visibility when working with large amounts of text.

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