Free Text Case Converter Online

A case converter transforms text between different letter case formats instantly. Instead of manually editing each word or writing a script, paste your text and switch between UPPER CASE, lower case, Title Case, camelCase, PascalCase, snake_case, kebab-case, and more in one click.

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The tool supports the full range of case formats used across writing and coding. UPPER CASE is used for headings, constants, and emphasis. lower case is used for general text, emails, and SQL keywords. Title Case is the standard for article headings and book titles. Sentence case capitalizes only the first word — increasingly preferred in modern product UIs and design systems. camelCase is the JavaScript community standard for variable names, function names, and JSON property keys. PascalCase (also called UpperCamelCase) is required for class names, TypeScript interfaces, and React components — React treats lowercase component names as HTML elements. snake_case is the Python convention for variables, functions, and module names (PEP 8), and the standard for database column names in PostgreSQL and most SQL databases. SCREAMING_SNAKE_CASE is used for constants in Python, environment variables in .env files, and C/C++ macros. kebab-case is the standard for CSS class names, HTML id attributes, URL slugs, and npm package names — avoid it for JavaScript variables since hyphens are subtraction operators.

Developers frequently need to convert between naming conventions when working across layers of the stack. A Python backend returns user_first_name in snake_case; the JavaScript frontend needs userFirstName in camelCase. A URL slug like my-component-name needs to become MyComponentName as a PascalCase React component. A database column created_at becomes createdAt in a JSON API response. A filename api_base_url.env becomes API_BASE_URL as an environment variable constant. This tool handles all of these conversions in one place.

Title case has nuances that differ across style guides. AP Style capitalizes all words except short articles, prepositions, and coordinating conjunctions unless they are the first or last word. Chicago Style is similar but capitalizes prepositions of four or more letters. APA Style capitalizes all major words. Our title case converter follows AP style as the most widely-used convention for web and editorial content.