Case Converter

Case Converter

Instantly convert any text between nine popular formats: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and aLtErNaTiNg case. Type or paste your text and every conversion appears at once -- perfect for developers, writers, and anyone who needs to reformat strings quickly without writing a single line of code.

How Case Conversion Works

Each format applies a distinct transformation rule to the input string. UPPERCASE maps every character to its capital form using Unicode uppercase rules. lowercase does the reverse. camelCase strips spaces and punctuation, lowercases the first word, then capitalizes the first letter of every following word (e.g., "order total amount" becomes "orderTotalAmount"). PascalCase does the same but also capitalizes the first word. snake_case replaces every space and special character with an underscore and lowercases all characters. kebab-case uses hyphens instead of underscores. Title Case capitalizes the first letter of every word above a short-word threshold (skipping "a", "the", "of", etc.). Sentence case capitalizes only the very first character and proper nouns.

Worked Examples

Scenario 1 -- Developer renaming a database column A backend developer needs to expose a SQL column called first_name as a JSON field. The API convention is camelCase, so first_name (snake_case) becomes firstName (camelCase). Paste the column list, convert, and copy in under 10 seconds.

Scenario 2 -- Writer formatting article headlines A content editor receives draft headings in plain lowercase: "how to build a budget in 2025". Title Case produces "How to Build a Budget in 2025" and Sentence case produces "How to build a budget in 2025". The editor picks whichever matches the publication style guide.

Scenario 3 -- CSS class name migration A design system is migrating from BEM (block__element--modifier in kebab-case) to a new framework that expects PascalCase component names. Pasting "hero-card--featured" and switching to PascalCase gives "HeroCardFeatured" -- ready for the new import.

Case Format Reference Table

When to Use This Tool

• You are switching a codebase between languages and need to rename 50+ variables from snake_case to camelCase in bulk
• A style guide change requires converting all existing CSS class names from camelCase to kebab-case
• You are writing titles or blog headings and need to confirm Title Case capitalization quickly
• You need to format a list of database column names as JSON keys for an API response
• You want to generate a URL slug from a plain-English heading -- paste, convert to kebab-case, done

Common Mistakes

1. Assuming PascalCase and Title Case are the same. Title Case preserves spaces and skips short words; PascalCase removes spaces entirely and capitalizes every word including "a", "of", and "the".
2. Using kebab-case in JavaScript variable names. Hyphens are subtraction operators in JS. my-variable evaluates as my minus variable. Use camelCase for variables and reserve kebab-case for CSS and URLs.
3. Forgetting that UPPER_SNAKE_CASE differs from UPPERCASE. HELLOWORLD (UPPERCASE) and HELLO_WORLD (UPPER_SNAKE_CASE) are different tokens. Constants in most languages follow the snake variant.
4. Mixing conventions within a single project. A codebase that uses both getUserData and get_user_data for similar functions is harder to search and maintain. Standardize before scaling.

Context and Applications

Text case formatting matters in three main areas. In software development, naming conventions are enforced by linters like ESLint (camelCase for JS), Pylint (snake_case for Python), and stylelint (kebab-case for CSS). Violating them triggers warnings that slow down code reviews. In content publishing, style guides -- APA, Chicago, AP -- each have slightly different Title Case rules. APA skips words under four letters; AP capitalizes all words of four or more letters. In SEO and URLs, search engines treat hyphens as word separators, so "best-running-shoes" is indexed as three words. Underscores are treated as word joiners, making "best_running_shoes" a single token. kebab-case is the correct choice for URL slugs.

Tips

1. Paste an entire list of variable or column names separated by newlines to convert them all at once
2. When migrating from Python to JavaScript, use snake_case → camelCase as a baseline, then check property names that start with numbers or contain symbols
3. For CSS class names following BEM conventions, convert component names to kebab-case and use double hyphens for modifiers manually after conversion
4. Title Case output here follows standard convention -- if your style guide is APA or AP, verify the few edge-case words (prepositions four letters or longer) manually
5. kebab-case slugs work best for SEO -- convert your page title to kebab-case, strip stop words, and use the result as your URL path
6. Save time by opening this page in a browser tab pinned alongside your code editor during refactoring sessions