What is a Text Case Converter?
A text case converter is a tool that transforms text between different capitalization and formatting styles. It automatically converts strings to various case formats used in writing, programming, and data formatting. Case converters are essential for developers converting variable names between naming conventions, content writers formatting titles and headings, and anyone needing to quickly change text capitalization. Our online text case converter supports 10 different formats including UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Sentence case, and dot.case, with real-time conversion and preview capabilities.
Why Use Our Text Case Converter?
- Secure & Private: All conversion happens in your browser - no data sent to servers
- 10+ Case Formats: Support for all common text cases and programming naming conventions
- Real-Time Conversion: Instant auto-conversion as you type with toggle option
- Preview All Formats: See all 10 case formats simultaneously for quick comparison
- Character Counting: Track characters, words, lines, and sentences
- One-Click Copy: Copy converted text to clipboard instantly
- Text Examples: Pre-built examples for common use cases
Text Case Formats Explained
UPPERCASE: All letters converted to capitals (HELLO WORLD). Used for headings, acronyms, constants, and emphasis in text.
lowercase: All letters converted to lowercase (hello world). Used for general text, URLs, and certain programming conventions.
Title Case: First letter of each word capitalized (Hello World). Standard for book titles, article headlines, and proper formatting in writing.
Sentence case: First letter of each sentence capitalized (Hello world. This is text.). Natural text format for paragraphs and standard writing.
camelCase: First word lowercase, subsequent words capitalized, no spaces (helloWorld). Standard for JavaScript variables, Java methods, and TypeScript properties.
PascalCase: All words capitalized, no spaces (HelloWorld). Used for class names, component names, and type definitions in programming.
snake_case: All lowercase with underscores (hello_world). Common in Python, Ruby, database columns, and configuration files.
kebab-case: All lowercase with hyphens (hello-world). Popular in URLs, CSS class names, HTML attributes, and file names.
CONSTANT_CASE: All uppercase with underscores (HELLO_WORLD). Standard for constants and environment variables in programming.
dot.case: All lowercase with dots (hello.world). Used in package names, namespaces, and certain configuration keys.
Programming Naming Conventions
JavaScript/TypeScript: Use camelCase for variables and functions (getUserData), PascalCase for classes and components (UserProfile), CONSTANT_CASE for constants (MAX_RETRY_COUNT).
Python: Use snake_case for variables and functions (get_user_data), PascalCase for classes (UserProfile), CONSTANT_CASE for constants (MAX_RETRY_COUNT).
Java/C#: Use camelCase for variables and methods (getUserData), PascalCase for classes and interfaces (UserProfile), CONSTANT_CASE for constants (MAX_RETRY_COUNT).
Ruby: Use snake_case for variables, methods, and file names (get_user_data), PascalCase for classes (UserProfile), CONSTANT_CASE for constants (MAX_RETRY_COUNT).
Database: Typically use snake_case for table and column names (user_first_name, order_items), though conventions vary by organization.
CSS: Use kebab-case for class names and IDs (btn-primary, user-profile-card). Some modern frameworks use camelCase or PascalCase.
Common Use Cases
- Variable Renaming: Convert between naming conventions when refactoring code or switching languages
- API Development: Format endpoint names and parameter keys consistently (kebab-case for URLs, camelCase for JSON)
- Database Design: Convert column names to snake_case convention
- Content Writing: Format headlines in Title Case, convert SHOUTING text to normal case
- CSS/HTML: Convert component names to kebab-case for class names
- File Naming: Convert to kebab-case or snake_case for consistent file organization
- Configuration Files: Format keys in appropriate case (dot.case, snake_case, CONSTANT_CASE)
- Code Migration: Convert naming conventions when migrating between frameworks or languages
Title Case vs Sentence Case
Title Case capitalizes the first letter of every word (except minor words like articles and prepositions in formal title case). It's used for book titles, article headlines, section headings, and formal names. Example: "The Quick Brown Fox Jumps Over The Lazy Dog".
Sentence case capitalizes only the first letter of each sentence, just like normal written text. It's more casual and commonly used in body text, descriptions, and modern web content. Example: "The quick brown fox jumps over the lazy dog. This is another sentence."
When to use which: Use Title Case for formal headings, book/article titles, and when following traditional publishing standards. Use Sentence case for body content, UI text, modern blog titles, and informal headings. Many modern style guides prefer sentence case for its readability.
camelCase vs PascalCase vs snake_case
camelCase (lowerCamelCase): Starts with lowercase, capitalizes subsequent words (myVariableName). Most common for variables, functions, and methods. Easy to read, no special characters, widely adopted in JavaScript, Java, C++.
PascalCase (UpperCamelCase): All words start with uppercase (MyClassName). Used for classes, types, components, and constructors. Distinguishes definitions from instances. Standard in C#, Java classes, React components.
snake_case: All lowercase with underscores (my_variable_name). More readable for some, matches natural word spacing. Common in Python, Ruby, SQL, and scripting. Database columns typically use snake_case.
Choosing between them: Follow your language's conventions. JavaScript uses camelCase for variables, PascalCase for classes. Python uses snake_case for almost everything except classes (PascalCase). When migrating code or working across languages, convert appropriately.
Best Practices for Text Case
1. Be consistent: Choose one convention and stick to it throughout your project. Mixing camelCase and snake_case in the same codebase creates confusion.
2. Follow language conventions: Don't fight the ecosystem. Use the naming conventions standard for your programming language and framework.
3. Avoid mixing cases: Never mix formats like camelCase_withSnake or PascalCase-with-kebab. Pick one format per context.
4. Consider readability: Very long identifiers are more readable in snake_case (calculate_total_customer_order_value) vs camelCase (calculateTotalCustomerOrderValue).
5. Use CONSTANT_CASE for constants: Make immutable values obvious with UPPERCASE_WITH_UNDERSCORES across all languages.
6. URL-safe names: Use kebab-case for URLs, slugs, and file names to avoid encoding issues and improve SEO.
Converting Between Formats
From natural text to code: "user profile data" → userProfileData (camelCase), UserProfileData (PascalCase), user_profile_data (snake_case), user-profile-data (kebab-case).
From snake_case to camelCase: Remove underscores, capitalize first letter of each word except the first: user_first_name → userFirstName.
From kebab-case to PascalCase: Remove hyphens, capitalize first letter of every word: user-profile-card → UserProfileCard.
From camelCase to snake_case: Insert underscore before capital letters, convert to lowercase: getUserData → get_user_data.
Handling acronyms: In camelCase/PascalCase, treat acronyms as single words: HTML → html (in htmlParser) or HTML (in HTMLParser). In snake_case: html_parser.
Common Case Conversion Mistakes
Mistake 1: Capitalizing articles in Title Case
Incorrect: The Quick Brown Fox
Correct (formal): The Quick Brown Fox (some style guides lowercase "the" unless it's the first word)
Mistake 2: Using spaces in programming names
Incorrect: user first name (breaks in code)
Correct: userFirstName, user_first_name, or user-first-name
Mistake 3: Inconsistent constant naming
Incorrect: maxRetryCount or Max_Retry_Count
Correct: MAX_RETRY_COUNT
Mistake 4: Wrong separators for context
Incorrect: user_profile.html (mixing conventions)
Correct: user-profile.html (kebab-case for file names)
Mistake 5: Not preserving acronyms properly
Depends on convention: API → api, Api, or API (be consistent)
Frequently Asked Questions
Which case format is best for URLs?
kebab-case is the standard for URLs and web slugs (example.com/blog-post-title). It's URL-safe, readable, and preferred by search engines. Avoid underscores in URLs as they can cause SEO issues.
Can I convert multiple paragraphs at once?
Yes, the converter handles multi-line text and preserves line breaks. Sentence case will properly capitalize the first letter of each sentence, while other formats may treat the entire text as one unit.
What happens to special characters and numbers?
For programming cases (camelCase, snake_case, etc.), special characters and spaces are removed or converted to separators. Numbers are preserved. For text cases (UPPERCASE, Title Case), special characters and numbers remain unchanged.
Why is my Title Case not capitalizing every word?
Our Title Case implementation capitalizes the first letter of each word separated by spaces. Formal title case rules (which lowercase articles and prepositions) vary by style guide and aren't universally standardized.
Should I use camelCase or snake_case for JSON keys?
camelCase is the JavaScript convention and most common for JSON APIs (userName, orderTotal). However, some APIs use snake_case for consistency with backend languages like Python (user_name, order_total). Choose one and be consistent across your API.