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Text Case Converter

Convert text between different case formats commonly used in programming, writing, and data processing

Input Text

Enter text to convert between different cases

Converted Results

All case format variations

Converted text will appear here

About Text Case Converter

Convert text between different case formats commonly used in programming, writing, and data processing. Perfect for developers, writers, and data analysts. All processing happens in your browser - no data is sent to any server.

Why Use This Tool?

  • ✓ Convert variable names between programming conventions instantly - transform snake_case Python variables to camelCase JavaScript, PascalCase C# classes, or kebab-case CSS without manual retyping, essential for cross-language refactoring
  • ✓ Fix inconsistent naming in codebases - batch convert variables/functions to match style guide (Google uses camelCase, Python PEP8 uses snake_case), ensure consistency across team contributions without tedious manual editing
  • ✓ Format text for different contexts - UPPERCASE for constants/env vars, Title Case for headings, Sentence case for UI text, lowercase for URLs/tags, proper formatting without retyping saves time in documentation and content creation
  • ✓ Generate API endpoint paths and database column names - convert natural language ("User Profile") to kebab-case URLs (user-profile), snake_case database columns (user_profile), or camelCase JSON keys (userProfile) following conventions
  • ✓ Quickly test case sensitivity issues - compare how text appears in different cases to debug case-sensitive bugs in file systems (Linux vs Windows), URLs, database queries, or programming language keywords

Case Types

  • UPPERCASE: All letters capitalized
  • lowercase: All letters in lowercase
  • camelCase: First word lowercase, rest capitalized
  • snake_case: Lowercase with underscores
  • kebab-case: Lowercase with hyphens

Common Questions

  • Q: When should I use camelCase vs snake_case vs kebab-case? Language/context conventions: camelCase = JavaScript, Java, C# (myVariableName), TypeScript. snake_case = Python, Ruby, SQL (my_variable_name), Rust, database columns. kebab-case = URLs, CSS classes, HTML attributes (my-variable-name), file names. PascalCase = classes in most languages (MyClassName), React components. SCREAMING_SNAKE_CASE = constants, environment variables (MY_CONSTANT). Follow language conventions - don't use snake_case in JavaScript or camelCase in Python. Tools like ESLint/Pylint enforce conventions. Mixed conventions in same codebase confuse teammates and look unprofessional.
  • Q: How do case converters handle acronyms and numbers? No universal standard, tools vary. Common approaches for 'XMLHttpRequest': camelCase → xmlHttpRequest or xmlhttpRequest. PascalCase → XmlHttpRequest or XMLHttpRequest. Recommendation: treat acronyms as words (XmlHttpRequest) for readability, unless language convention says otherwise. Numbers: usually kept together (base64Encode), not split (base64encode). Hyphens/underscores before numbers: data_2024 or data-2024 (not data2024). Edge cases cause inconsistency - test your specific tool's behavior with your use case.
  • Q: What's the difference between Title Case and Sentence case? Title Case = Capitalize First Letter Of Every Word (except articles/prepositions like 'the', 'of', 'in' in formal title case). Used for: headings, book titles, article headlines. Sentence case = Capitalize first word only (like regular sentence). Used for: UI labels, button text, form fields, modern minimalist design. Trend: modern UIs favor sentence case (less shouty, more readable). Title case rules vary: Chicago Manual vs AP Stylebook differ on which words to capitalize. This tool may use simple title case (all words capitalized) or smart title case (follows style guide).
  • Q: Can this tool preserve word boundaries when converting? Depends on input format. Converting 'user_profile' (snake_case) to camelCase = easy (userProfile). Converting 'userprofile' (no delimiters) = impossible (tool can't guess word boundaries - could be user Profile or use RProfile). For best results: input should have word boundaries (spaces, underscores, hyphens, or camelCase). If converting from single-word lowercase, manually add delimiters first. Some tools use dictionary lookups to guess boundaries, but unreliable for domain-specific terms.
  • Q: Why do some languages prefer different naming conventions? Historical/cultural reasons. C/Unix tradition = snake_case (POSIX APIs, system calls). Java = camelCase (influenced by Smalltalk). Python = snake_case (PEP 8 for readability - creator Guido finds underscores clearer than camelCase). JavaScript = camelCase (Java influence despite name similarity). CSS = kebab-case (attributes use hyphens, underscores have special meaning). Go = mixed (PascalCase for exported, camelCase for unexported). Consistency within language ecosystem matters more than universal convention. Follow community standards, not personal preference.

Pro Tips & Best Practices

  • 💡 Use consistent casing conventions across your entire codebase: Mixing conventions (user_name in Python file, userName in JavaScript file for same concept) causes confusion and refactoring pain. Establish style guide: JavaScript = camelCase for variables/functions, PascalCase for classes/components. Python = snake_case for variables/functions, PascalCase for classes. Enforce with linters (ESLint, Pylint, rustfmt). Document conventions in CONTRIBUTING.md. When integrating APIs using different conventions, convert at boundary (API uses snake_case, convert to camelCase at interface layer).
  • 💡 Use SCREAMING_SNAKE_CASE for constants and environment variables: Constants (values that never change) and environment variables should stand out: SCREAMING_SNAKE_CASE = MAX_RETRIES, API_KEY, DATABASE_URL (visually distinct from variables). camelCase/snake_case = regular variables (maxRetries confusing - is it constant or variable?). Most languages allow this convention even if using different styles for other identifiers. Makes grepping for configuration easy: grep -r 'API_KEY' vs harder to find mixed-case variants. Environment variables universally use SCREAMING_SNAKE_CASE across platforms.
  • 💡 Convert database column names and JSON keys to match language conventions: Don't match database column naming to backend language - causes confusion. Best practice: database uses snake_case (SQL standard, case-insensitive, readable), backend converts to language convention (Python keeps snake_case, JavaScript converts to camelCase). Use ORMs (Sequelize, SQLAlchemy) to auto-convert. For APIs: database stores user_full_name, Python uses user_full_name, REST API returns {"userFullName": ...} (camelCase for JavaScript clients). Conversion layer prevents mixing conventions in single context.
  • 💡 Use kebab-case for URLs and file names to avoid issues: URLs and file names should use kebab-case (my-page-name): (1) Case-insensitive file systems (Windows) treat MyFile.txt and myfile.txt as same. (2) URLs are case-sensitive (domain is not, path is), but best practice = lowercase for consistency. (3) Underscores in URLs harder to see when underlined (user_profile looks like userprofile). (4) Spaces in URLs must be encoded (%20). Kebab-case avoids all issues: lowercase (case-insensitive safe), no underscores (visible), no spaces (no encoding). Used by GitHub, npm, most URL slugs.
  • 💡 Be aware of case-sensitivity differences across systems: Case sensitivity causes cross-platform bugs: Linux file systems = case-sensitive (User.txt ≠ user.txt, can coexist). Windows/macOS = case-insensitive (User.txt and user.txt are same file, but macOS preserves case). Git on Windows = case-insensitive by default (renaming MyFile.txt → myfile.txt may not register as change). URLs = path case-sensitive (domain not): site.com/Page ≠ site.com/page. To avoid issues: use lowercase for all file names/URLs, enforce with linters, test on case-sensitive system (Linux CI).

When to Use This Tool

  • Cross-Language Refactoring: Convert Python snake_case variables to JavaScript camelCase when porting code, transform C# PascalCase to Go naming conventions during migration, batch convert naming conventions when integrating codebases from different teams
  • API Development: Convert database column names (snake_case) to JSON API keys (camelCase) following conventions, generate URL endpoints from feature names (kebab-case), create consistent naming across API request/response schemas
  • Content & Documentation: Convert headings to Title Case for documentation and blog posts, format UI text to Sentence case for modern design systems, standardize variable names in code examples across different languages
  • Database Design: Convert natural language field names to snake_case for SQL columns, generate consistent table and column naming from requirements documents, format database identifiers following PostgreSQL/MySQL conventions
  • CSS & HTML: Convert component names to kebab-case for CSS classes and HTML attributes, generate BEM naming (block__element--modifier) with consistent casing, format data attributes and custom element names
  • Configuration & Environment: Convert setting names to SCREAMING_SNAKE_CASE for environment variables, format configuration keys following platform conventions (Docker, Kubernetes), standardize constant names across config files

Related Tools

  • Try our Regex Tester to create patterns for finding and replacing different case formats in code
  • Use our URL Encoder/Decoder to properly encode spaces and special characters in URLs with different cases
  • Check our JSON Formatter to format JSON with camelCase keys following JavaScript conventions
  • Explore our CSV Formatter to format CSV data with consistent column name casing

Quick Tips & Navigation