Text Tools

Case Converter

Transform text between every common letter-case style instantly. Perfect for developers renaming variables, content creators generating URL slugs, editors fixing all-caps emails, or anyone needing consistent text formatting. Ten different case styles handle any conversion need.

JavaScript Required

This tool requires JavaScript to run. Please enable JavaScript in your browser settings to use Case Converter.

Why JavaScript? This tool processes your files entirely in your browser using WebAssembly — nothing is uploaded to servers. This privacy-first approach requires JavaScript to be enabled.

What does this tool do?

The Case Converter transforms text between different capitalization and word-separation conventions. It intelligently detects word boundaries in various input formats — whether words are separated by spaces, joined in camelCase, or connected with underscores or hyphens. The output is available in ten formats: UPPERCASE (all caps), lowercase (no caps), Title Case (First Letter Caps), Sentence case (First letter only), camelCase (lowercaseFirst), PascalCase (UppercaseFirst), snake_case (lower_with_underscores), kebab-case (lower-with-hyphens), CONSTANT_CASE (UPPER_WITH_UNDERSCORES), and aLtErNaTiNg CaSe for playful effects.

How it works

The tool analyzes input text to identify word boundaries using multiple heuristics: whitespace detection, case transitions (camelCase/PascalCase boundaries), and separator characters (underscores, hyphens). Once words are identified, it applies the selected case transformation rules: uppercase/lowercase conversion, title casing rules (keeping small words lowercase in titles), and appropriate separator insertion. The result updates live as you type, with copy-to-clipboard functionality for each output format.

Features

Ten conversion styles: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, aLtErNaTiNg
Instant conversion as you type
Smart word splitting — handles 'myVar' AND 'kebab-case' AND 'snake_case'
Copy to clipboard with one click
Runs entirely in your browser
Preserves numbers and special characters
Batch convert large text blocks

How to use

1

Paste or type your text

Enter any text into the input box — single words, sentences, paragraphs, code variable names, or entire documents.
2

Select a case style

Click any of the ten case-style buttons. The output instantly shows your text transformed to that convention.
3

Copy the result

Click Copy on the output box, or select and copy the text. Paste into your document, code editor, or application.
4

Try different styles

Experiment with multiple styles to find the best fit. The input text stays unchanged so you can switch between outputs freely.

Common use cases

Code refactoring

Developers quickly rename variables between camelCase, PascalCase, snake_case, and CONSTANT_CASE to match different language conventions or team style guides.

Content formatting

Editors convert screaming all-caps emails to readable sentence case, or transform titles between Title Case and sentence case for different contexts.

URL slug generation

Convert article titles or product names to kebab-case for clean, SEO-friendly URL slugs.

Data normalization

Standardize text data from multiple sources into consistent case for databases, spreadsheets, or analysis.

Tips & best practices

camelCase starts with lowercase (myVariable); PascalCase starts uppercase (MyVariable) — use Pascal for class names, camel for variables
Title Case keeps small words (a, an, the, and, but) lowercase unless they're the first word
kebab-case is ideal for URLs and CSS class names; snake_case is common in Python and Ruby
CONSTANT_CASE (ALL_CAPS_WITH_UNDERSCORES) is standard for environment variables and configuration keys

Frequently asked questions

What's the difference between camelCase and PascalCase?

camelCase starts with a lowercase letter (myVariableName, getUserData). PascalCase starts with an uppercase letter (MyVariableName, GetUserData). They're otherwise identical. Use camelCase for JavaScript variables, PascalCase for class names.

Will it preserve numbers?

Yes — numbers are kept in place exactly as they appear. Only letters are case-shifted. 'user123Name' becomes 'user123_name' in snake_case with numbers intact.

Does it work on non-Latin scripts?

Uppercase/lowercase conversion works for any script that has case (Cyrillic, Greek). Scripts without case (Chinese, Japanese, Arabic) pass through unchanged. Word-based modes split on spaces and case-change boundaries.

How does it detect word boundaries?

Multiple methods: spaces obviously separate words; underscores and hyphens are word separators; case changes indicate boundaries in camelCase/PascalCase (myVariable → my + Variable); consecutive uppercase followed by lowercase handles acronyms (HTTPServer → HTTP + Server).