Case Converter

Convert text between uppercase, lowercase, title case, and sentence case instantly.

What This Tool Does

Converts text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case — instantly in your browser.

Who This Is For

Developers renaming variables, functions, or classes to match naming convention requirements
Content writers reformatting headlines and titles for SEO or style guide compliance
Data engineers normalizing text fields in datasets before processing
Anyone who receives text in the wrong case and needs a quick conversion

Example: Input: The text hello world example text → Output: camelCase: helloWorldExampleText · PascalCase: HelloWorldExampleText · snake_case: hello_world_example_text — all simultaneously

UPPERCASE

lowercase

Title Case

Sentence case

Click any box to copy

💡 After converting case, check your word count with the Word Counter — it also gives reading time and sentence count. To compare the converted text against an original version, Text Compare highlights every difference between two text blocks.

How to Convert Text Case Online

Using the case converter is instant. Paste or type your text into the input box, then click any case button — the converted result appears immediately in the output panel. Use the Word Counter to check the text length after converting. You can convert the same text to multiple formats without re-entering it.

The tool handles Unicode characters, punctuation, and mixed-language text correctly. Numbers and special characters are preserved exactly as entered.

Paste your text into the input field
Click the target case button: UPPERCASE, lowercase, Title Case, camelCase, etc.
Copy the result from the output panel with one click
Convert to another format immediately — no need to re-paste

When Each Case Style Is Used

Case Style	Example	Common Uses
UPPERCASE	HELLO WORLD	Headings, constants, acronyms, emphasis
lowercase	hello world	Email addresses, URLs, CSS class names
Title Case	Hello World	Article titles, headings, proper nouns
Sentence case	Hello world	Normal prose, body text
camelCase	helloWorld	JavaScript variables, JSON keys
PascalCase	HelloWorld	Class names in most programming languages
snake_case	hello_world	Python variables, database column names
kebab-case	hello-world	CSS classes, HTML attributes, URL-encode the slug after converting to kebab-case

camelCase vs snake_case vs kebab-case — Which Should You Use?

The right naming convention depends entirely on the context:

camelCase is the standard for JavaScript variables, object keys, and function names. React component props use camelCase by convention.
snake_case is standard in Python for variables, functions, and module names. PostgreSQL and many SQL databases also prefer snake_case for column names.
kebab-case is used in CSS class names, HTML data attributes, and URL-encode the slug after converting to kebab-case because hyphens are valid in those contexts but underscores can cause issues.
PascalCase is reserved for class names in JavaScript, TypeScript, C#, Java, and most object-oriented languages. React component names must use PascalCase.
SCREAMING_SNAKE_CASE is the universal convention for constants and environment variables in most languages.

Consistency matters more than which convention you choose. Need to compare a renamed version against the original? Text Compare highlights every difference. Pick one per context and apply it everywhere.

Handling Edge Cases in Case Conversion

Most simple case converters break on edge cases. Here is how common issues are handled:

Acronyms in Title Case — words like "API", "URL", and "HTML" are typically preserved in caps rather than converted to "Api".
Apostrophes — "don't" in Title Case becomes "Don't", not "Don'T".
Mixed scripts — Latin, Cyrillic, and Greek characters have defined upper/lower mappings; CJK characters (Chinese, Japanese, Korean) are unaffected.
Numbers and symbols — digits and punctuation pass through unchanged in all case modes.
camelCase splitting — converting "helloWorld" to another format requires camelCase detection; the tool handles this automatically.

Text Transformation Workflow

Case conversion is part of a text processing and development workflow:

Count words after converting to verify length
Compare before and after to review all changes
URL-encode kebab-case slugs for safe use in URLs
Format SQL with properly cased keywords

Frequently Asked Questions

What case styles are supported?▼

UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, SCREAMING_SNAKE_CASE, and kebab-case. All conversions are applied to the entire input text.

What's the difference between Title Case and Sentence case?▼

Title Case capitalizes every major word: The Quick Brown Fox. Sentence case capitalizes only the first word of each sentence: The quick brown fox. Sentence case uses punctuation to detect sentence boundaries.

What's the difference between camelCase and PascalCase?▼

camelCase: firstWordLower, SubsequentWordsCapitalized. PascalCase (also called UpperCamelCase): AllWordsCapitalized including the first. PascalCase is common for class names in most languages; camelCase is common for variable and function names.

Does the converter handle special characters and accented letters?▼

Yes — accented characters (é, ü, ñ) are handled correctly for uppercase/lowercase conversion. Symbols and punctuation are preserved unchanged.

Can I convert variable names between coding styles?▼

Yes — paste a list of variable names or identifiers and convert between snake_case, camelCase, PascalCase, and kebab-case in one step. Useful when switching between languages that use different naming conventions.

Does it change the capitalization inside URLs or code?▼

The converter applies case rules to all text. If your input contains code or URLs that should not be converted, separate them before converting and recombine afterward.

What is sentence case?▼

Sentence case capitalizes only the first letter of each sentence, like normal prose.

How It Works

Paste your textPaste or type the text you want to convert into the input area.

Select a case styleChoose from UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, or kebab-case.

Copy the converted textClick the output to select all, then copy. Or click Copy button for instant clipboard copy.

When to Use This Tool

→Fixing copy-pasted text that has inconsistent or incorrect capitalization
→Converting variable names between camelCase and snake_case when switching languages
→Generating title-cased headings for articles, presentations, or navigation menus
→Converting ALL CAPS text from a legacy system into readable sentence case

🔒 Privacy & Security

Case conversion runs in your browser's JavaScript engine. No text is uploaded. For text containing names, addresses, or any personal data that needs reformatting, local conversion keeps that data private.

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