Text Tool

Text Case Converter

Instantly convert your text to any case format — UPPERCASE, lowercase, Title Case, camelCase, and more.

Input Text Max 15,000 chars

0/15000 charactersPremium: 50000 chars

0 / 15,000 characters

Case Type

Converted Output

Your converted text will appear here...

Introduction

Inconsistent capitalization is the silent killer of professional formatting—think of a mailing list where half the names are 'john smith' and the other half are 'JOHN SMITH', or a codebase where constants randomly alternate between camelCase and UPPER_SNAKE_CASE. A text case converter applies uniform capitalization rules to an entire body of text in one operation, supporting the seven standard case formats that cover virtually every typographic and programmatic convention. Rather than retyping or manually fixing each word, you paste the text and select the target case.

What Is Text Case Converter?

A text case converter is a string-transformation utility that applies capitalization rules to every character in the input according to the selected format. The seven supported formats each serve distinct domains: UPPERCASE and lowercase are typographic conventions for emphasis or normalization; Title Case capitalizes the first letter of each word (with configurable exception lists for articles and prepositions); Sentence case capitalizes only the first letter after a period, question mark, or exclamation point; camelCase, PascalCase, and UPPER_SNAKE_CASE are programmatic naming conventions used in source code, configuration files, and database schemas.

The tool exists because manual case conversion is both tedious and error-prone, especially for Title Case and Sentence case, which require linguistic awareness. Title Case must know which words to leave lowercase (articles, short prepositions, conjunctions) unless they appear as the first or last word of a sentence. Sentence case must detect sentence boundaries accurately—including abbreviations like 'Dr.' and 'U.S.' that contain periods but don't end sentences. A converter that handles these edge cases programmatically produces more consistent results than a human who inevitably misses exceptions.

Programmatic case conversion (camelCase, PascalCase, UPPER_SNAKE_CASE) addresses a different problem: renaming identifiers across codebases or transforming data-field names between API conventions. A JSON API that returns snake_case keys can be converted to camelCase for a JavaScript frontend in one paste, or a database column named 'user_first_name' can become 'UserFirstName' for a C# model class. The converter recognizes word boundaries at spaces, hyphens, underscores, and camelCase transitions, ensuring accurate splitting regardless of the source format.

Text Case Converter Examples

Input	Output
the quick brown fox jumps over the lazy dog	UPPERCASE: THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG
hello world from toolmetry	Title Case: Hello World From Toolmetry
user_first_name	camelCase: userFirstName \| PascalCase: UserFirstName
dr. smith went to washington, d.c. last tuesday.	Sentence case: Dr. Smith went to Washington, D.C. last Tuesday.

Key Features of Text Case Converter

Seven case formats: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, UPPER_SNAKE_CASE
Configurable Title Case exception list for articles, prepositions, and conjunctions (a, an, the, in, on, at, etc.)
Sentence boundary detection that respects abbreviations (Dr., Mr., U.S., etc.) to prevent false capitalization resets
Word-boundary parsing at spaces, hyphens, underscores, and camelCase transitions for accurate programmatic conversion
Real-time conversion that updates the output as you type without a submit action
Batch mode that processes multiple paragraphs while maintaining paragraph breaks in the output
One-click copy and .txt download for immediate use of the converted text

How It Works

Paste or Type Your Text

Enter the text you want to transform into the input area. The tool accepts any length of text, from a single word to entire paragraphs, and preserves your original spacing and line breaks throughout the conversion process.

Choose Your Target Case Format

Select from UPPER CASE, lower case, Title Case, camelCase, PascalCase, snake_case, or other supported formats. The converter applies language-aware rules for Title Case, correctly capitalizing articles and prepositions only when they appear at the start of a sentence.

Copy the Converted Result Instantly

The transformed text appears immediately in the output area as you switch between case formats. Copy the result with one click and paste it directly into your document, code editor, or spreadsheet without any additional cleanup needed.

Who Uses This

Programmers

converting variable names between camelCase, snake_case, and PascalCase when refactoring code or integrating APIs that use different naming conventions across services

Copy Editors

fixing accidentally typed ALL CAPS paragraphs or inconsistently capitalized headlines back to proper title case for publication-ready articles

Social Media Managers

transforming drafted social copy into the specific case style their brand guidelines require before scheduling posts across multiple platforms

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Frequently Asked Questions

Which case formats does the converter support?

The tool supports UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, and constant CASE. Each format follows its standard convention, such as camelCase lowercasing the first word and capitalizing subsequent words.

Does Title Case handle small words like articles and prepositions correctly?

Yes. The Title Case converter follows standard style guide rules by keeping short words such as a, an, the, and, but, or, for, and in lowercase unless they appear as the first or last word of the title. This matches AP and Chicago style conventions.

Can I convert text that contains special characters or numbers?

The converter handles text with numbers, punctuation, and special characters without errors. Numbers and symbols remain in place while only the alphabetical characters are transformed to match your chosen case format.