🔤 Text Case Converter ☆

Overview

Our Free Case Converter is a free online text transformation utility that instantly converts your text between multiple case formats. Format text for programming (camelCase, PascalCase, snake_case, kebab-case), for writing (UPPERCASE, lowercase, Title Case, Sentence case) or for styling (aLtErNaTiNg case, Capitalized Words), all with a single click. Simply paste your text, select the desired case format, and the converted result appears immediately. The tool preserves numbers, punctuation, and special characters while transforming letter cases according to your chosen format. Developers use it daily for renaming variables and generating URL slugs. Writers use it for formatting headlines and correcting accidental caps lock. Marketers use it for creating consistent social media captions. All processing happens entirely in your browser. Your text never leaves your device. Perfect for programmers, content creators, students, and anyone who works with text formatting. No downloads, no sign-up, no data collection. Just instant case conversion on any device.

How the case converter works

The converter tokenizes your text into words, applies the rules of the target format and joins them back: camelCase and PascalCase capitalize word boundaries for code, snake_case and kebab-case replace spaces with separators for identifiers and URL slugs, Title Case and Sentence case follow editorial rules, and alternating case flips each character. Punctuation and numbers are preserved, and accented letters are handled correctly so "café" becomes "Café", not a broken byte sequence. Everything updates as you paste.

How it works and what it supports

Property	Text case converter behavior
Code formats	camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE
Editorial formats	UPPERCASE, lowercase, Title Case, Sentence case
Styling	aLtErNaTiNg case, Capitalized Words
Unicode	Accents, emoji and non-Latin scripts preserved
Processing	100% client-side; text never uploaded
Cost	Free, no account, no ads, no character limit

Privacy: drafts stay in the browser

Copy often contains client names, unpublished content or internal identifiers. Conversion runs locally: nothing is transmitted, stored or logged, and the page works offline after loading.

Case conversion tips

• Use kebab-case for URL slugs and snake_case for database columns.
• Check acronyms after camelCase conversion: "userID" rules vary by language.
• Do not uppercase CSS selectors that must match class names exactly.
• Verify Title Case against your style guide, rules differ for small words.
• Trim trailing spaces before converting to avoid double separators.

Related: browse the text tools for counters, diffs, Markdown and fancy text.

Case styles used in code and editorial work

Programming and publishing each have their own naming conventions, and converting between them is a daily task when refactoring code, renaming files or cleaning up imported data. camelCase starts lowercase and capitalises each following word; it is standard for variables and functions in Java and JavaScript. PascalCase capitalises every word and names classes, types and React components. snake_case joins words with underscores and dominates Python, Ruby and database columns. kebab-case uses hyphens and is the convention for CSS class names, package names and URL slugs, where spaces are invalid and underscores can be read as invisible. CONSTANT_CASE is snake_case in capitals and marks values that never change. Title Case and sentence case are editorial styles: the first capitalises major words and suits headlines, while the second capitalises only the first word and is easier to read in long text. Two pitfalls are worth knowing. Acronyms need a decision, API, URL and ID are usually kept uppercase in snake case but treated as words in camel case, giving apiUrl rather than aPIURL. And case conversion cannot recover word boundaries that were never marked: an all-lowercase string such as myfile name must be split by a separator or by a dictionary, so provide the original casing where you can. The conversion happens in the browser, so code and content never leave your machine.