Free Online Text Case Converter

Case Converter
Online

The fastest way to convert text between UPPERCASE, lowercase, camelCase, snake_case, Title Case, and 7 more formats instantly, privately, right in your browser.

case-conv text converter
Characters: 0 Words: 0 Sentences: 0 Lines: 0
Quick Guide

How to Use Case Converter

No tutorials. No account. Just paste, click, and copy.

01

Enter Your Text

Type or paste any text a single word, a paragraph, or thousands of lines directly into the editor. A live counter tracks your characters, words, sentences, and lines as you go.

Live statistics as you type
02

Pick a Case Format

Click any of the 12 case format buttons UPPERCASE, camelCase, snake_case, and more. Your text converts instantly inside the same box. Need to convert only part of the text? Highlight a selection first, then click.

12 formats · select text to convert partially
03

Copy or Download

Hit Copy Result to send the converted text straight to your clipboard, or use Download to save it as a .txt file. Switch formats as many times as you need your original text stays editable throughout.

One-click copy or download
Try It Now It's Free No account needed · Works in every browser · Your text never leaves your device
Reference

All 12 Supported Case Formats

Every programming language, writing standard, and platform has its own casing convention. Below is a definitive reference guide to all twelve text case formats supported by Case Converter with examples and real world use cases for each.

UPPERCASE
HELLO WORLD
Every character is capitalised. Used for acronyms, warning labels, section headers in legal documents, and strong emphasis in marketing copy.
lowercase
hello world
Every character is made small. The go-to format for URLs, email addresses, HTML tag attributes, CSS selectors, and database field names.
Title Case
Hello World
The first letter of each word is capitalised. Required by APA, MLA, and Chicago style guides for article headlines, book titles, and page headings.
Sentence case
Hello world.
Only the first word is capitalised, just like a normal sentence. Best for UI notifications, error messages, tooltip text, and body paragraph copy.
camelCase
helloWorld
Words are merged; every word after the first starts with a capital. The naming standard for variables and functions in JavaScript, Java, Swift, and Kotlin.
PascalCase
HelloWorld
Like camelCase but the very first word is also capitalised. The standard for class names, React components, TypeScript interfaces, and C# methods.
snake_case
hello_world
Words joined by underscores, all lowercase. The dominant naming convention in Python, Ruby on Rails, PostgreSQL column names, and REST API parameters.
kebab-case
hello-world
Words joined by hyphens, all lowercase. Used in URL slugs, HTML element IDs, CSS class names, npm package names, and command-line flags.
CONSTANT_CASE
HELLO_WORLD
All caps with underscore separators. The universal convention for environment variables, compile-time constants, and configuration macros across all languages.
dot.case
hello.world
Words separated by dots in lowercase. Standard in Java and Kotlin package namespaces, Spring Boot config keys, and structured logging identifiers.
aLtErNaTiNg
hElLo WoRlD
Every other character alternates between lower and upper case. A playful stylistic format popularised in internet meme culture and sarcastic social media commentary.
iNVERSE cASE
hELLO wORLD
Every character's case is flipped capitals become lowercase and vice versa. Useful for correcting text typed with Caps Lock accidentally left on.
Who It's For

Who Uses a Case Converter?

Inconsistent text casing costs more time than most people realise. Case Converter is built for anyone who works with text professionally and needs it formatted correctly the first time.

👩‍💻
Developers
Instantly reformat variable names, function identifiers, and API keys between camelCase, snake_case, PascalCase, and kebab-case to match any language convention.
✍️
Content Writers
Correct pasted text that arrives in the wrong case, apply consistent Title Case to headlines, or normalise copy pulled from different sources in seconds.
🎨
Designers
Prototype UI labels, navigation text, and button copy in the exact case required by the design system without manually retyping every word.
📊
Data Analysts
Standardise column headers, category labels, and dataset fields to a consistent casing format before loading into spreadsheets, SQL tables, or BI tools.
🔍
SEO Specialists
Format page titles, URL slugs, meta descriptions, and schema markup fields consistently to align with search engine guidelines and on page SEO best practices.
📚
Students
Format essay titles, bibliography entries, and research headings to match APA, MLA, or Chicago style requirements without second-guessing capitalization rules.
📣
Marketers
Keep ad copy, campaign slugs, email subject lines, and social media posts casing-consistent to project a professional and trustworthy brand identity.
🌐
Translators
Reformat localised strings and translated UI text to match the casing conventions of the target language, platform, or software style guide.

Why Case Converter?

Most online text tools are slow, ad heavy, or force you to jump between an input box and a separate output area. Case Converter takes a different approach your text converts inside the same box the moment you click a format, with zero page reloads and zero distractions.

Every conversion runs entirely inside your browser using JavaScript. Nothing is sent to a server, nothing is logged, and nothing is stored. That makes Case Converter safe for sensitive content source code, internal documents, client data, or anything else you'd rather keep off the internet.

With 12 case formats, real time text statistics, partial selection conversion, and built in cleanup options like removing extra spaces and normalising line breaks, Case Converter is the only text casing tool you'll ever need. It works on desktop, tablet, and mobile with no installation, no account, and no cost ever.

FAQ

Frequently Asked Questions

Is Case Converter completely free to use?
Yes 100% free, forever. There are no premium plans, no usage limits, no sign up walls, and no hidden fees. All 12 case conversion formats are available to every visitor from the moment they land on the page.
Does Case Converter store or transmit my text?
No. Every conversion happens locally in your browser using JavaScript your text never leaves your device and is never sent to any server. There are no cookies tracking what you type and no analytics logging your input. It is completely safe to use with confidential or proprietary text.
What is the difference between camelCase and PascalCase?
Both formats join words without spaces, but they differ in how the first word is treated. In camelCase, the first word is entirely lowercase for example, helloWorld. In PascalCase, the first word also starts with a capital, for example, HelloWorld. Developers typically use camelCase for variables and function names, and PascalCase for class names, components, and constructors.
Can I convert only part of my text without affecting the rest?
Yes. Simply highlight the specific words or characters you want to convert inside the text box, then click any case format button. Only the selected portion will be transformed everything else stays exactly as it was. This makes it easy to reformat a single variable name or headline within a larger block of text.
How does Sentence case differ from Title Case?
Sentence case capitalises only the very first character of the text, treating everything else as lowercase exactly like a normal written sentence. Title Case capitalises the first letter of every individual word. Use Sentence case for UI copy, tooltips, and body text; use Title Case for article headlines, product names, and formal document headings.
Is there a limit on how much text I can convert?
There is no imposed limit. Because all processing happens directly in your browser, there is no server side restriction on text length. Pasting an entire document with thousands of words will convert in milliseconds on any modern device.
When would I use dot.case?
dot.case is the preferred convention wherever dots are valid word separators. Common examples include Java and Kotlin package names such as com.example.app, Spring Boot application property keys like server.port, and namespace identifiers in structured logging frameworks. It is rarely used in everyday writing but is a standard in several back-end ecosystems.
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Join thousands of developers, writers, and designers who use Case Converter every day. Free, instant, and completely private.

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