Free Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case and 6 more formats — all in one click.
Instant Convert
100% Private
13 Case Types
Works on Mobile
Your Text
Nothing leaves your browser
0 chars · 0 words
Choose a Case
Output
Characters
0
Words
0
Case
—
Tip: Click any case button to transform your text instantly. The result appears in the Output box below, ready to copy.
What Is a Case Converter?
A case converter is a tool that changes the letter case of text without retyping it. Instead of manually capitalizing each word or converting text to lowercase letter by letter, you click a button and the whole block transforms instantly.
Case converters are used by writers, editors, developers, students and anyone who needs to reformat text — from making headings Title Case to converting variable names into camelCase for code.
All 13 case types explained
| Case Type | Example | Best Used For |
|---|---|---|
| UPPERCASE | HELLO WORLD | Headings, acronyms, emphasis |
| lowercase | hello world | Social media, informal text, hashtags |
| Title Case | Hello World | Book titles, headlines, subtitles |
| Sentence case | Hello world | Body text, email subject lines |
| Capitalized Case | Hello World | Similar to Title Case (all words) |
| camelCase | helloWorld | JavaScript variables, React props |
| PascalCase | HelloWorld | C# classes, Java classes, React components |
| snake_case | hello_world | Python variables, database columns, SQL |
| kebab-case | hello-world | URLs, CSS classes, file names |
| CONSTANT_CASE | HELLO_WORLD | Constants in most languages |
| dot.case | hello.world | Object property paths, namespaces |
| aLtErNaTiNg | hElLo WoRlD | Memes, mocking tone, jokes |
| iNVERSE cASE | hELLO wORLD | Text swaps, puzzles |
When to use each case
For writing and publishing
- Title Case — book titles, article headlines, movie titles, song titles. Chicago Manual of Style and most US publications use Title Case.
- Sentence case — most web content, blog posts, email subject lines, body paragraphs. Modern style guides (Google, Microsoft) prefer Sentence case for headings.
- UPPERCASE — short emphasis, acronyms (NASA, PDF), warning labels, buttons that need to pop.
- lowercase — informal tone, social bios, all-lowercase brand voices (like teen-focused brands).
For programming
- camelCase — JavaScript and TypeScript variables/functions, Java methods. Example:
getUserById. - PascalCase — classes and interfaces in most languages, React components. Example:
UserProfile. - snake_case — Python variables/functions, database columns, Ruby. Example:
user_profile. - CONSTANT_CASE — constants in JavaScript, Python, C, Java. Example:
MAX_RETRY_COUNT. - kebab-case — URLs, CSS class names, HTML attributes. Example:
user-profile-card. - dot.case — object paths, namespaces, Java packages. Example:
com.example.app.
Title Case vs Sentence Case: the eternal debate
Both are correct — it depends on the style guide you follow:
- Title Case (Chicago Manual of Style, APA) — capitalizes the first letter of every major word. Prepositions, articles and conjunctions stay lowercase unless they are the first or last word. Example: To Kill a Mockingbird.
- Sentence case (AP Style, most modern web style guides) — capitalizes only the first word and proper nouns. Example: How to make a cup of coffee.
In 2026, Sentence case is winning on the web because it reads more naturally and is easier to scan. Google, Microsoft, Apple and most modern SaaS products use Sentence case for UI text and headings.
How case affects SEO
- Meta titles and descriptions — Google normalizes case, so UPPERCASE vs Title Case doesn't affect indexing. But ALL CAPS titles get lower CTR and may even be flagged as spammy in some contexts.
- URLs — URLs are case-sensitive on many servers.
/Aboutand/aboutcan be different pages. Always use lowercase for URLs. - Keywords — Search is case-insensitive, so "PDF converter" and "pdf converter" return the same results.
- Anchor text — Capitalization in anchor text doesn't matter for SEO, but consistent case looks more professional.
Common use cases
- Writers — convert all-caps text to readable Sentence case.
- Editors — apply consistent Title Case to headings.
- Developers — convert variable names between camelCase, snake_case and kebab-case.
- Students — format essay titles in Title Case.
- Social media managers — lowercase brand voice, or properly capitalized announcements.
- Bloggers — fix accidental Caps Lock text.
- Anyone — recover from accidentally typing with Caps Lock on.
Privacy and security
This case converter runs entirely in your browser. Your text is never sent to any server, never stored anywhere, and disappears the moment you close the tab. Safe for confidential documents, unreleased content and private client work.
Frequently Asked Questions
What is a case converter?
A case converter is a tool that changes the letter case of text. It can turn text into UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and other programming-friendly formats.
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every major word (The Quick Brown Fox). Sentence case only capitalizes the first word of each sentence and proper nouns (The quick brown fox). Title Case is used for headlines and book titles; Sentence case is standard for body text.
What is camelCase?
camelCase starts with a lowercase letter and capitalizes the first letter of each subsequent word, with no separators. Example:
myVariableName. It's a common naming convention in JavaScript, Java and other programming languages.What is snake_case and kebab-case?
snake_case uses underscores between words (
my_variable_name) and is common in Python and databases. kebab-case uses hyphens (my-variable-name) and is standard for URLs, CSS class names and file names.How does alternating case work?
Alternating case (also called 'sponge case' or 'studly caps') alternates between uppercase and lowercase letters throughout the text. Example:
tHiS iS aLtErNaTiNg CaSe. It's often used humorously to mock or emphasize content.Does capitalization affect SEO?
Google's search is case-insensitive, so capitalization does not affect whether your page ranks. However, ALL CAPS titles get lower CTR and may look spammy. Best practice is Sentence case for meta titles and lowercase for URL slugs.
Is this case converter free?
Yes. It is 100% free, requires no sign-up, and runs entirely in your browser. Your text never leaves your device.