Text Case Types — Title Case, camelCase, snake_case & More Explained

Why Case Conventions Exist

Text case isn’t arbitrary. It carries information:

It tells readers and systems whether something is a proper noun, a variable, a function, a constant, or a URL slug
Different programming languages enforce different conventions (Python: snake_case, Java: camelCase, CSS: kebab-case)
Humans parse title-cased headings faster than all-caps ones at normal reading sizes

The Main Case Types

Sentence case

The quick brown fox jumps over the lazy dog.

Only the first word and proper nouns are capitalized. This is normal English prose. Most UI labels, app notifications, and informal writing use sentence case.

Used in: Body text, UI labels, email subjects, error messages, tooltips.

Title Case

The Quick Brown Fox Jumps Over the Lazy Dog

The first letter of each major word is capitalized. “Minor” words (prepositions, articles, conjunctions) are typically lowercase in the middle of a title.

Different style guides disagree on which words to lowercase:

AP Style: lowercase articles (a, an, the), coordinating conjunctions (and, but, or), and prepositions under 4 letters
Chicago Style: lowercase most prepositions regardless of length, plus articles and coordinating conjunctions
APA Style: capitalize all words of 4+ letters, even prepositions

Used in: Book titles, article headings, newspaper headlines, product names, film titles.

ALL CAPS (Uppercase)

THE QUICK BROWN FOX

All letters capitalized. Harder to read in long runs — all-caps words lose their shape, forcing letter-by-letter reading.

Used in: Abbreviations (NASA, HTTP, URL), acronyms, button labels for emphasis, legal documents, constants in some languages.

lowercase (all)

the quick brown fox

All lowercase, no exceptions.

Used in: URLs, email addresses, some brand names (e.g. adidas, reddit), CSS class names in some conventions.

camelCase

theQuickBrownFox

No spaces. The first word is all lowercase; each subsequent word starts with a capital letter. The capital letters in the middle resemble camel humps — hence the name.

Used in: JavaScript variables and functions, Java, Swift, Kotlin variable names.

PascalCase (UpperCamelCase)

TheQuickBrownFox

Same as camelCase but the very first letter is also capitalized.

Used in: Class names in most OOP languages (Python, Java, C#), React component names, TypeScript interfaces.

snake_case

the_quick_brown_fox

Words separated by underscores, all lowercase.

Used in: Python variables and functions, database column names, Ruby, file names in some conventions.

SCREAMING_SNAKE_CASE (UPPER_SNAKE_CASE)

THE_QUICK_BROWN_FOX

Like snake_case but all uppercase.

Used in: Constants and environment variables across many languages.

kebab-case (spinal-case)

the-quick-brown-fox

Words separated by hyphens, all lowercase. Named because it looks like items on a kebab skewer.

Used in: URLs (/learn/text-tools/text-case-types-explained), CSS class names, HTML attributes, npm package names, file names for web assets.

// JavaScript convention
const userFirstName = "Mahesh";
function calculateTotalPrice() { ... }

// React component
function UserProfileCard() { ... }

// TypeScript interface
interface LearnCategoryMeta { ... }

# Python convention
user_first_name = "Mahesh"
def calculate_total_price():
    pass

const MAX_RETRY_COUNT = 3;
const API_BASE_URL = "https://api.tools.town";

/* CSS convention */
.button-primary { ... }
.hero-section-title { ... }

Quick Comparison Table

Case Type	Example	Spaces	Caps	Common Use
Sentence case	Hello world	Yes	First word	Body text, UI
Title Case	Hello World	Yes	Most words	Headings, titles
ALL CAPS	HELLO WORLD	Yes	All	Acronyms, emphasis
camelCase	helloWorld	No	After first	JS variables
PascalCase	HelloWorld	No	Every word	Classes, components
snake_case	hello_world	_	None	Python, databases
UPPER_SNAKE	HELLO_WORLD	_	All	Constants, env vars
kebab-case	hello-world	-	None	URLs, CSS, HTML

Converting Between Cases

Converting manually is error-prone for long strings. A case converter handles:

1. Split into words

Split on spaces, underscores, hyphens, and capital-letter boundaries (for camelCase/PascalCase input).

→

2. Apply casing rule

For each word: capitalize first letter (TitleCase/PascalCase), lowercase all (snake/kebab), or uppercase all (UPPER_SNAKE).

→

3. Join with separator

Join words with space (Title Case), underscore (snake_case), hyphen (kebab-case), or nothing (camelCase/PascalCase).

Use our Case Converter to instantly transform any text into title case, sentence case, camelCase, PascalCase, snake_case, UPPER_SNAKE_CASE, or kebab-case — paste in and convert in one click.

Frequently Asked Questions

What is title case?

Title case capitalizes the first letter of most words. The exact rules vary by style guide, but minor words (a, an, the, and, or, but, in, on, at, etc.) are usually lowercase unless they start the title.

What is camelCase?

camelCase joins words together with no spaces, capitalizing the first letter of each word after the first. Example: myVariableName. It's widely used in JavaScript, Java, and Swift.

What is the difference between camelCase and PascalCase?

Both join words with capital letters. camelCase starts with a lowercase letter (myVariable). PascalCase starts with a capital letter (MyVariable). PascalCase is also called UpperCamelCase.

What is snake_case?

snake_case replaces spaces with underscores and uses all lowercase letters. It is the dominant convention in Python variable names and database column names.

AI Text Summarizer

Go Premium

Text Case Types Explained — Title Case, Sentence Case, camelCase & More

Key Takeaways