Text Case Converter — Complete Guide to Changing Text Case 2026

A text case converter transforms text between different capitalization formats. Whether you need UPPERCASE for emphasis, camelCase for coding, or Title Case for headings, this guide covers all 10+ text case formats.

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10 Types of Text Case

1. UPPERCASE (All Caps)

Input:  hello world
Output: HELLO WORLD

Every letter is capitalized. Used for emphasis, acronyms, and warnings.

2. lowercase (All Lower)

Input:  HELLO WORLD
Output: hello world

All letters are lowercase. Common in URLs and email addresses.

3. Title Case (Capitalized)

Input:  hello world
Output: Hello World

First letter of each word is capitalized. Used for titles and headings.

4. Sentence case

Input:  HELLO WORLD. HOW ARE YOU?
Output: Hello world. How are you?

Only the first letter of each sentence is capitalized.

5. camelCase (Lower Camel)

Input:  hello world example
Output: helloWorldExample

First word lowercase, subsequent words capitalized. No spaces.

6. PascalCase (Upper Camel)

Input:  hello world example
Output: HelloWorldExample

Like camelCase, but first letter also capitalized.

7. snake_case

Input:  hello world example
Output: hello_world_example

Words separated by underscores, all lowercase.

8. SCREAMING_SNAKE_CASE

Input:  hello world example
Output: HELLO_WORLD_EXAMPLE

Like snake_case, but all uppercase. Used for constants.

9. kebab-case (spinal-case)

Input:  hello world example
Output: hello-world-example

Words separated by hyphens, all lowercase. Used in URLs.

10. CONSTANT_CASE

Input:  database connection timeout
Output: DATABASE_CONNECTION_TIMEOUT

Same as SCREAMING_SNAKE_CASE. Used for constants in code.

When to Use Each Case Type

Case Type	Common Uses
UPPERCASE	Warnings, acronyms (NASA, FBI), emphasis
lowercase	URLs, email addresses, Unix commands
Title Case	Book titles, article headlines, proper nouns
Sentence case	Body text, descriptions, comments
camelCase	JavaScript variables, Java methods, JSON keys
PascalCase	Classes, interfaces, TypeScript types
snake_case	Python variables, Ruby methods, database columns
SCREAMING_SNAKE	Constants, environment variables
kebab-case	URLs, CSS classes, HTML attributes

Programming Case Conventions

JavaScript / TypeScript

// Variables and functions: camelCase
const userName = "john";
function getUserData() { }

// Classes: PascalCase
class UserProfile { }

// Constants: SCREAMING_SNAKE_CASE
const MAX_RETRIES = 5;

// Files: PascalCase or camelCase
UserProfile.ts
userController.ts

Python

# Variables and functions: snake_case
user_name = "john"
def get_user_data():
    pass

# Classes: PascalCase
class UserProfile:
    pass

# Constants: UPPER_SNAKE_CASE
MAX_RETRIES = 5

Ruby

# Variables and methods: snake_case
user_name = "john"
def get_user_data
end

# Classes and modules: PascalCase
class UserProfile
end

CSS

/* Classes: kebab-case */
.user-profile { }
.nav-bar { }
.btn-primary { }

/* BEM notation */
.block__element--modifier { }

Tips for Case Conversion

Handling Edge Cases

Input:  "Hello-world's FRIENDS"
camelCase:    "helloWorldSFriends"
snake_case:   "hello_world_s_friends"
kebab-case:   "hello-world-s-friends"
Title Case:   "Hello-World's Friends"

Preserving Acronyms

Input:  "convert XML to JSON"
camelCase:    "convertXmlToJson"  (not "convertXmLToJson")
snake_case:   "convert_xml_to_json"

Special Characters

Most converters strip or replace special characters:

Input:  "hello@world#test"
snake_case: "hello_world_test"

Best Case Converter Tools

1. DevKits Text Case Converter

Best for: All-in-one case conversion

• 10+ case formats supported
• Real-time preview
• Bulk conversion
• Privacy-focused (client-side)

Try DevKits Text Case Converter →

2. ConvertCase.net

Best for: Simple online conversion

3. VS Code Extensions

Best for: In-editor conversion

• Change Case extension
• Text Transform

Frequently Asked Questions

What's the difference between camelCase and PascalCase?

camelCase starts lowercase (myVariable), PascalCase starts uppercase (MyVariable). Both capitalize subsequent words.

When should I use snake_case vs camelCase?

Follow your language's convention: Python/Ruby use snake_case, JavaScript/Java use camelCase.

Is kebab-case the same as spinal-case?

Yes, they're the same thing. "Kebab-case" is more common; "spinal-case" is occasionally used.

Can I convert case in bulk?

Yes, DevKits supports bulk conversion of multiple lines at once.

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Last updated: March 10, 2026