Case Converter Online Free - camelCase, snake_case, kebab-case

Instantly convert text between camelCase, snake_case, kebab-case, PascalCase, and 10+ other formats. Free, fast, and no signup required.

→ Try Our Free Case Converter Now

---

What is Case Conversion?

Case conversion transforms text from one naming convention to another. Different programming languages, frameworks, and style guides prefer different casing styles.

Our Case Converter instantly transforms your text between all major casing formats.

Common Case Formats

| Format | Example | Common Use | |--------|---------|------------| | camelCase | myVariableName | JavaScript variables, Java fields | | PascalCase | MyClassName | Class names, TypeScript types | | snake_case | my_variable_name | Python variables, database columns | | kebab-case | my-variable-name | CSS classes, URL slugs, HTML attributes | | UPPER_SNAKE_CASE | MY_CONSTANT | Constants, environment variables | | lowercase | myvariablename | URLs, file names | | UPPERCASE | MYVARIABLENAME | Acronyms, emphasis |

Why Case Matters

Different contexts have different conventions:

// JavaScript
const userName = "Alice";        // camelCase for variables
class UserProfile { }            // PascalCase for classes
Python
user_name = "Alice"              # snake_case for variables
class UserProfile: pass          # PascalCase for classes
// CSS
.user-profile-container { }      // kebab-case for classes
// Database
CREATE TABLE user_profiles (     // snake_case for columns
    user_id INT,
    first_name VARCHAR(50)
);

---

Why You Need a Case Converter

Common Use Cases

| Scenario | Problem | Solution | |----------|---------|----------| | Code Refactoring | Migrating Python to JavaScript | Convert snake_case to camelCase | | API Integration | REST API expects camelCase, DB has snake_case | Batch convert field names | | CSS Class Naming | Convert component names to kebab-case | Generate CSS-ready class names | | Database Schema | Generate SQL from code variables | Convert camelCase to snake_case | | URL Generation | Create SEO-friendly URLs | Convert titles to kebab-case | | Constant Definition | Create environment variable names | Convert to UPPER_SNAKE_CASE |

Real-World Examples

Example 1: API Response Transformation

Database: user_first_name, user_last_name
API needs: userFirstName, userLastName
Input:  user_first_name, user_last_name
Output: userFirstName, userLastName

Example 2: CSS Class Generation

Component: User Profile Card
CSS class: user-profile-card
Input:  User Profile Card
Output: user-profile-card

Example 3: Environment Variables

Config key: database host
Env var: DATABASE_HOST
Input:  database host
Output: DATABASE_HOST

---

How to Use Our Case Converter

Step 1: Enter Your Text

Paste any text into the input field:

Hello World Example

Step 2: Choose Output Format

Select from 12+ conversion options:

• camelCase
• PascalCase
• snake_case
• kebab-case
• UPPER_SNAKE_CASE
• lowercase
• UPPERCASE
• Title Case
• Sentence case
• Alternating Case
• Reverse Case
• Custom delimiter

Step 3: Get Instant Results

Input:

Hello World Example

All formats at once:

camelCase:          helloWorldExample
PascalCase:         HelloWorldExample
snake_case:         hello_world_example
kebab-case:         hello-world-example
UPPER_SNAKE_CASE:   HELLO_WORLD_EXAMPLE
lowercase:          helloworldexample
UPPERCASE:          HELLOWORLDEXAMPLE
Title Case:         Hello World Example
Sentence case:      Hello world example

Step 4: Copy and Use

• Copy individual format — Click to copy any format
• Copy all formats — Export all conversions at once
• Download as file — Save results for later use

---

Features

Core Features

• 12+ Case Formats — All major naming conventions supported.
• Batch Conversion — Convert multiple lines at once.
• Auto-Detect Input — Automatically detects input format.
• Real-Time Preview — Results update as you type.
• Preserve Acronyms — Smart handling of HTTP, API, URL, etc.
• Multi-Language Support — Works with Unicode characters.

Advanced Features

• Custom Delimiters — Define your own separator character.
• Prefix/Suffix — Add prefixes or suffixes to output.
• Exclude Words — Skip articles, prepositions in transformations.
• Regex Mode — Advanced pattern matching for complex conversions.
• History — Last 20 conversions (stored locally).

Developer Experience

• Keyboard Shortcuts — Ctrl+Enter to convert, Ctrl+Shift+C to copy.
• API Access — Pro feature: programmatic case conversion.
• VS Code Extension — Convert directly in your editor (Pro).
• CLI Tool — Command-line case converter for scripts (Pro).

Privacy

• Client-Side Only — Text never leaves your browser.
• No Storage — Nothing is saved or logged.
• No Signup — Use anonymously, forever free.

---

Case Format Guide

camelCase

Structure: First word lowercase, subsequent words capitalized.

const firstName = "Alice";
const totalItemCount = 42;
function getUserById() { }

Best for: JavaScript variables, Java fields, C# variables

PascalCase (UpperCamelCase)

Structure: All words capitalized.

class UserProfile { }
interface ApiResponse { }
type UserConfig = { }

Best for: Class names, TypeScript types, C# classes

snake_case

Structure: All lowercase, words separated by underscores.

user_name = "Alice"
total_item_count = 42
def get_user_by_id(): pass

Best for: Python variables, Ruby methods, database columns

kebab-case (spinal-case)

Structure: All lowercase, words separated by hyphens.

.user-profile-container { }
.api-response-handler { }

...

Best for: CSS classes, HTML attributes, URL slugs, file names

UPPER_SNAKE_CASE (SCREAMING_SNAKE_CASE)

Structure: All uppercase, words separated by underscores.

const MAX_RETRY_COUNT = 3;
const API_KEY = "secret123";
process.env.DATABASE_URL;

Best for: Constants, environment variables, configuration keys

---

Best Practices

1. Follow Language Conventions

✅ JavaScript: camelCase variables, PascalCase classes
✅ Python: snake_case variables, PascalCase classes
✅ CSS: kebab-case classes
✅ SQL: snake_case columns
✅ URLs: kebab-case slugs

2. Be Consistent Within Projects

// Bad: Mixed conventions
const userName = "Alice";
const user_age = 30;
const UserEmail = "[email protected]";
// Good: Consistent camelCase
const userName = "Alice";
const userAge = 30;
const userEmail = "[email protected]";

3. Handle Acronyms Intelligently

// Preferred
parseXML()      // not ParseXml
getHTTPClient() // not GetHttpClient
xmlParser       // not XMLParser
// Follow your style guide

4. Avoid Ambiguous Conversions

Input:  "iPhone"
camelCase:  iPhone     ✓
snake_case: i_phone    ⚠️ (loses capitalization hint)
kebab-case: i-phone    ⚠️ (loses capitalization hint)
Consider: iphone, i-phone, or keep as-is

---

Related Tools

Working with text and code? Check these out:

• Slug Generator — Create SEO-friendly URLs
• JSON Formatter — Format code output
• Text Counter — Count words and characters
• Base64 Encoder — Encode text data

---

Frequently Asked Questions

Q: What's the difference between camelCase and PascalCase?

A: camelCase starts with lowercase (myVariable), while PascalCase starts with uppercase (MyVariable). PascalCase is also called UpperCamelCase.

Q: Can I convert an entire file?

A: Yes, paste your entire file content. For large files (1000+ lines), consider our Pro version with batch file processing.

Q: Does this preserve numbers?

A: Yes! Numbers are preserved during conversion: user123Name → user_123_name (snake_case).

Q: Can I convert from any format to any format?

A: Yes! Our auto-detect identifies your input format and converts to any selected output format.

Q: Is there an API for programmatic conversion?

A: Yes, our Pro plan includes API access for integrating case conversion into your workflows.

---

Try More Free Tools

Transform your code? Explore 82+ free developer tools at DevKits:

• Slug Generator
• JSON Formatter
• CSV to JSON Converter
• Text Counter
• Base64 Encoder/Decoder
• Case Converter (this tool!)
• Hash Generator
• And 74 more...

Pro Tip: Our Pro plan includes VS Code extension, CLI tool, and API access for automated case conversion in your CI/CD pipeline.

---

Ready to convert your code? Try DevKits Case Converter — free, fast, and no signup required.

---

Last updated: March 11, 2026