How do I convert camelCase to snake_case?

Paste the camelCase text into the input, then click snake_case in the format list. The tool detects the camelCase word boundaries automatically and joins them with underscores, so `userFirstName` becomes `user_first_name` — no manual splitting needed.

What's the difference between camelCase and PascalCase?

Both join words with no spaces or punctuation. camelCase keeps the first word lowercase (`myVariable`), while PascalCase capitalizes it (`MyClass`). Use camelCase for variables and functions, PascalCase for classes and components.

How do I convert a sentence to Title Case?

Select Title Case from the format list — the first letter of every word gets capitalized. It applies to all words without skipping short prepositions or articles, so for strict editorial title case, manual review is still needed.

Can I convert multiple lines of text at once?

Yes. Line breaks are preserved in UPPERCASE, lowercase, Sentence case, and Title Case. In programmatic formats like camelCase or snake_case, each line is converted independently.

What happens to numbers and special characters during conversion?

Numbers are kept as-is in every format. Special characters are stripped in programmatic formats since identifiers can't contain them, but they're preserved in UPPERCASE, lowercase, Sentence case, and Title Case.

Case Converter

Convert text to UPPER CASE, lower case, camelCase, PascalCase, snake_case, kebab-case and more — instantly in your browser.

Updated March 2026

Input Text

0 characters

Shift + Enter to Copy · Shift + ← → for formats

Converted Result

words

characters

Format

Sentence case

How to Convert Text Case

Convert to any format in one click

1. Paste or type your text

Into the input box — works with multiple lines.

2. Click a format

UPPERCASE, camelCase, snake_case, or any of the 10 supported case styles.

3. Copy the result

Click Copy or press `Shift+Enter`. Use `Shift+←/→` to cycle through formats without the mouse.

What This Case Converter Does

10 case styles, automatic input detection

camelCase and PascalCase

Standard in JavaScript, TypeScript, Java, and C# — variables/functions vs. classes/components.

snake_case and CONSTANT_CASE

Convention in Python, Ruby, and databases; CONSTANT_CASE for environment variables.

kebab-case

Standard for HTML attributes, CSS classes, URL slugs, and command-line flags.

dot.case

Config keys, Java packages, and logging frameworks.

Automatic detection

helloWorld is already recognized as camelCase — no need to split words manually first.

100% in your browser

No text is ever sent to a server during conversion.

Examples

Input

Format → Output

user_first_name

camelCase → userFirstName

How To Use React Hooks

kebab-case → how-to-use-react-hooks

database connection string

CONSTANT_CASE → DATABASE_CONNECTION_STRING

helloWorld

snake_case → hello_world

When You'll Need This

The most common scenarios among people who use this tool

Renaming variables across languages

Porting Python to JavaScript: convert user_first_name to userFirstName in bulk.

Generating URL slugs

Convert a post title to kebab-case for a clean, readable URL.

Creating environment variables

Turn plain descriptions into ready-to-use CONSTANT_CASE for .env files or a secrets manager.

Fixing capitalization in documents

Text typed in ALL CAPS by mistake, or applying Title Case consistently across headings.

Common Mistakes

Confusing camelCase with PascalCase

The only difference is the first letter: lowercase in camelCase, uppercase in PascalCase.

Expecting editorial rules from Title Case

It capitalizes every word without skipping short prepositions — manual review is still needed for strict style-guide title case.

Expecting special characters in programmatic formats

!, @, # are stripped when converting to camelCase or snake_case, since identifiers can't contain them.

Why Use This Case Converter

It automatically detects and splits input that's already in camelCase, PascalCase, snake_case, kebab-case, or dot.case before converting — no need to separate the words manually first.

10 formats cover nearly every programming ecosystem, running entirely in your browser with no code ever sent to a server.

Frequently Asked Questions

Yes. It automatically detects and splits input written in camelCase, PascalCase, snake_case, kebab-case, and dot.case into individual words before applying the target format.

References

Wikipedia — Naming Convention (Programming)

A comprehensive overview of every case style used across programming languages and ecosystems.

Google Developer Documentation Style Guide

Google's official guidance on naming conventions and word choice for technical documentation.

PEP 8 — Python Naming Conventions

The official Python style guide, covering snake_case for functions and variables, and CONSTANT_CASE for constants.