camelCase writes compound words with the first word in lowercase and each subsequent word starting with a capital letter, with no spaces: getUserName, myVariableName. Named after the camel humps formed by the capitals. It is the standard naming convention for variables and functions in JavaScript, TypeScript, Java, and JSON keys.

What is snake_case and when is it used?

snake_case uses underscores to separate words with all characters lowercase: get_user_name. It is the standard convention in Python (variables, functions, module names), SQL (table and column names), Rust, Ruby, and C. SCREAMING_SNAKE_CASE (all caps with underscores) is used for constants in Python, Java, and C, and for environment variables.

kebab-case uses hyphens to separate words with all characters lowercase: get-user-name. It is the standard for CSS class names (.my-component), HTML data attributes (data-user-id), URL slugs (/blog/my-post-title), npm package names, and CLI flags (--output-file). It cannot be used in most programming language identifiers because hyphens are interpreted as subtraction operators.

How do I convert snake_case to camelCase online?

Paste your snake_case text into the input box and click the camelCase button. The converter automatically detects underscores, hyphens, spaces, and other word separators and rebuilds the text in the target case. For multiple identifiers, use the Batch Converter — paste one identifier per line.

What is SCREAMING_SNAKE_CASE?

SCREAMING_SNAKE_CASE (also called CONSTANT_CASE or MACRO_CASE) is an all-uppercase version of snake_case: MAX_RETRY_COUNT, API_BASE_URL, DATABASE_HOST. It is conventionally used for constants and immutable values in Python, Java, C, JavaScript, and environment variables in configuration files (.env).

What is a URL slug and how do I generate one?

A URL slug is a URL-safe version of a text string: lowercase, no special characters, spaces replaced with hyphens. For example 'My Blog Post Title!' becomes 'my-blog-post-title'. Use the slug-case option to generate slugs — it also handles accented characters (é→e, ü→u) for international text.

Can I convert multiple items at once?

Yes. Use the Batch Converter section — paste multiple items one per line (variable names, identifiers, titles) and select the target case. All items are converted simultaneously. This is particularly useful for renaming API response keys, converting a list of CSS properties, or reformatting exported data.

What naming convention should I use for CSS?

CSS class names and IDs conventionally use kebab-case (.nav-menu, #main-header). CSS custom properties (variables) also use kebab-case (--primary-color). When using CSS Modules or styled-components in JavaScript, camelCase is typically used to reference class names in JS code (styles.navMenu).

What naming convention does Python use?

Python's PEP 8 style guide specifies: snake_case for variables, functions, and module names; PascalCase (CapWords) for class names; SCREAMING_SNAKE_CASE for constants; and lowercase for package names (avoid underscores if possible). This is enforced by linters like pylint and flake8.

dot.case uses periods to separate words: app.config.database.host. It is used for configuration file keys in many frameworks (.env files, application.properties in Java, lodash path accessors), some logging systems, and language-specific conventions like Go package paths.

How do I handle accented characters when converting case?

Use the 'Remove accents' option under Clean operations to strip diacritical marks before converting (é→e, ü→u, ñ→n). The slug-case conversion does this automatically. Standard case conversions preserve accented characters as-is.

Home›Case Converter

Text Case Converter

Convert text between 30+ cases and formats — UPPER CASE, lower case, Title Case, camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE, dot.case, slug, and many more. Free, instant, nothing uploaded.

Your Text

9w · 43c · 1l

Choose a Conversion33 conversions

Standard

Developer

Fun

Clean

Lines

Wrap

All Conversions Preview

UPPER CASE

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG

lower case

the quick brown fox jumps over the lazy dog

Title Case

The Quick Brown Fox Jumps Over The Lazy Dog

Sentence case

The quick brown fox jumps over the lazy dog

tOGGLE cASE

tHE qUICK bROWN fOX jUMPS oVER tHE lAZY dOG

camelCase

theQuickBrownFoxJumpsOverTheLazyDog

PascalCase

TheQuickBrownFoxJumpsOverTheLazyDog

snake_case

the_quick_brown_fox_jumps_over_the_lazy_dog

SCREAMING_SNAKE

THE_QUICK_BROWN_FOX_JUMPS_OVER_THE_LAZY_DOG

kebab-case

the-quick-brown-fox-jumps-over-the-lazy-dog

Train-Case

The-Quick-Brown-Fox-Jumps-Over-The-Lazy-Dog

COBOL-CASE

THE-QUICK-BROWN-FOX-JUMPS-OVER-THE-LAZY-DOG

Free Online Text Case Converter — 30+ Formats

This free case converter transforms text between 30+ case formats and text operations instantly in your browser. From standard typographic cases like UPPER CASE and Title Case to developer-specific formats like camelCase, PascalCase, snake_case, kebab-case, and SCREAMING_SNAKE_CASE — plus text cleaning, line sorting, and wrapping utilities. Nothing is uploaded; everything runs locally.

All Conversion Types

UPPER CASE — ALL CAPS. Used for acronyms, headers, and CONSTANT values.
lower case — all lowercase. Used for URLs, email addresses, and CSS properties.
Title Case — Every Word Capitalized. Used for headings, titles, and UI labels.
Sentence case — First word of each sentence capitalized. Most readable for body text.
camelCase — No spaces, first word lowercase, rest capitalized. Standard for JavaScript, Java, and JSON keys.
PascalCase — Like camelCase but first word also capitalized. Standard for classes and React components.
snake_case — Words joined with underscores, all lowercase. Standard for Python, SQL, and Rust.
SCREAMING_SNAKE_CASE — Uppercase snake case. Used for constants and environment variables.
kebab-case — Words joined with hyphens, all lowercase. Standard for CSS classes, HTML attributes, and URLs.
slug-case — URL-safe slug with no special characters. Used for blog post URLs and routing.
dot.case and path/case — Used for configuration keys and file paths.
Batch conversion — Convert multiple items at once, one per line.

Who Uses a Case Converter?

Developers convert variable names between languages (Python snake_case to JavaScript camelCase, database column names to JSON keys). Front-end developers convert CSS class names to camelCase for styled-components or CSS Modules. Writers convert copied text to proper Title Case for article headings. SEO specialists create URL-safe slugs from titles. Developers rename API response keys when switching between snake_case backends and camelCase frontends.

Frequently Asked Questions

What is camelCase?

camelCase writes compound words with the first word in lowercase and subsequent words starting with a capital letter, with no spaces or separators. Examples: getUserName, myVariableName, fetchDataFromApi. Named after the "humps" that appear from the capital letters. Used in JavaScript, Java, TypeScript, and JSON.

What is the difference between camelCase and PascalCase?

Both join words without spaces and capitalize each word, but camelCase starts with a lowercase letter (myVariable) while PascalCase starts with an uppercase letter (MyVariable). PascalCase is also called UpperCamelCase. PascalCase is typically used for class names and constructors; camelCase for variables and functions.

What is snake_case used for?

snake_case uses underscores to separate words, all in lowercase. It is the standard naming convention in Python (variables, functions, modules), SQL (column and table names), Rust, and Ruby. SCREAMING_SNAKE_CASE (uppercase snake) is used for constants in Python, Java, C, and environment variables.

What is kebab-case?

kebab-case uses hyphens to separate words, all in lowercase. It is the standard for CSS class names, HTML data attributes, URL slugs, npm package names, and CLI flags. It cannot be used directly in most programming languages since hyphens are interpreted as minus signs.

How do I convert snake_case to camelCase?

Paste your snake_case text (or paste multiple identifiers, one per line) into the input box, then click camelCase. The converter handles any input format automatically — it detects separators like underscores, hyphens, and spaces, plus CamelCase word boundaries.

What is Title Case vs Sentence case?

Title Case capitalizes The First Letter Of Every Word — used for article headings, book titles, and page titles. Sentence case only capitalizes the first word of each sentence — more natural for body text, UI messages, and error messages.

Is my text sent to a server?

No. All conversions run entirely in your browser using JavaScript. Your text never leaves your device.