無料大文字・小文字変換ソフト - UPPER, lower & more
Convert text between UPPER, lower, Title, camelCase, snake_case, and more.
Choose Case
About Text Case Conversion
Text case conversion is the process of changing the capitalization style of text. Different contexts require different casing conventions. Title Case is standard for headings and book titles. camelCase and PascalCase are used extensively in programming for variable and class names. snake_case is common in Python and database column names. kebab-case is the standard for CSS class names and URL slugs.
This tool converts between 11 different case styles instantly as you type. All processing happens locally in your browser · nothing is sent to any server.
Common Uses
- Convert variable names between programming conventions
- Fix accidentally typed CAPS LOCK text
- Generate URL-friendly slugs with kebab-case
- Standardize headings and titles to Title Case
- Create database column names in snake_case
- Convert CSS class names to the right format
Frequently Asked Questions
What is the difference between camelCase and PascalCase?
camelCase starts with a lowercase letter and capitalizes each subsequent word (e.g., "myVariableName"). PascalCase capitalizes every word including the first (e.g., "MyVariableName"). camelCase is typical for JavaScript variables and functions, while PascalCase is used for class names in most languages.
What is CONSTANT_CASE used for?
CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) uses all uppercase letters with underscores between words. It is the standard convention for constants and environment variables in most programming languages (e.g., MAX_RETRIES, API_BASE_URL).
Does this tool handle special characters?
Yes. Non-alphabetic characters (numbers, punctuation, symbols) are preserved as-is in most modes. For programmer modes like camelCase and snake_case, spaces and separators are used to identify word boundaries.