What is text "case" in programming?
In programming, case (or casing) is the convention for how the
words in an identifier — a variable, function, class, file or constant name — are joined
and capitalized. Every language and every context has its own conventions, and converting
between them by hand is tedious and error-prone. This tool converts to
all formats at once, live, as you type.
Supported formats
- camelCase — first word lowercase, remaining words capitalized, no separator (e.g.:
userName). Common in JavaScript, Java and C# variables and functions.
- PascalCase — every word capitalized, no separator (e.g.:
UserName). Used for class and component names.
- snake_case — lowercase words joined by an underscore (e.g.:
user_name). Common in Python, Ruby and database column names.
- kebab-case — lowercase words joined by a hyphen (e.g.:
user-name). Used in URLs, file names and CSS classes.
- CONSTANT_CASE — uppercase words joined by an underscore (e.g.:
USER_NAME). Standard for constants and environment variables.
- Title Case — capitalized words separated by a space (e.g.:
User Name). Useful for titles and readable labels.
How the conversion works
The tool first splits the text into words, recognizing both common
separators (space, _, -, ., among others)
and the upper/lowercase boundaries of a text that is already in camelCase or
PascalCase. It then rebuilds those words in the format of each output. So you can
paste myTestVariable and get my_test_variable right away.
Frequently Asked Questions (FAQ)
Why show all formats at once?
Because in most cases you don't know beforehand which format you'll need — or you need
more than one. Seeing all of them at once, updated live, is faster than picking one
format at a time. Each row has its own copy button.
How are accents and special characters handled?
Non-alphanumeric characters are treated as word separators. Accented letters
are preserved within words, with only the case (upper/lower) adjusted
according to the target format.
Are numbers preserved?
Yes. Digits remain part of the words. For example, user 2 test
becomes user2Test in camelCase, keeping the number in place.