Hack the Hydra
Text styles
UPPERCASE and lowercase change every letter. Title Case capitalizes the first letter of each word; Sentence case capitalizes only the first letter of each sentence and leaves the rest lowercase. Note that these are mechanical rules: Title Case here does not keep small words such as "of" or "and" lowercase, as some style guides require, so check headlines by hand.
Programming identifiers
camelCase and PascalCase join words with no separator, snake_case uses underscores, kebab-case uses hyphens and CONSTANT_CASE is snake_case in capitals. Existing camelCase input is split at the capital letters first, so "userAccountId" becomes "user_account_id". Each line of your input is converted separately, which makes it easy to rename a list of variables at once.
Where each style is used
JavaScript and Java variables use camelCase, classes use PascalCase, Python and Ruby prefer snake_case, CSS classes and URL slugs use kebab-case, and constants or environment variables use CONSTANT_CASE. Accented letters are handled correctly in all modes.
Example
A heading turned into snake_case for a file or variable name.
Input
monthly sales report
Output
monthly_sales_report