Case Converter

Paste text or an identifier to see it in every common case at once — camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, Sentence case and the plain upper and lower forms.

Existing casing is understood rather than ignored: getHTTPResponse and get_http_response both split into the same words, so round-tripping between conventions does not mangle them.

How it works

Converting case is really two steps: work out where the word boundaries are, then re-join them in the target convention. The first step is where naive implementations fail.

Boundaries can be marked by separators (_, -, spaces) or by capitalisation alone. The awkward case is a run of capitals: getHTTPResponse should split as get / HTTP / Response, not get / H / T / T / P / Response. The rule is to break before the last capital in a run when a lowercase letter follows it — which this tool applies, so acronyms survive.

Where each convention belongs:

• camelCase — JavaScript and Java variables and methods.
• PascalCase — class names in most languages; also React components.
• snake_case — Python and Ruby variables, and SQL column names.
• kebab-case — URLs, CSS classes, HTML attributes and file names. Note it is invalid as an identifier in most languages, because the hyphen parses as subtraction.
• CONSTANT_CASE — constants and environment variables.

Title Case here follows editorial convention rather than simply capitalising everything: minor words such as a, the, of and to stay lowercase unless they are the first or last word. That is the rule most style guides use, and it is what makes a heading read naturally.

Frequently asked questions