Convert text between cases, in your own browser.

camelCase (exampleText) is what JavaScript uses for variables and function names. PascalCase (ExampleText) is what the same languages use for classes and components. snake_case (example_text) is the convention in Python and in most database columns. kebab-case (example-text) is what URL slugs, CSS class names and filenames want.

UPPERCASE is for constants and short abbreviations. lowercase is for tags, metadata and anything that has to match regardless of how somebody typed it. Sentence case and Title Case are the editorial pair: sentence case for body copy and most headings, title case for titles where the house style asks for it.

It capitalises every word except a short list of small ones — a, an, and, as, at, but, by, en, for, if, in, of, on, or, the, to, v, via and vs — which stay lowercase unless they are the first or last word in the text. That is the ordinary editorial rule, and it is why "the" is capitalised at the start of a title and not in the middle.

Hyphenated words get both halves capitalised, so "state-of-the-art" comes back as "State-Of-The-Art". If your house style disagrees, that one you fix by hand.

It lowercases everything first, then capitalises the first letter after each full stop, question mark, exclamation mark or line break. Your line breaks are kept; a run of spaces after a full stop is normalised to one.

It has no idea that Delhi or Tuesday are proper nouns, and it will not put back a capital it has taken away. Sentence case is a first pass over a shouted paragraph, not a copy editor.

Both lowercase the text, turn every run of whitespace into a single separator, and then delete everything that is not a letter, a digit or that separator. Punctuation goes, and so does every accented or non-Latin character: "café menu" comes back as caf_menu, and a line of Tamil or Devanagari comes back empty.

If you are making URL slugs from anything but plain English, read the output before you use it. This is the one place where the tool will quietly hand you something wrong rather than refuse.

Inverse case flips every character: capitals go down, lowercase goes up. Alternating case ignores what you typed entirely and lowercases every character in an even position while uppercasing the odd ones — spaces count as characters, which is why the pattern appears to shift across a word break.

Neither is a naming convention and neither is reversible in any useful sense. They are here because people ask for them.

Developers moving a set of names from one language’s convention to another. Writers making headings consistent across a document. Anyone building URL slugs out of titles. Designers keeping button labels and interface text in one style rather than five.

All of it is the kind of job that is beneath writing a script and above doing by hand, which is exactly the gap a small tool fills.