Title case and sentence case
Title Case capitalises each main word and leaves short joining words such as and, of and the in lower case unless they start or end the line, as most English style guides do: the lord of the rings becomes The Lord of the Rings. Hyphenated words get a capital on each part, Well-Known. Sentence case lowers everything, then capitalises the first letter of each sentence and the word I.
Cases for code
camelCase, snake_case and kebab-case split each line into words, drop the punctuation and join the words again: Hello World example becomes helloWorldExample, hello_world_example or hello-world-example. Words already in camelCase are split at their capitals, so you can switch from one to another and back. Each line is converted on its own, so a list of names stays a list.
Typed with Caps Lock on?
sWAP cASE turns every capital small and every small letter capital, so hELLO wORLD becomes Hello World. Press Undo if a case was not the one you wanted; it steps back one change at a time.
Questions
Does it work with accents and other alphabets?
Yes for upper and lower case: é becomes É, and Greek and Cyrillic change too. The capital of i is always I, so a Turkish dotted İ needs fixing by hand. Title Case only knows the English joining words.
Why did a name I typed with a capital turn small?
Sentence case lowers everything first, because it cannot tell a name from an ordinary word. Put the capitals back on names afterwards, or use Title Case for headings.
Is my text sent anywhere?
No. Every change happens in this page on your device, and nothing is saved once you close it.