Title Case here is mechanical, not editorial
The Text Case Converter capitalises the first letter of every whitespace-separated run and lowercases the rest, which is a purely mechanical rule rather than the editorial convention most style guides actually follow — “of”, “the” and “and” all get capitalised along with everything else, so a house style that keeps short prepositions lowercase needs a manual pass over the result afterwards.
camelCase and snake_case exist for identifiers, not prose
Both forms are built for variable names, database columns and JSON keys rather than sentences, and both will visibly mangle prose that contains ordinary punctuation. camelCase strips every non-alphanumeric character and capitalises whatever letter follows it; snake_case lowercases everything and turns runs of whitespace into single underscores.
snake_case is destructive by design
Anything that is not a letter, a digit or an underscore is simply discarded during the snake_case conversion rather than transliterated into something else — an accented letter or an ampersand disappears outright, which can silently shorten a name in a way that is easy to miss unless the result is checked directly against the source.
Uppercase here is permanent, unlike a styling choice
If the only goal is the visual appearance of capitals, CSS `text-transform` leaves the underlying text completely intact and still readable correctly by screen readers, which announce the actual characters rather than however they happen to be styled. Converting the characters themselves through this tool is a real, permanent change to the text rather than a display effect that can simply be styled away again.