Case Converter — Uppercase, Lowercase, Title & More

Case Converter

Case Converter turns any block of text into one of six letter-case styles: UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg CaSe, and iNvErSe CaSe. Paste text, pick a mode, and the converted result appears in a separate box with a live character count next to a copy button.

How each mode works

UPPERCASE and lowercase apply a single rule to the whole string. Title Case lowercases the text first, then capitalizes the first letter of every word separated by a space, including short words such as of or in — it does not apply the exceptions a copy editor would use for a book title. Sentence case also lowercases everything first, then capitalizes only the very first letter of the text and the first letter that follows a period, exclamation mark, or question mark plus a space. Alternating case ignores the letters that were already there: it lowercases every character at an even position, counting from zero, and uppercases every character at an odd position, so the pattern is fixed regardless of the input. Inverse case is the only mode that reads the existing letters — an uppercase letter becomes lowercase and a lowercase letter becomes uppercase — while digits, spaces, and punctuation are left untouched.

Concrete use cases

Pasted text that arrives in ALL CAPS from a scanned document, a heading copied from a PDF where every letter is capitalized, or a list of names where the casing is inconsistent from row to row are common reasons to run text through one of these six modes before using it elsewhere.

Example: converting a sentence

Typing chicago recorded its coldest april on record in 2018. and selecting Sentence case produces Chicago recorded its coldest april on record in 2018. — only the first letter changes, because the period sits at the very end with no word after it. Running the same sentence through Title Case instead produces Chicago Recorded Its Coldest April On Record In 2018., where every word gets a capital, including its, on, and in.

Before and after by mode

The table below shows how each mode transforms the same input, BERLIN marathon 2019.