Fix text case in one click
Typed a whole paragraph with caps lock on? Pasted a headline that needs to be a normal sentence? This converter rewrites your text in seven styles: UPPERCASE for labels and warnings, lowercase for cleaning up shouted text, Title Case for headlines, Sentence case for body text, plus playful alternating and inverse modes. Pick a style, and the converted text appears instantly, ready to copy.
Which case should you choose?
- Headlines and titles: Title Case.
- Emails and articles: Sentence case.
- Buttons, labels and short calls to action: UPPERCASE, used sparingly.
- Code-adjacent text and usernames: lowercase.
How the converter works under the hood
Each style applies a small, predictable rule to your text, and nothing else about the text changes. UPPERCASE and lowercase simply map every letter to its upper or lower form. Title Case works in two steps: it first lowercases everything, which cleans up random capitals, then capitalizes the first letter of each word, where a word is detected at the start of the text or after a space, an opening bracket or a quote mark. Sentence case also starts by lowercasing everything, then looks for the opening letter of the text and the first letter after a period, question mark or exclamation mark, and capitalizes just those. Alternating case walks through the text letter by letter, flipping between upper and lower each time it meets a letter, while spaces and punctuation pass through without disturbing the pattern. Inverse case examines each letter individually and swaps it for the opposite form, so the shape of the original capitalization is flipped rather than rebuilt.
A worked example
Start with this messy line, typed with caps lock partly on: "tHE QUICK brown FOX jumps OVER the lazy dog". UPPERCASE gives "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG", while lowercase gives the same sentence entirely in small letters. Title Case produces "The Quick Brown Fox Jumps Over The Lazy Dog", ready to use as a heading. Sentence case produces "The quick brown fox jumps over the lazy dog", which is how the line should look in normal body text, once you add the closing punctuation back. Inverse case gives "The quick BROWN fox JUMPS over THE LAZY DOG", preserving the original pattern in mirror form. Seeing all five results from one input shows why choosing the right mode matters more than retyping by hand.
Tips for getting better results
- Convert a copy, not your only version: some conversions cannot be undone, because lowercasing destroys the record of which letters were capitals, so keep the original text somewhere safe first.
- Proofread proper nouns after Sentence case: the converter lowercases names, places and brands along with everything else, so scan the result and restore capitals for names like London, Google or Monday.
- Fix small words manually in titles: Title Case capitalizes words like "and" and "the" in the middle of a headline, and many style guides prefer them lowercase there, so adjust those few words by hand.
- Pair it with a cleanup pass: once the case is right, run the text through the Remove Duplicate Lines tool if it is a list, or turn a lowercase heading into a web address with the Slug Generator.
Common mistakes to avoid
- Converting code, passwords or links: case is meaningful in all three, and changing it can break a URL, invalidate a password or alter a product code, so convert prose only and leave technical strings untouched.
- Using UPPERCASE for whole paragraphs: blocks of capital letters are harder to read and look like shouting online; reserve them for short labels, warnings and buttons.
- Trusting alternating case for anything serious: it is hard to read, unfriendly to screen readers, and makes a message look like a joke, so keep it for playful posts only.
- Converting quoted text without checking: quotations should keep the capitalization of the original source, so leave quotes in their published form rather than restyling them to match your page.