Paste any text and convert it to UPPERCASE, lowercase, Title Case, sentence case or alternating case in one click — including rescuing whole paragraphs typed with Caps Lock on.
UPPERCASE turns every letter capital. It suits short labels, headings, acronyms and warnings — and reads as shouting in anything longer than a line or two, which is why it is best kept short. lowercase turns everything small: useful for normalising email addresses, usernames, tags and code, and for undoing a document that arrived in all caps. Title Case capitalises the main words of a heading and leaves small joining words — a, an, the, and, of, in, on — in lowercase, which is the style most books, articles and videos use for headlines. Sentence case capitalises only the first letter of each sentence (plus names and places it cannot detect automatically, so give those a quick check), and is the default for body text, emails and most modern interfaces. Capitalized Case starts every single word with a capital, joining words included — heavier than Title Case, and common in form labels and older headline styles. The two playful cases, aLtErNaTiNg and iNVERT, exist for social posts and memes; inverse case is also the fastest rescue for a paragraph typed with Caps Lock held down, because it flips capitals to small letters and small letters to capitals in one pass.
1. Paste or type your text into the box. The counter underneath shows words and characters as you go, so you can confirm everything arrived.
2. Click the case you want. The conversion happens instantly, in place — click a different button to try another style on the same text.
3. Use Copy text to take the converted text back to your document, or Download .txt to save it as a file.
4. After sentence case, scan once for names, places and the word “I” — no automatic converter can know which ordinary-looking words are proper nouns in your text.
Case is invisible until it is wrong, and then it is the only thing a reader sees. A headline pasted into a content system in the wrong style has to be retyped by hand, word by word. An email address typed with random capitals usually still works, but a password, a case-sensitive username, a file path on a Linux server or a discount code does not forgive so easily — those must match exactly, and normalising them to lowercase is often the first debugging step. In writing, consistency is the real rule: pick Title Case or sentence case for your headings and use it everywhere, because a page that mixes the two looks careless even when every individual heading is “correct”. Style guides differ on the details — which small words stay lowercase in Title Case, how long a word must be to earn a capital — so treat this tool's Title Case as the common convention, and your own house style as the final word where the two disagree.
The most common job this tool does is rescue text typed with Caps Lock on. Retyping is the slow fix; converting is the right one — but choose the right conversion. Straight to lowercase loses every sentence start and name. Sentence case restores a normal paragraph in one click. If the original text mixed cases deliberately — some words capitalised, most not — inverse case is the exact undo, flipping each letter to the opposite of what Caps Lock did to it. Either way, a page of accidental capitals is a ten-second fix, not a retype.
Is my text uploaded? No. Conversion runs in your browser; nothing leaves your device and nothing is stored when you close the page.
What is the difference between Title Case and Capitalized Case here? Title Case leaves short joining words (a, an, the, and, of, in, on, at, by, for, with) lowercase unless they start the heading. Capitalized Case capitalises every word without exception.
Does sentence case fix names? It capitalises the first letter after each sentence-ending punctuation mark. It cannot recognise names in the middle of a sentence, so check those afterwards — no converter can do that reliably.
Will it change numbers, links or formatting? Numbers and punctuation pass through unchanged, and line breaks are preserved. Text is handled as plain text, so pasting from a document keeps the words, not fonts or colours.
Can I convert a whole document? Yes — paste as much as you like. Everything happens locally, so length is limited only by your device.