What this case converter does
Text arrives in the wrong case constantly: a heading pasted from a PDF arrives in ALL CAPS, a product name typed in a hurry comes out as "iPHONE case", a sentence copied from an old email has its capitals scattered at random. Retyping the text by hand is slow and simply trades old errors for new ones. This converter fixes the case in one click: paste your text, choose the case you want, and copy the result from the box on the right. It offers the four cases people actually need — UPPERCASE, lowercase, Title Case and Sentence case — plus two playful ones, aLtErNaTiNg case and Invert Case. As you type it also counts the characters, the characters without spaces, the words and the lines in your text, so the page doubles as a quick check before you paste the result somewhere that enforces a limit, such as a form field, an advert or a social post.
The cases, explained
| Case | Example |
|---|---|
| UPPERCASE | THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG |
| lowercase | the quick brown fox jumps over the lazy dog |
| Title Case | The Quick Brown Fox Jumps Over The Lazy Dog |
| Sentence case | The quick brown fox jumps over the lazy dog |
| aLtErNaTiNg | ThE qUiCk BrOwN fOx JuMpS oVeR tHe LaZy DoG |
| Invert Case | tHE QUICK BROWN FOX jumps over the lazy dog |
UPPERCASE capitalises every letter. Use it for labels, warnings and very short headings — and sparingly, because long passages in capitals are harder to read and read as shouting in messages. lowercase removes every capital, which is the fastest way to normalise a list of names, tags or email addresses that were typed inconsistently. Title Case capitalises the first letter of every word and lowercases the rest: the standard for headlines, article titles and button labels. Note that this tool capitalises every word, including small ones like "the" and "of" — editorial style guides such as AP and APA lowercase those minor words in titles, so for publication-grade headlines, lowercase the minor words by hand after converting. Sentence case capitalises only the first letter of each sentence, exactly as ordinary prose is written, and is the right repair for text that arrived in all caps. aLtErNaTiNg case alternates capitals letter by letter, and Invert Case flips every letter to the opposite of what it was; both are for emphasis, jokes and social posts rather than documents.
Worked example: rescuing a pasted heading
Say a document gives you the heading "tHE bEST wAY tO sAVE mONEY oN yOUR gROCERY bILL" — capitals in all the wrong places because it was typed while Caps Lock was half on. Paste it above and press Title Case and you get "The Best Way To Save Money On Your Grocery Bill", ready to drop into an article. Press Sentence case instead and you get "The best way to save money on your grocery bill". The same trick rescues whole paragraphs: if a notice arrives as "PLEASE NOTE THAT THE OFFICE WILL BE CLOSED TOMORROW. NORMAL HOURS RESUME NEXT WEEK.", Sentence case repairs both sentences in one pass — "Please note that the office will be closed tomorrow. Normal hours resume next week." And if you need the emphasis the other way, selecting Invert Case on an ordinary sentence like "Meeting moved to 3 pm" gives "mEETING MOVED TO 3 PM" — the capitals now mark the parts that were plain, which is a surprisingly effective way to make a short notice stand out on a busy page.
How the conversion works
Each button applies one simple, mechanical rule to every letter in the text. Uppercase and lowercase map each letter to its capital or small form, including accented and non-English letters, so "café" and "CAFÉ" convert cleanly. Title Case first lowercases the whole text, then capitalises the first letter of each word, where a word starts at the beginning of the text or after a space or punctuation mark. Sentence case lowercases everything, then capitalises the first letter of the text and the first letter after each full stop, question mark or exclamation mark. Alternating case walks through the letters one by one, switching between capital and small for each letter it meets — spaces, digits and punctuation do not consume a turn. Invert Case flips each letter individually. Because the rules are mechanical, the converter cannot know that "Apple" is a company, that "march" is a month rather than a walk, or that the pronoun "i" should be "I" — the mistakes section below covers the quick hand-fixes worth making after any conversion.
Common mistakes and quick fixes
- Expecting style-guide Title Case. This tool capitalises every word, including "the", "of" and "and". AP and Chicago styles lowercase minor words in headlines; if the headline is for publication, convert first, then lowercase the small words your style guide lists.
- Trusting Sentence case with names. Sentence case lowercases everything that is not at a sentence start, so "we visited Paris with Dr Smith" becomes "we visited paris with dr smith". Re-capitalise proper nouns and the pronoun "I" after converting.
- Shouting by accident. A whole email or document in UPPERCASE reads as angry and is measurably harder to read. Convert it to Sentence case and let punctuation do the emphasising instead.
- Assuming numbers and symbols change. They do not — case applies to letters only, so prices, dates, codes and punctuation pass through untouched, which is almost always what you want.
- Converting text you still need in the original. The converted text replaces nothing in your source document — it appears in the output box — but copy it out before you close the page, because the page keeps nothing.
Private by design
The conversion runs entirely in your browser, like every ToolFigure tool: your text is never uploaded, stored or shared, and the page keeps working offline once it has loaded. Paste drafts, lists or personal notes with the same confidence as the word counter — nothing leaves your device.
Frequently asked questions
What is the difference between Title Case and Sentence case?
Title Case capitalises the first letter of every word — The Quick Brown Fox — and is used for headlines and titles. Sentence case capitalises only the first letter of each sentence — The quick brown fox — and is how ordinary prose, and most modern interface text, is written.
Does this tool follow AP or APA title case rules?
Not exactly. This converter capitalises every word, including minor words like 'the', 'of' and 'and'. AP, APA and Chicago styles lowercase minor words in titles, so after converting, lowercase those small words by hand if your headline must follow a style guide.
Why did Sentence case lowercase a name in the middle of a sentence?
Because the rule is mechanical: everything is lowercased first, then only sentence starts are capitalised. The tool cannot tell that 'paris' is a place or that 'smith' is a person. Re-capitalise proper nouns — and the pronoun 'I' — after converting.
Can I convert a whole document?
Yes — paste as much text as you like; there is no word limit built into the page, and the conversion is instant even for book-length text on most devices. The counters under the input box show the character, word and line counts as you paste.
Is my text uploaded or saved anywhere?
No. The conversion happens in your own browser with JavaScript; ToolFigure's servers never receive the text, and nothing is stored when you close the page. That is the same privacy rule as every tool on this site.
