Case Converter

Change the case of any text in one tap

A case converter takes whatever text you give it and rewrites the letters in a different pattern of capitals and lowercase, without you having to retype a single word. It sounds like a small thing, but anyone who has ever pasted a heading that arrived in ALL CAPITALS, or received a paragraph typed entirely in lowercase, knows how tedious it is to fix by hand. This tool does the whole job instantly: paste your text, tap the style you want, and copy the result. Everything runs inside your browser, so your words are never uploaded and the conversion is immediate even offline.

The box above accepts any length of text, from a single title to several paragraphs. Each button applies one transformation to everything in the box, and you can keep tapping different buttons to compare styles until one looks right. When you are happy, the copy button places the converted text on your clipboard ready to paste wherever you need it.

The styles you can apply

UPPERCASE turns every letter into a capital. It is useful for headings, acronyms, notices and anywhere you want text to shout, though large blocks of uppercase are harder to read, so it works best in short bursts.

lowercase does the opposite, making every letter small. It is handy for tidying up text that was typed with the caps lock on, for a deliberately relaxed style, or for normalising data such as tags, usernames and email addresses before you compare them.

Title Case capitalises the first letter of every word. This is the classic style for titles, headlines and names of things. It gives a clean, formal look, and this tool leaves the rest of each word untouched so existing capitals inside a word are respected.

Sentence case capitalises only the first letter of each sentence and lowercases the rest, exactly like ordinary writing. It is the fastest way to rescue a paragraph that was pasted in the wrong case, turning a shouty or all-lowercase block back into something that reads naturally.

aLtErNaTiNg case flips between lower and upper letter by letter. It has no formal use but is popular online for a playful or sarcastic tone, and it is a fun way to make a short phrase stand out.

iNVERSE case swaps the case of every letter, so capitals become lowercase and lowercase becomes capitals. It is the quickest fix when you have typed a whole line with the shift key stuck the wrong way, and it doubles as a quirky text effect.

Small caps replaces ordinary lowercase letters with miniature capital letterforms. Because it uses real Unicode characters rather than a font setting, the small caps survive being copied into places that do not normally support them, such as social media bios and chat apps.

Where a case converter comes in handy

Writers and editors reach for case conversion constantly. Copy pulled from a PDF, a spreadsheet or an old website often arrives in the wrong case, and re-typing it wastes time and invites mistakes. Converting a messy heading to Title Case, or a shouted paragraph to Sentence case, cleans it up in a second and keeps the original wording exactly as it was.

Developers and data workers use lowercase and uppercase conversion to normalise information. Comparing two email addresses, tags or product codes is only reliable when they are in a consistent case, and flattening everything to lowercase first removes a whole class of subtle bugs. Marketers and social media managers, meanwhile, use Title Case for polished headlines and small caps or alternating case to give short posts a distinctive look that catches the eye in a busy feed.

Students and everyday users benefit too. If a friend sends a message in frustrating all-caps, Sentence case makes it comfortable to read. If a form insists on lowercase, one tap prepares your text. Because the tool keeps punctuation, numbers and symbols untouched, you never have to worry about it mangling anything other than the letters themselves.

How the conversions treat your text

Each style changes only the letters and leaves everything else exactly as you typed it. Spaces, line breaks, digits, punctuation and emoji all pass through unchanged, so the shape of your text — its paragraphs, its lists, its numbers — is preserved. Title Case decides where words begin using the natural boundaries between letters, which means hyphenated and accented words are handled sensibly. Sentence case looks for the punctuation that ends a sentence to decide where the next capital belongs.

Because the letters are re-cased using proper Unicode rules, accented and non-English letters convert correctly too: an "é" becomes "É" in uppercase and back again, and the same holds for the many alphabets that have upper and lower forms. Scripts that do not distinguish between capital and small letters, such as Chinese, Japanese, Arabic and Hebrew, are simply left as they are, so mixed-language text stays intact.

Private, instant and free

There is no sign-up, no limit and no cost. The entire converter is a small piece of code that runs on your device, which is why it responds the instant you tap a button and keeps working even with no internet connection. Nothing you paste is sent anywhere, making it safe to use with confidential drafts, client material or anything you would rather not upload to an unknown server.

To get started, click into the box, type or paste your text, and choose a style. If the result is not quite what you wanted, tap another button to try a different one — the original wording never changes, only the pattern of capitals. When it looks right, use the copy button and paste your freshly cased text wherever it needs to go.