Case Converter

Instantly switch text between UPPERCASE, lowercase, Title Case, Sentence case and aLtErNaTiNg case.

🔒 Runs entirely in your browser — nothing you type is uploaded or stored on a server.

The Case Converter changes the capitalization of your text in one click — the same job people mean by “case change” or “capitalization converter”. Paste in a sentence, a paragraph or a whole document, choose the case you want, and the result appears instantly, ready to copy.

Also on Txtset: apply smart style-guide title capitalization.

It handles five common capitalization styles. UPPERCASE makes every letter a capital, useful for headings and emphasis. lowercase does the opposite — the tool most people reach for when going from lowercase to caps, or the other way, to tidy up shouty text or normalise data. Title Case capitalises the first letter of every word, which suits names and short labels. Sentence case capitalises only the first letter of each sentence, the way normal prose is written. And aLtErNaTiNg case flips between lower and upper letters for a playful, meme-style effect. Title Case here capitalises every word; if you're setting a headline or a book title and need the style-guide rules — where of, and and the stay lowercase — use the dedicated Title Case Converter instead.

It's a fast fix for text that arrived in the wrong capitalisation entirely: a form field that forces UPPERCASE, a pasted quote in all lowercase, or a document with inconsistent capitals scattered through it. Rather than retyping, paste it here, pick the case, and copy the corrected version straight back out.

Because everything runs in your browser, you can safely convert sensitive text — notes, client names, draft emails — without it ever leaving your device. The conversion is instant and reversible: switch between cases as many times as you like to find the one you need.

How to use

  1. Type or paste your text into the input box.
  2. Click the case you want: UPPERCASE, lowercase, Title Case, Sentence case or aLtErNaTiNg.
  3. Your converted text appears immediately in the result box.
  4. Press Copy to put the result on your clipboard, or switch to a different case.
  5. Use Clear to empty the box and start again.

Examples

Fixing caps-lock text
“PLEASE SEND THE REPORT” becomes a calm “please send the report” with lowercase, or a proper “Please send the report.” with Sentence case.
Tidying a heading
“the art of slow cooking” converts to “The Art Of Slow Cooking” in Title Case — or use the dedicated Title Case Converter for smarter handling of small words.
Creating meme text
“this is fine” becomes “tHiS iS fInE” in aLtErNaTiNg case, the classic mocking-SpongeBob style.
Normalising data
A column of mixed-case email subjects can be forced to lowercase for consistent comparison.

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”). Sentence case capitalises only the first letter of each sentence (“The quick brown fox.”). Use Title Case for headings and Sentence case for normal writing.
Does it handle multiple sentences and line breaks?
Yes. Sentence case detects the start of each sentence after a period, question mark or exclamation mark, and all modes preserve your line breaks and spacing.
Will it change my punctuation or numbers?
No. Only letters are affected. Numbers, punctuation and symbols are left exactly as they are.
Is there a limit on how much text I can convert?
No practical limit — it handles everything from a single word to long documents, all processed instantly in your browser.
Do you store the text I convert?
No. The tool is 100% client-side. Your text never leaves your browser and is not logged anywhere.
Why would I use aLtErNaTiNg case?
It is mostly used for sarcasm or memes on social media, where alternating capitals imply a mocking tone. It is a fun, expressive style rather than a formal one.
Is this the same as a “capitalization converter”?
Yes — capitalization converter, case converter and case change are different names for the same task. This tool covers all five common capitalization styles: UPPERCASE, lowercase, Title Case, Sentence case and aLtErNaTiNg.

Embed this tool on your site

Paste this where you want Case Converter to appear. It runs in your visitor's browser exactly as it does here — nothing they type reaches a server, yours or ours. Free, no sign-up, no tracking script.

Keeping the credit line under the frame is what makes this free — it is two ordinary links, no script and no nofollow. Preview the embed.

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