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. Paste in a sentence, a paragraph or a whole document, choose the case you want, and the result appears instantly — ready to copy. It is the fastest way to fix text that came out all-caps, all-lowercase, or with inconsistent capitalization.

It handles five common cases. UPPERCASE makes every letter a capital, useful for headings and emphasis. lowercase does the opposite, handy for tidying up shouty text or normalising 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.

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.

Related tools

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