Case Converter

How to use it

1. Paste or type your text in the first box.
2. Click the case you want, UPPERCASE, lowercase, Title Case, Sentence case, capitalized or alternating.
3. Copy the converted result with the Copy result button.

What is letter case conversion?

Letter case conversion means changing which letters in a text are capital and which are small, without touching the words themselves. Simple modes such as UPPERCASE and lowercase change every letter one way. Title Case is the tricky one, and this case converter follows headline style.

Title Case: capitalize every word EXCEPT short joining words
(a, an, the, and, of, to, in, for, via...) unless the word is
first, last, or follows : . ! ?

Sentence case lowercases everything, then restores a capital at the start of each sentence. Capitalize Each Word uppercases the first letter of every word with no exceptions. All modes use Unicode rules, so accented and Cyrillic letters convert the same way plain letters do.

Worked example

Title case rules by style guide

AP and APA capitalize prepositions of four or more letters; Chicago lowercases prepositions no matter how long. Every guide capitalizes the first and last word of a title, and verbs are always capitalized, however short.

Which case should you use?

Title Case capitalizes the first letter of each major word and is standard for headlines and the titles of books, films and articles. This case converter follows common headline style: short joining words such as a, an, the, of, to, in, for and via stay lowercase unless they begin or end the title or follow a colon or period. Short verbs are not on that list, so Is and Be get their capital.

Sentence case capitalizes only the first word of each sentence, the way you write ordinary prose. It lowercases everything first, so names and acronyms in the middle of a sentence come out lowercase; NASA becomes nasa. Read through the result and restore those by hand.

Capitalize Each Word is the blunt version of Title Case: it uppercases the first letter of every word, small words included, which suits menu labels, product names and form fields. Apostrophes are respected, so don't becomes Don't and O'Brien stays O'Brien.

Shortcuts in other apps

Microsoft Word cycles selected text through lowercase, UPPERCASE and Capitalize Each Word when you press Shift+F3. Google Docs offers the same three options under Format, Text, Capitalization. Excel and Google Sheets use the UPPER, LOWER and PROPER functions. None of them provides a true headline-style Title Case that knows to leave of and the lowercase, which is the main reason to paste a heading here instead.

Alternating case

aLtErNaTiNg case switches between lowercase and uppercase letter by letter, starting lowercase, the format made popular by the SpongeBob mocking meme. Spaces and punctuation take a slot in the sequence too, so the pattern can appear to restart after a space. It has no serious use, but it is the fastest way to produce it for a caption or username.

All six modes use the browser's built-in Unicode rules, so accented, Greek and Cyrillic letters convert correctly, in the word-based modes as well: élan becomes Élan and über becomes Über. Nothing you paste leaves your device.

Common uses

• Formatting headlines and titles correctly
• Fixing text that was typed with Caps Lock on
• Preparing names, labels and menu items
• Creating stylized aLtErNaTiNg text for social posts
• Cleaning up all-caps or all-lowercase pasted text
• Converting spreadsheet exports that arrived in capitals
• Standardizing product names and email subject lines

When to use it

• You need to fix text typed with Caps Lock on, and a case converter beats retyping the whole paragraph.
• A headline needs proper title case and you cannot remember whether to capitalize a preposition like with.
• You want to convert uppercase to lowercase in a spreadsheet export full of shouting product names.
• A list of customer names arrived in mixed case and every entry should read First Last, capitalized.
• You want aLtErNaTiNg case for a meme caption without tapping Shift on every other letter.

Related tools

Slug Generator goes further than lowercase: it also strips accents and symbols and joins words with hyphens for a clean URL.

Word Counter checks length and reading time once the capitalization is fixed, useful for headlines with a character budget.

Find and Replace Text handles changes a case mode cannot, such as swapping one recurring word or fixing a repeated typo.