UPPERCASE Converter

SHOUT your text in all caps — free, instant, runs in your browser.

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What is UPPERCASE?

UPPERCASE — also called all caps — converts every letter to its capital form. Digits, spaces and punctuation are left exactly as they are; only cased letters change.

UPPERCASE examples

hello world example → HELLO WORLD EXAMPLE
Warning: disk almost full → WARNING: DISK ALMOST FULL
sale ends friday → SALE ENDS FRIDAY

Where is UPPERCASE used?

All caps is the natural style for acronyms (NASA, HTML, FAQ), headings and banners, warning and legal text, and short bursts of emphasis. Long passages in all caps are harder to read and can feel like shouting, so it works best in small doses.

UPPERCASE in programming

Uppercase text appears in code as well: constants and environment variables use CONSTANT_CASE, which is UPPERCASE with underscores instead of spaces — use the dedicated converter linked below when you need that form.

Common mistakes when converting case

Expecting editorial Title Case. The Title Case button capitalizes every word, including short ones: "the lord of the rings" becomes "The Lord Of The Rings". Style guides like AP and Chicago keep words such as "of", "the" and "and" lowercase, so adjust those by hand afterward.
Losing apostrophes. Word-based styles (Title Case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE) split on anything that is not a letter or digit, so "don't stop" turns into "Don T Stop" or "don_t_stop". Remove or restore apostrophes after converting.
Sentence case and proper nouns. Sentence case lowercases the whole text, then capitalizes only the first letter of each sentence, so "i visited NASA in june. it was fun." becomes "I visited nasa in june. It was fun." Re-capitalize names and acronyms yourself.

Pro tips

Rescue a Caps Lock accident with InVeRsE CaSe. Text typed as "hELLO wORLD" while Caps Lock inverted your Shift key flips back to "Hello World" in one click.
Acronyms split cleanly. "HTMLParser" converts to "htmlParser" with camelCase and "html_parser" with snake_case, because the word splitter detects where an acronym ends and the next word begins.
Only letters alternate. In aLtErNaTiNg CaSe, digits, spaces and punctuation stay in place and do not break the pattern: "abc 123 def" becomes "aBc 123 dEf".

Frequently asked questions

Does UPPERCASE change numbers or punctuation?

No. Only cased letters are converted; digits, spaces, punctuation and symbols pass through unchanged, so 'Error 404!' becomes 'ERROR 404!'.

Does it handle accented and non-Latin letters?

Yes. Conversion is Unicode-aware: accented letters like é become É, German ß becomes SS, and Greek or Cyrillic text is capitalized correctly. Scripts without letter case pass through unchanged.

What is the difference between UPPERCASE and CONSTANT_CASE?

UPPERCASE keeps your original spacing (MAX RETRY COUNT), while CONSTANT_CASE also replaces spaces and other separators with underscores (MAX_RETRY_COUNT), producing a valid identifier.

Other case converters

Or switch between every style in one place on the Case Converter homepage.