Case converter

Try the sample first

The default paste has a mixed block on purpose. Leave Title Case selected and hit Convert. You should see each word start with a capital letter, including short words like the and over. Switch to Sentence case and Convert again: only the first letter after a start or after . ! or ? plus a space should rise.

UPPERCASE and lowercase are blunt: every letter flips. They ignore sentence boundaries on purpose.

Side-by-side on one line

Same source string under each mode so you can spot the rule without guessing:

Title Case still capitalizes Is. Sentence case does not, because that word is mid-sentence.

When Title Case fights style guides

Chicago, AP, and many house styles leave small function words lowercase in titles (a, an, the, of, and, and similar), then force a capital on the first and last word anyway. This tool does not keep that exception list. It capitalizes every whitespace-separated token so the behavior stays predictable and language-agnostic.

If you need a house style, run Title Case here, then lower the short words you care about. That is usually faster than typing the whole headline by hand.

Limits worth knowing

• Not an identifier renamer. For camelCase, snake_case, kebab-case, PascalCase, or CONSTANT_CASE, use the camel case converter.
• Sentence detection is punctuation-based (. ! ? plus whitespace). Abbreviations like U.S.A. or e.g. can create false sentence starts.
• Unicode letters follow the browser toLocaleUpperCase / toLocaleLowerCase rules. Ligatures and some locale edge cases may not match a print stylebook.
• No upload, no save, no sync. Refresh clears the page unless you copy the result out.

FAQ