Uppercase & lowercase
Convert text to upper, lower, title or sentence case.
How to use
Paste text and switch it between UPPERCASE, lowercase, Title Case and Sentence case; the result appears below with a Copy button. The conversion runs in the browser, so a draft stays where it is, and it uses the case rules of the page’s language.
Title Case lowers everything first and then capitalises the first letter of every word, including short words such as of and the, and the parts of hyphenated words (Jean-Paul). Letters after an apostrophe stay lowercase, so it’s stays It’s. Sentence case lowers everything and capitalises the first letter of the text and every letter that follows a full stop, question mark or exclamation mark and a space.
Both modes lowercase everything they do not capitalise, so names, acronyms and brand names inside the text lose their capitals (NASA becomes Nasa) and have to be corrected by hand.
Title Case is an English convention, and even English style guides disagree about which short words stay lowercase. Spanish, French, Portuguese and Italian titles generally use sentence case, so applying Title Case to them looks wrong to a native reader. Uppercase is also not always reversible: German ß becomes SS, and lowercasing that gives ss, not the letter you started with.
Example
hello world → Title CaseHello World.café au lait → Title CaseCafé Au Lait: accented letters are capitalised like any other.straße → UPPERCASESTRASSE: uppercase expands ß, and the change cannot be undone.THE END. it was late → Sentence caseThe end. It was late
Frequently asked questions
Why does uppercase not convert back cleanly?
Because a few letters have no one-to-one uppercase form. The German ß expands to SS, so lowercasing the result gives ss and the original letter is gone. Turkish is the other classic case: it distinguishes dotted and dotless i, so a naive conversion changes the word.
Should a Spanish or French title use Title Case?
No. Capitalising every significant word is an English habit; those languages normally capitalise only the first word and proper nouns. Sentence case is the correct choice, and Title Case is a common giveaway of text translated mechanically from English.
Why did my acronyms become lowercase?
Every mode except UPPERCASE starts by lowering the whole text, so acronyms and names lose their capitals. Fix them after converting.
Does it change anything except letters?
No. Spaces, punctuation, numbers and line breaks stay exactly as they were.