Free case converter

Case converter

What the case converter does

This tool converts text between three cases: Title Case, where the first letter of every word is capitalized; UPPERCASE, where every letter is capitalized; and lowercase, where none of them are. Paste in text typed in any mixture of cases and get back a version converted consistently to whichever one you pick.

It runs in your browser. Paste, choose a case, copy the result. Nothing is uploaded, there's no account and no limit on how much text you convert.

How it works

How to convert text case in three steps

One choice to make, nothing else to configure.

Step 1

Paste your text into the input box.

Step 2

Choose Title Case, UPPERCASE or lowercase.

Step 3

Copy the converted text from the output box.

The exact rule

How this tool's Title Case actually works

This converter lowercases the entire input first, then capitalizes the first letter of every word. That's a simple, consistent rule, and it's worth understanding exactly what it does and doesn't do, because it's not the same as the style-guide convention some editors expect.

Editorial style guides like AP and Chicago capitalize the first letter of major words but leave short connecting words, a, an, the, and, or, of, in, lowercase in the middle of a title. This tool doesn't apply that exception: every word, short or long, gets its first letter capitalized, so 'a tale of two cities' becomes 'A Tale Of Two Cities' rather than the conventionally styled 'A Tale of Two Cities'. If you need the small-words convention, check the result and lowercase the connecting words by hand afterward.

Two things to watch

What Title Case does to acronyms and contractions

Because the whole input is lowercased before anything is capitalized, an acronym typed in capitals loses that capitalization. NASA becomes Nasa, and USA becomes Usa, since the tool sees them as ordinary words rather than recognized abbreviations. Check any acronyms in your text after converting and fix them by hand.

Contractions and possessives have their own quirk worth knowing about: because the letter right after an apostrophe also counts as the start of a new word boundary, a word like don't can come out as Don'T rather than Don't, with the letter after the apostrophe capitalized along with the first letter of the whole word. Scan for stray capitals after an apostrophe before you use the result anywhere that's visible to a reader.

The other two modes

UPPERCASE and lowercase: simpler, no exceptions

UPPERCASE and lowercase are more straightforward: every letter in the text is converted the same way, with no word-by-word logic and no exceptions. UPPERCASE is common for headers, labels and acronyms meant to stand out; lowercase is common for normalizing text before a case-insensitive comparison, or for a deliberately understated visual style.

Neither of these two modes has the Title Case quirks above, since there's no first-letter logic involved at all: the whole string is simply converted uniformly, character by character.

Why it matters

What inconsistent casing actually breaks

A username, email address or tag typed in inconsistent case can fail to match itself in a system that treats casing as significant. Headlines and titles pasted from different sources arrive in a mix of styles, sentence case here, all caps there, and reading a page where every heading uses a different convention looks visibly unpolished.

In data work, inconsistent casing across otherwise identical values, 'Product' versus 'product' versus 'PRODUCT', is a common, quiet cause of a group-by or a count returning more categories than there actually are.

Who uses it

Who uses a case converter, and when

Writers and editors converting a batch of headlines or titles to a consistent style before publishing. Developers normalizing user input, tags or labels to one case before storing or comparing them.

It also comes up cleaning up text typed entirely in caps lock by accident, or converting a list of names or headings pasted from a spreadsheet that used inconsistent capitalization throughout.