Case converter

Case converter

What the case converter does

This app converts text between three cases: Title Case, capitalizing the first letter of every word; UPPERCASE, capitalizing everything; and lowercase, capitalizing nothing. Paste in text with a mix of casing, pick the one you want, and get back a version converted consistently across the whole thing.

It's local. Conversion runs entirely in your browser, nothing you paste is uploaded, and there's no limit on how much you convert or how often you're back.

That's a real feature here, not a footnote, since case conversion often runs on user-entered names, labels or tags on the way into a form or a database, and a tool doing that shouldn't need a round trip to a server to flip a letter's capitalization.

Workflow

How to convert text case in three steps

One decision to make, nothing else to set up.

Step 1

Paste your text into the box.

Step 2

Pick Title Case, UPPERCASE or lowercase.

Step 3

Copy the converted result out.

The exact rule

How Title Case works here, precisely

This converter lowercases the whole input first, then capitalizes the first letter of every word it finds. It's a consistent rule, and worth understanding exactly, because it isn't the same rule an editorial style guide typically uses.

AP and Chicago style both capitalize major words but keep short connecting words, a, an, the, and, or, of, in, lowercase in the middle of a title. This app doesn't apply that distinction: every word gets its first letter capitalized regardless of length, 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 small-word styling, check the output and lowercase the connectors by hand.

Two things to watch for

What Title Case does to acronyms and contractions

Because everything gets lowercased before anything gets capitalized, an acronym typed in all caps loses its capitalization here. NASA becomes Nasa, USA becomes Usa, treated as ordinary words rather than recognized abbreviations. Check any acronyms in your text after converting and fix them manually.

Contractions have their own quirk that's genuinely worth flagging: since the letter right after an apostrophe also counts as the start of a new word under this rule, a word like don't can come out as Don'T, with the letter after the apostrophe capitalized right along with the word's actual first letter. Scan for stray capitals after an apostrophe before using the result anywhere a reader will see it.

The other two modes

UPPERCASE and lowercase: no word-by-word logic, no quirks

UPPERCASE and lowercase are more straightforward than Title Case: every letter in the text is converted uniformly, with no per-word logic at all. UPPERCASE suits headers, labels and acronyms meant to stand out; lowercase suits normalizing text before a case-insensitive comparison, or a deliberately understated style choice.

Neither carries the Title Case quirks above, since there's no first-letter detection involved, just a full, uniform conversion across every character.

Why it matters

What inconsistent casing actually breaks

A username, tag or email typed in inconsistent case can fail to match itself in a system that treats casing as significant. Headlines pasted in from different sources arrive in a jumble of styles, sentence case in one spot, all caps in another, and a page where every heading follows a different convention just looks unpolished.

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

Who it's for

Who uses a case converter, and when

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

It's also the fastest fix for text typed entirely in caps lock by accident, or a list of names pulled from a spreadsheet where capitalization was never consistent to begin with.