Case Converter

Most case converters make you pick one button, then quietly rewrite the text you just pasted. Click UPPERCASE and your original is gone. Curious how the same line reads in Title Case? Now you are stacking buttons and getting nonsense, because the tool converted the all-caps version instead of your actual words. What you typed is never overwritten here. You type or paste once, and every case fills in at the same time, each in its own box: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and the rest. Nothing you typed gets overwritten, you copy the one you meant and move on.

That side-by-side view is the whole point. When you can see Title Case and Sentence case and Capitalize Each Word sitting next to each other, you stop guessing which one your headline needs and just read them. Thirteen formats in all, split into everyday writing cases and the programming ones, with a Copy button on every box and a Copy all button when you want the entire set as a labeled list. It runs entirely in your browser, so a private draft or a client's unpublished copy is never uploaded and never leaves your machine.

There is also a live count bar under the grid tracking words, characters, and reading time, so a word count and a case converter sit in one tab instead of two.

1. Add your text. Type it, paste it, drop a .txt file straight onto the box, or use Choose a text file to pick one. A whole article works as well as a single word.
2. Read down the grid. Every case is already filled in from what you typed and updates on every keystroke, so there is no convert button to hunt for.
3. Set a title style if you need one. The Standard, AP, and Chicago buttons change how Title Case treats the small joining words. More on that below.
4. Copy what you want. Hit Copy on any single case, or Copy all to grab every format at once as a labeled list you can paste into a doc.
5. Clear to start fresh, or just select the box and retype.

Because nothing is destructive, you never lose your starting text. Convert a paragraph, copy the snake_case version for a variable, then copy the Title Case version for the heading, all from the same paste.

Here is where cheap converters fall down. Ask most of them for Title Case and they capitalize every word on the line, little ones included, and hand you The Catcher In The Rye, which is not how a title is actually written. Real title case keeps the short joining words lowercase in the middle, the articles like a and the, the short conjunctions like and and but, the little prepositions like in and of, while always capitalizing the first and last word no matter what they are. So it is The Catcher in the Rye, with in and the left down because they are buried in the middle.

The gray area is the longer words, and the two big style guides disagree, so this tool lets you pick which one to follow.

• Standard uses a sensible built-in list of common short words and suits most web headings and everyday titles.
• AP style, the one newsrooms follow, capitalizes any preposition or conjunction of four letters or more. Under AP you get Notes From the Editor, with From standing up because it runs to four letters.
• Chicago style, the one books lean on, keeps every preposition lowercase whatever its length. The same idea under Chicago reads Secrets within the Team, with within left down even at six letters.

Switch between the three and watch the Title Case box rewrite itself. For a whole site, settle on one guide and hold it across every heading so they match each other. And a warning on how the raise works: Title Case, Sentence case, and Capitalize Each Word all lowercase your text first and then decide what to lift back up. An all-caps acronym like NASA comes back as Nasa, and a name with a deliberate capital in the middle only keeps it when the rule happens to land there. That is fine for ordinary prose, though text full of intentional capitals will need a few manual fixes.

camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, and dot.case turn a few readable words into a valid identifier or slug. They strip out anything that is not allowed, the commas and apostrophes and stray symbols, so what you copy drops straight into code or an address bar. CONSTANT_CASE is the all-caps-with-underscores form most languages use for constants, and it has its own button now instead of a two-step chain. PascalCase capitalizes the first word too, which is what most languages want for a class or type name, while camelCase leaves the first word small for a plain variable.

The one thing to know is how the tool finds your words, it splits on spaces. Feed it hello world and snake_case gives you back hello_world, clean. Feed it something already glued together like helloWorld with no space in it, and the tool cannot see where one word stops and the next starts, so it treats the whole run as a single word and returns helloworld. If you are moving from one code style into another, put spaces between the words first, then read off the case you want.

For URLs, reach for kebab-case rather than snake_case. Google's own URL structure guidance recommends hyphens, because it reads a hyphen as a break between words while an underscore can join them. So /my-blue-widget/ reads as three words and /my_blue_widget/ risks reading as one, and the hyphen version is the one search can match to a query.