How to Change Text Case (Uppercase, Lowercase, Title Case)

Change text case without retyping a word

You pasted a heading in ALL CAPS, a name typed in lowercase, or a title where half the words are capitalized and half aren't. Retyping it is tedious, and your word processor's case menu is usually buried and limited to two or three options. A dedicated case converter fixes the whole block in one click.

This guide shows you how to switch text between uppercase, lowercase, title case, and sentence case, plus a few programmer-friendly formats like snake_case and camelCase. The text case changer runs entirely in your browser, so your text never leaves your device, there's nothing to install, and no sign-up. It's handy for cleaning up headlines, fixing a CSV column, formatting variable names, or just calming down a message that arrived in shouty caps.

How to change text case

Open the text case changer. You'll land on the Converter tab with an input box on the left and a converted-text box on the right.
Paste or type your text into the Original Text box. You can also click the upload icon to load a .txt or .md file directly. The tool processes it locally — nothing is sent anywhere.
Pick a case from the Select Case panel. Under Text Cases you'll find the everyday options:
- UPPERCASE — turns everything into capitals (HELLO WORLD).
- lowercase — drops everything to small letters (hello world).
- Title Case — capitalizes each main word (Hello World).
- Smart Title (AP) — title case that keeps short words like "a," "of," and "the" lowercase, the way headlines are styled (The Art of War).
- Sentence case — capitalizes only the first letter of each sentence (Hello world. This is text.).
Watch the Converted Text box update instantly as you choose a case. There's no "convert" button to press — selecting a case applies it live.
Click the copy icon above the output to put the result on your clipboard, or the download icon to save it as a .txt file. Done.

That's the core workflow. The sections below cover the extra modes when you need more than a straight conversion.

Compare every case at once

Not sure which style fits? Switch to the Preview All tab, paste your text once, and you'll see all 19 conversions side by side. Each row has its own copy button, so you can grab the exact format you want without flipping back and forth.

Convert only certain words

The Find & Replace tab applies a case change to specific words only. Type the word or phrase to match, choose the case to apply, and the tool rewrites just those matches while leaving the rest of your text untouched — useful for forcing a brand name or acronym into a fixed style.

Process many lines separately

If you have a list — names, tags, slugs — use the Batch tab. Set a delimiter (use \n for one item per line, or any character) and the tool converts each segment on its own. You can then copy all results or download them together.

Programmer cases

Switch the case category to Programming to convert a phrase into camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, or Header-Case. The tool detects word boundaries automatically, so "user profile name" and "userProfileName" both convert cleanly. CONSTANT_CASE is the usual style for environment variables.

Tips

Title Case vs Smart Title. Plain Title Case capitalizes nearly every word. Smart Title (AP) follows headline style and leaves articles and short prepositions lowercase. For blog titles and headlines, Smart Title usually looks more natural.
Lock acronyms with Custom Rules. On the Custom Rules tab you can force words like "api" to always render as "API" or "url" as "URL," no matter which case you apply. The rule runs after the main conversion, so it survives an UPPERCASE or lowercase pass.
Undo is built in. If you paste the wrong block or pick the wrong case, the undo and redo arrows above the input box step you back without losing earlier text.
Check the counts. A small stats strip shows characters, words, sentences, and the number of upper- vs lowercase letters. Quick sanity check after a conversion. For deeper analysis, the text statistics tool breaks down readability and word frequency.

Common problems

Sentence case missed a sentence. Sentence case capitalizes the first letter after ., !, or ?. If a line break wasn't preceded by one of those, it may not start with a capital. Add the punctuation, or fix that letter by hand.
Title Case capitalized a word I wanted lowercase. Plain Title Case is broad. Switch to Smart Title (AP) for headline-style rules, or use a Custom Rule to pin a specific word.
Programmer case merged unexpected words. The converter splits on spaces, hyphens, underscores, and case transitions. If a phrase has stray punctuation, clean it first — the whitespace remover and text cleaner strip extra spaces and odd characters so the boundaries land where you expect.

FAQ

Does my text get uploaded anywhere? No. The case changer runs in your browser, so the text you paste stays on your device. There's no account and nothing to install.

What's the difference between Title Case and Capitalize Words? Both capitalize the start of words, but Title Case applies optional rules around small words, while "Capitalize Words" simply uppercases the first letter of every word with no exceptions. Use Preview All to see them compared on your own text.

Can I convert a long document or a whole file? Yes. Paste the full text, or use the upload button to load a .txt or .md file. The conversion happens instantly and you can download the result as a text file.

How do I count words after fixing the case? Paste the converted output into the word counter for a quick word and character total, or use text statistics for a fuller breakdown.

Cleaning up text? Pair the case changer with the text cleaner and word counter to tidy and measure your content in one sitting.