Case Converter

What is the Case Converter?

The Case Converter changes the capitalization of your text without making you retype a single word. Drop in a heading you accidentally left in ALL CAPS, a title that needs proper capitalization, or a line stuck entirely in lowercase, and instantly see it rewritten five ways: UPPERCASE, lowercase, Title Case, Sentence case, and aLtErNaTiNg case. This case converter transforms your text instantly in the browser, then lets you copy the result with one tap. It is the fastest way to fix the case of text pulled from emails, spreadsheets, PDFs, or chat, where capitalization rarely arrives the way you actually need it.

Because every conversion runs locally, your text never leaves your device — no upload, no log, no account. That keeps confidential copy (a client name list, an unpublished headline, an internal subject line) on your machine and nowhere else.

How to use it

1. Type into the box, or paste text copied from a document, email, spreadsheet, or web page.
2. All five cases update live as you type — there is no "Convert" button to hunt for.
3. Find the case you want and press its Copy button to grab just that version.
4. Want to try another style? Your original text stays in the box, so pick a different case and copy that one too.

The experience is deliberately one-click, copy, done: open the page, drop in your text, copy the case you need, and move on.

The method behind each case

Only alphabetic letters (A–Z) are ever changed. Spaces, line breaks, punctuation, numbers, and symbols are left exactly where they were, so the structure of your text is preserved. Here is the rule each mode follows:

• UPPERCASE — every letter is mapped to its capital form. Useful for shouting, acronyms, or labels.
• lowercase — every letter is mapped to its small form. Handy for taming text that arrived all in caps.
• Title Case — the first letter of each word is capitalized and the rest are lowercased, which suits headlines and titles.
• Sentence case — only the first letter of the text and the first letter after each sentence-ending mark (. ! ?) is capitalized, matching how ordinary body text reads.
• aLtErNaTiNg case — the case flips letter by letter for a stylized, mocking-meme effect, advancing only on letters so spacing and punctuation stay put.

Examples

• Input "HELLO WORLD" → lowercase → "hello world".
• Input "the lord of the rings" → Title Case → "The Lord Of The Rings".
• Input "this is a test. and another." → Sentence case → "This is a test. And another.".
• Input "stop yelling" → aLtErNaTiNg → "sToP yElLiNg".

Common use cases

• Rescuing ALL-CAPS text that was accidentally typed or pasted with caps lock on.
• Formatting headlines and headings to a consistent Title Case across a document.
• Normalizing names and addresses copied out of a spreadsheet into clean Sentence case.
• Creating stylized aLtErNaTiNg-case text for social posts, captions, and memes.
• Calming down a YELLING email subject line before you forward it on.

Why use this case converter

Plenty of sites can change one case at a time; this one shows all five at once and gives each its own copy button, so you never have to pick a mode, convert, undo, and try again. It is non-destructive by design — your source text stays in the box the whole time, which is exactly what you want when you are comparing how a title looks in Title Case versus Sentence case before committing. And like the rest of this toolkit, the conversion runs entirely in your browser, with no sign-up and no upload.

It pairs naturally with its siblings. After converting, use the Word Counter to confirm length, the Character Counter to check a strict limit, or the Text Formatter to strip stray spaces from the same pasted text.

Frequently asked questions