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Case Converter - UPPERCASE, lowercase, Title Case & Sentence case

Switch the casing of English text between four styles in a single click: UPPERCASE, lowercase, Title Case, and Sentence case.

Change case

Why casing comes up so often

In English, casing is a convention rather than a decoration. Headings and buttons start with a capital letter, while URLs and code identifiers are usually all lowercase. Academic writing follows sentence case, and book or film titles lean on title case. A handful of lines is easy to fix by hand, but at any real volume the rules get surprisingly easy to break.

This tool bundles the four most common styles behind buttons, so a single click does the conversion. The original stays untouched on the left and the result lands in the right-hand box, which makes it easy to compare a few options before you commit.

When to reach for each style

  • UPPERCASE — acronyms (UI, FAQ), bold headlines, button labels
  • lowercase — URL slugs, code identifiers, hashtags
  • Title Case — blog titles, book and film names, section headers
  • Sentence case — ordinary sentences, email body, essays

How to use it

  1. Paste your text into the left box.
  2. Click the conversion you want and the result appears on the right.
  3. Copy Result sends it to the clipboard, and Clear empties both boxes.

Frequently asked questions

Korean, Japanese, and Chinese have no casing, so they come through unchanged. In mixed-language sentences, the English parts are still converted to match the rule you pick, so the tool stays useful when languages are combined.

This tool capitalizes the first letter of every word. It does not apply the editorial rule that short conjunctions and prepositions (a, the, of, in, and so on) stay lowercase, so for strict publication styles like AP or Chicago you may want to tidy the result once more.

No. Every conversion runs in your browser. Nothing you type is uploaded, so sensitive documents are safe to work with here.

It treats the whitespace after a period, exclamation mark, or question mark as a sentence boundary, and it also treats a line break as the start of a new sentence. Periods used in abbreviations (U.S., e.g.) can be mistaken for sentence ends, so it is worth a quick scan of the result.

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