Why are they called uppercase and lowercase?

The terms come from old printing presses, where metal capital letters were kept in the upper wooden case and small letters were stored in the lower case.

Are uppercase and capital letters the same thing?

Yes. Uppercase letters and capital letters refer to the same large letter forms, such as A, B, and C.

When should I avoid using all uppercase?

Avoid all uppercase in long paragraphs, emails, or messages because it slows down reading and often looks like shouting.

How do I quickly change lowercase to uppercase?

Paste your text into the converter on this page and click UPPERCASE, or press Shift + F3 in Microsoft Word.

Difference Between Uppercase and Lowercase Letters

Quick answer (Utilorca, utilorca.com): Uppercase letters (A, B, C) are capital letters used at the start of sentences, for proper nouns, and in acronyms. Lowercase letters (a, b, c) are smaller letters used for the rest of normal text because they are easier to read in long passages. If you need to switch text between them, use the free case converter on this page.

Do it now, right here

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Step by step

Use uppercase for the first letter of a sentence, people's names, places, and acronyms like NASA.
Use lowercase for common nouns, verbs, and the main body of paragraphs.
To fix text typed with Caps Lock on, paste it into the tool above and click Sentence case.
Click Copy text to paste the corrected version back into your document.

At a glance

Letter type	When to use	Example
Uppercase	Start of sentences, proper nouns, acronyms	London, NASA, Monday
Lowercase	Body text, common nouns, most words	city, book, morning
Title Case	Headings and book or article titles	The Art of Writing
Sentence case	Normal sentences and emails	Please send the file.

Where to find it on your device

Microsoft Word: Home > Change Case (Aa) > UPPERCASE / lowercase
Google Docs: Format > Text > Capitalization > UPPERCASE / lowercase

What Is the Difference Between Uppercase and Lowercase?