Text Transformation: Lowercase to Uppercase
A lowercase to uppercase converter changes text from small letters to capitals without retyping it. Paste, click, copy. The converter below does it on this page; the full tool on our home page adds eight more styles including camelCase and snake_case.
What each button does
| Button | Input | Output |
|---|---|---|
| UPPERCASE | the ceo of nasa won | THE CEO OF NASA WON |
| lowercase | THE CEO OF NASA WON | the ceo of nasa won |
| Title Case | the lord of the rings | The Lord of the Rings |
| Sentence case | the CEO won. we start monday | The CEO won. We start monday |
Two details in that table are worth pointing out, because most converters get them wrong. Title Case leaves of and the second the in lowercase, as the style guides require. And Sentence case keeps CEO in capitals instead of flattening it to ceo.
When you need a converter at all
| Situation | Why retyping is the wrong answer |
|---|---|
| A document arrived in ALL CAPS | Reading it is slow and retyping a page is minutes of work |
| Caps Lock was on for a paragraph | The text is fine, only the case is wrong |
| Names imported in the wrong case | MARIA GONZALEZ in a letter looks shouted |
| Headings inconsistent across a document | Converting is faster than editing each one |
| A variable name needs a different convention | camelCase to snake_case is mechanical |
| Copy for a button or a label | Sentence case is the modern standard |
The alternatives, and their limits
| Tool | Method | Limit |
|---|---|---|
| Microsoft Word | Shift + F3, or Home > Aa | Destroys acronyms in Sentence case |
| Google Docs | Format > Text > Capitalization | Same acronym problem |
| Excel | =UPPER(A1), =LOWER(A1), =PROPER(A1) | No sentence case at all |
| Notepad++ | Edit > Convert Case To | Windows only |
| Python | text.upper() | Requires writing code |
| Online converter | Paste and click | Needs a browser |
The step-by-step procedures are in changing lowercase to uppercase in Word, the same job in Excel and in Python.
What separates a good converter from a bad one
- Acronyms survive. NASA, HTML and CEO stay in capitals through Sentence case and Title Case.
- Abbreviations do not trigger a new sentence. we meet at 3 p.m. today should not become 3 p.m. Today.
- Decimals and domains are left alone. 3.50 dollars and google.com contain full stops that do not end sentences.
- Title Case follows a style guide. Short articles, conjunctions and prepositions stay lowercase — the list is in words that are not capitalized in titles.
- Nothing is uploaded. Conversion should happen in your browser, so the text never leaves your device.
The twelve styles on the main tool
| Style | Example |
|---|---|
| UPPERCASE | THE QUICK BROWN FOX |
| lowercase | the quick brown fox |
| Sentence case | The quick brown fox |
| Title Case | The Quick Brown Fox |
| Proper Case | The Quick Brown Fox |
| aLtErNaTiNg | ThE QuIcK BrOwN FoX |
| tOGGLE cASE | tHE qUICK bROWN fOX |
| camelCase | theQuickBrownFox |
| PascalCase | TheQuickBrownFox |
| snake_case | the_quick_brown_fox |
| kebab-case | the-quick-brown-fox |
| CONSTANT_CASE | THE_QUICK_BROWN_FOX |
All twelve, plus a live word and character count. Open the upper lower case converter. Everything runs in your browser, nothing is uploaded, and there is no sign-up or limit.
Frequently asked questions
How do I convert lowercase to uppercase?
Paste the text into the converter above and click UPPERCASE, then copy the result. In Word, select the text and press Shift + F3. In Excel, use =UPPER(A1).
Is the converter free?
Yes, with no sign-up and no limit on how much text you convert.
Does my text get uploaded anywhere?
No. The conversion runs in your browser, so the text never leaves your device.
Will it keep acronyms like NASA in capitals?
Yes. Sentence case and Title Case both detect all-capital words and leave them alone, which built-in tools such as Word do not.
What is the difference between Title Case and Proper Case?
Proper Case capitalizes the first letter of every word. Title Case leaves short articles, conjunctions and prepositions lowercase, so The Lord of the Rings rather than The Lord Of The Rings.
Can I convert text on my phone?
Yes. The converter works in any mobile browser, and the buttons are laid out for a small screen.
Is there a limit on how much text I can convert?
No. Paste a paragraph or a whole document; the conversion runs locally, so size is limited only by your browser.
Can it produce camelCase and snake_case?
The converter on the home page does, along with PascalCase, kebab-case and CONSTANT_CASE. The one on this page covers the four writing styles.
The short version
Paste, click, copy. Use the box above for a quick UPPERCASE, lowercase, Title Case or Sentence case conversion, and the main converter when you need the programming styles too. Whatever tool you use, check that it keeps acronyms intact and does not capitalize after p.m. — those two behaviors separate a correct converter from a naive one.