Everyday Tools
Text Case Converter
Paste any text and switch it between uppercase, lowercase, title case, and sentence case, then copy the result.
Calculation inputs
Type or paste your text, then choose a case style.
Results
Converted text
The Quick Brown Fox Jumps Over the Lazy Dog. It Was a Good Day.
Style applied
Title Case
Words
14
- Characters
- 63
- Characters without spaces
- 50
- Lines
- 1
About this calculator
This tool switches text between UPPERCASE, lowercase, Title Case, and Sentence case with one click. Writers, students, and anyone cleaning up pasted text use it to quickly fix inconsistent capitalization.
How it works
- UPPERCASE and lowercase convert every letter
- Title Case capitalises each word, leaving short joining words such as 'of' and 'the' lowercase unless they are first or last
- Sentence case lowercases everything, then capitalises the first letter after each full stop, question mark, or exclamation mark
Notes and assumptions
Conversion happens in your browser as you type — nothing is uploaded.
Title case rules vary by style guide, so proper nouns and acronyms may still need a manual fix.
How it works in plain English
UPPERCASE and lowercase are the simplest conversions: every letter in the text is changed to the same case, regardless of position or word. These are useful for headers, acronyms, or normalizing text before further processing.
Title Case capitalizes the first letter of each major word, which is the style used for headlines and titles. Short connecting words such as 'a,' 'of,' 'the,' and 'and' are kept lowercase unless they fall at the very start or end of the text, matching common style-guide conventions for headline capitalization.
Sentence case lowercases the entire passage first, then capitalizes only the first letter of each sentence — after a period, question mark, or exclamation mark, as well as at the very start of the text. This mimics how sentences are naturally capitalized in normal writing, correcting text that was typed in all caps or with erratic capitalization throughout.
Worked example
Starting with the text 'the quick brown fox jumps over the lazy dog. it was a good day.', UPPERCASE produces 'THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG. IT WAS A GOOD DAY.' Title Case produces 'The Quick Brown Fox Jumps Over the Lazy Dog. It Was a Good Day.', keeping 'over' and 'a' lowercase since they are short connecting words in the middle of the sentence. Sentence case produces 'The quick brown fox jumps over the lazy dog. It was a good day.', capitalizing only the first letter of each of the two sentences.
Common capitalization style conventions
| Style | Rule | Example |
|---|---|---|
| UPPERCASE | Every letter capitalized | HELLO WORLD |
| lowercase | No letters capitalized | hello world |
| Title Case | Major words capitalized, short joining words lowercase | A Tale of Two Cities |
| Sentence case | Only the first letter of each sentence capitalized | Hello world. How are you? |
Conventions follow widely used style-guide practices; some guides vary on capitalizing prepositions.
Frequently asked questions
Does Title Case always follow the same rules everywhere?
No. Different style guides — APA, Chicago, AP, and others — disagree slightly on which short words stay lowercase and how long a word needs to be before it gets capitalized. This tool follows a common general convention, but publications with a specific house style may want manual adjustments afterward.
Will this fix capitalization of proper nouns and acronyms?
Not reliably. Because the converter cannot tell a proper noun or acronym from an ordinary word, Title Case and Sentence case may lowercase names, brands, or abbreviations that should stay capitalized, such as 'NASA' or 'iPhone.' A quick manual check after converting is a good idea.
Is my text uploaded anywhere when I use this tool?
No. The conversion happens entirely within your browser as you type or paste, and nothing is sent to a server. You can safely paste sensitive or private text, since it never leaves your device during the conversion process.
Why did Sentence case not capitalize a word after a colon or semicolon?
Sentence case capitalizes letters that follow a period, question mark, or exclamation mark, along with the very first letter of the text. Colons and semicolons are not treated as sentence endings, so text after them stays lowercase unless it happens to start a new sentence on its own.
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