Text Case Converter
Paste your text below and convert it to any common case format instantly.
| Case Style | Example: "the quick brown fox" |
|---|---|
| UPPERCASE | THE QUICK BROWN FOX |
| lowercase | the quick brown fox |
| Title Case | The Quick Brown Fox |
| Sentence case | The quick brown fox |
| camelCase | theQuickBrownFox |
| snake_case | the_quick_brown_fox |
FAQ
What is title case?
Title case capitalizes the first letter of each major word, typically used for headlines and titles — for example, 'the quick brown fox' becomes 'The Quick Brown Fox'.
What is sentence case?
Sentence case capitalizes only the first letter of the first word (and proper nouns), the way a normal sentence is written — 'THE QUICK BROWN FOX' becomes 'The quick brown fox.'
What are camelCase and snake_case used for?
These are naming conventions used in programming. camelCase joins words with no spaces and capitalizes each word after the first (myVariableName), while snake_case joins words with underscores in all lowercase (my_variable_name).
Does this tool store or upload my text?
No — all conversion happens directly in your browser. Nothing you type or paste is sent anywhere or saved.
How does each case style transform the same sentence?
See the table above for a side-by-side comparison of all six case styles applied to the same example sentence.
If I convert to lowercase and then back to UPPERCASE, do I get my original text back?
No — converting case is a one-way operation. Once the original capitalization pattern is discarded (for example, converting 'McDonald' to lowercase gives 'mcdonald'), converting back to uppercase or another case can't restore the original mixed-case spelling.
Which case style should I use for a filename or a URL slug?
snake_case or a hyphenated lowercase style is the most common choice for filenames and URL slugs, since spaces and mixed case can cause issues in web addresses. camelCase is more common for variable names in code.
About this tool
This tool converts text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, and snake_case. Useful for cleaning up pasted text, preparing headlines, or formatting variable names for code. Everything runs in your browser — nothing is stored or sent anywhere.