How to use the Case Converter
- Paste your text into the top box.
- Choose a case. The result appears immediately in the lower box. Switch between cases as often as you like — your original text is not changed.
- Copy or download the result. If you want to keep converting the converted version, use Replace input with result.
What each case does
| Case | Example output | Typical use |
|---|---|---|
| UPPERCASE | MONTHLY SALES REPORT | Short labels, acronyms, warnings |
| lowercase | monthly sales report | Tags, email addresses, fixing caps lock |
| Title Case | A Guide to the Monthly Sales Report | Headlines, book and article titles |
| Sentence case | A guide to the monthly sales report | Body text, UI labels, many modern headings |
| Capitalized Case | A Guide To The Monthly Sales Report | Names lists, some product listings |
| camelCase | monthlySalesReport | JavaScript and Java variable names |
| snake_case | monthly_sales_report | Python variables, database columns |
| kebab-case | monthly-sales-report | URLs, CSS classes, file names |
How the conversions work
Title Case vs Capitalized Case
These two look similar but follow different rules. Capitalized Case simply capitalises the first letter of every word. Title Case follows the convention used by most English style guides: important words are capitalised, while short articles, conjunctions and prepositions — a, an, the, and, but, or, nor, for, of, in, on, at, to, by, as, up, via — stay lowercase unless they are the first or last word, or follow a colon.
So "the lord of the rings: the return of the king" becomes The Lord of the Rings: The Return of the King in Title Case, but The Lord Of The Rings: The Return Of The King in Capitalized Case. Style guides such as AP, Chicago and APA differ on a few details (for example, whether to capitalise prepositions of four or more letters), so give important headlines a final read.
Sentence case
Sentence case lowercases the text, then capitalises the first letter of each sentence and the standalone word I. It cannot know which other words are proper nouns — london or microsoft will come out lowercase — so check names afterwards.
Programming cases
camelCase, snake_case and kebab-case first split the text into words. Spaces, punctuation, underscores and hyphens all act as separators, and an existing camelCase boundary such as salesReport is also recognised. Accents are kept, but punctuation is removed, because most programming languages and URLs do not allow it in identifiers.
Examples
"pLEASE SEND THE FILES BY fRIDAY" → Sentence case → Please send the files by friday. Capitalise Friday by hand — days of the week are proper nouns.
"Total order value (USD)" → camelCase → totalOrderValueUsd; snake_case → total_order_value_usd.
Tips
- For web addresses, the Slug Generator is a better choice than kebab-case because it also removes accents and optional filler words.
- Converting a list? Clean it with Remove Extra Spaces first, then sort it with the Text Sorter.
- Changing case does not change the number of letters, but it can change how easy a heading is to read. Long headlines in UPPERCASE are noticeably slower to read than sentence case.
- After converting, the Word Counter can confirm your heading or text still fits its length limit.
Frequently asked questions
What is the difference between Title Case and Capitalized Case?
Capitalized Case capitalises every word. Title Case keeps short words like of, the and and lowercase unless they start or end the title, which is the standard for headlines and book titles.
Why did Sentence case lowercase a name?
The converter cannot tell a proper noun from an ordinary word, so names, places and brands come out lowercase in Sentence case. Re-capitalise them after converting.
Does the converter work with accented letters?
Yes. Letters such as é, ñ and ü are converted correctly between upper and lower case. The programming cases keep accented letters; use the Slug Generator if you need plain ASCII.
Is there a limit on text length?
No fixed limit. Conversion happens in your browser, so even long documents convert almost instantly.
Last updated . Spotted a mistake? Let us know and we will correct it.