Case Converter Online – Convert Uppercase, Lowercase, Title Case & Developer Cases
Transform your text across 13 writing and programming case formats with a single click. Whether you are fixing accidental CAPS LOCK paragraphs with Sentence case, formatting blog headlines with editorial Title Case, or converting variable names into camelCase, snake_case, or kebab-case, our converter handles multi-line text and preserves acronyms automatically.
Live All-Cases Instant Preview (First Line)
| Case Format | Live Preview | Action |
|---|---|---|
| Enter text above to preview all 13 case formats simultaneously. | ||
Complete Guide to All 13 Text & Code Case Formats
Compare how each case format transforms the phrase the quick brown fox jumps over 2 lazy dogs:
| Case Format | Example Output | Primary Use Case |
|---|---|---|
| Sentence case | The quick brown fox jumps over 2 lazy dogs. |
Standard paragraphs, emails, body copy, and UI labels |
| Title Case | The Quick Brown Fox Jumps Over 2 Lazy Dogs |
Blog headlines, book titles, academic headers, and news articles |
| Capitalize Words | The Quick Brown Fox Jumps Over 2 Lazy Dogs |
capitalizing every word including short prepositions (In, Of, To) |
| UPPERCASE | THE QUICK BROWN FOX JUMPS OVER 2 LAZY DOGS |
Acronyms, warning banners, legal disclaimers, and headings |
| lowercase | the quick brown fox jumps over 2 lazy dogs |
Normalizing tags, email addresses, and search queries |
| AlTeRnAtInG cAsE | ThE qUiCk BrOwN fOx JuMpS oVeR 2 lAzY dOgS |
Social media memes, playful nicknames, and stylized posts |
| iNVERSE cASE | tHE QUICK BROWN FOX JUMPS OVER 2 LAZY DOGS |
Fixing text typed while CAPS LOCK was accidentally turned on |
| camelCase | theQuickBrownFoxJumpsOver2LazyDogs |
JavaScript, TypeScript, and Java variable & function names |
| PascalCase | TheQuickBrownFoxJumpsOver2LazyDogs |
React components, C# methods, and Object-Oriented class names |
| snake_case | the_quick_brown_fox_jumps_over_2_lazy_dogs |
Python variables, SQL database column names, and file names |
| kebab-case | the-quick-brown-fox-jumps-over-2-lazy-dogs |
URL slugs, CSS class names, and HTML data attributes |
| CONSTANT_CASE | THE_QUICK_BROWN_FOX_JUMPS_OVER_2_LAZY_DOGS |
Environment variables (.env) and global constants |
| dot.case | the.quick.brown.fox.jumps.over.2.lazy.dogs |
Java package namespaces, property keys, and configuration files |
Title Case Minor Words Reference (APA, AP & Chicago Style)
When converting headlines to Title Case, editorial style guides keep short function words in lowercase unless they appear as the first word, the last word, or immediately after a colon:
- Articles:
a,an,the - Coordinating Conjunctions:
and,but,or,nor,for,yet,so - Short Prepositions (3 letters or fewer):
as,at,by,in,of,off,on,out,per,to,up,via
Frequently Asked Questions
What is the difference between Title Case and Capitalize Words?
Capitalize Words (Start Case) capitalizes the first letter of every word regardless of length or grammar (e.g., The Lord Of The Rings). Title Case applies smart editorial rules so articles, conjunctions, and short prepositions stay lowercase unless they begin or end the title (e.g., The Lord of the Rings).
How do I keep acronyms like NASA, CEO, or JSON uppercase when converting to Sentence case?
Make sure the Preserve ALL-CAPS acronyms checkbox is ticked in the right-hand settings column. Any 2-to-6 letter uppercase acronym will remain capitalized while the surrounding sentence is converted to normal sentence case.
Can I convert a list of phrases into snake_case or kebab-case line by line?
Yes! All six developer case converters (camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and dot.case) process your input line by line, so you can batch-convert an entire list of headings or database column names at once.