Free writing & formatting tool
Case Converter
Paste your text and switch it to sentence case, title case, upper, lower, or any of the developer casings in one click. Title case follows real AP, Chicago, and APA rules instead of blindly capitalising every word.
- 16 conversions
- Real style-guide title case
- Undo any step
- Nothing leaves your browser
- Characters 0
- No spaces 0
- Words 0
- Sentences 0
- Lines 0
- Read time 0s
Standard cases
Developer cases
Clean-up
Why this case converter gets title case right
Nearly every case converter online treats title case as “capitalise the first letter of every word”. No style guide has ever said that. It is the reason so many headlines online read The Art Of War instead of The Art of War.
Three real style guides
Switch between AP, Chicago, and APA and the output changes accordingly, because the three disagree about prepositions and about how long a word has to be before it gets capitalised.
Acronyms survive
Words already written in full capitals, such as NASA, PDF, or API, are left alone rather than being flattened into Nasa and Pdf like most converters do.
Six developer casings
camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and dot.case, each splitting correctly on existing camel boundaries as well as on spaces and punctuation.
Undo, so experimenting is free
Every conversion is stacked, so you can try five in a row and step back through them. Most converters overwrite your text with no way back.
Live counts as you type
Characters, words, sentences, lines, and reading time update live, so you do not need a second tab open to check whether the headline fits.
Your text stays yours
Everything runs locally in the page. Nothing is uploaded, logged, or sent to a server, which matters if you are pasting anything you would not post publicly.
Every case type, with an example
The same phrase converted every way the tool supports, so you can see at a glance which one you actually want.
| Case | Example | Typically used for |
|---|---|---|
| Sentence case | The art of war | Body copy, UI labels, most modern headlines |
| lower case | the art of war | Tags, slugs, deliberately informal branding |
| UPPER CASE | THE ART OF WAR | Short labels, buttons, emphasis in short bursts |
| Title Case | The Art of War | Headlines and titles under AP, Chicago, or APA |
| Capitalise Each Word | The Art Of War | Names, columns, form fields — not real title case |
| aLtErNaTiNg cAsE | tHe ArT oF wAr | Sarcasm online, and very little else |
| camelCase | theArtOfWar | Variables and functions in JavaScript and Java |
| PascalCase | TheArtOfWar | Class and component names, C# methods |
| snake_case | the_art_of_war | Python variables, database columns |
| kebab-case | the-art-of-war | URL slugs, CSS classes, file names |
| CONSTANT_CASE | THE_ART_OF_WAR | Constants and environment variables |
| dot.case | the.art.of.war | Config keys, namespaces, analytics events |
How the three title case styles differ
All three capitalise the first and last word and lowercase articles. They part ways over prepositions, which is where most of the disagreement in published headlines comes from.
AP style
Used by most newsrooms. Lowercases articles, coordinating conjunctions, and prepositions of three letters or fewer. Prepositions of four letters or more are capitalised, so you get Walking Through the Fire.
Chicago style
Used in books and long-form publishing. Lowercases all prepositions regardless of length, plus as and the infinitive to. The same headline becomes Walking through the Fire.
APA style
Used in academic writing. Capitalises every major word of four letters or more, and lowercases only short articles, conjunctions, and prepositions of three letters or fewer.
When it does not matter
If you have no house style, pick one and stay consistent. Sentence case is increasingly the default for web headlines anyway, and it sidesteps the whole argument.
Where a case converter actually saves time
Retyping a sentence to fix its capitalisation is one of those small tasks that costs thirty seconds and breaks your concentration for five minutes.
Rescuing text typed with caps lock on
A paragraph in shouting capitals goes back to sentence case in one click, with the sentence boundaries detected for you.
Making headlines match a style guide
Editors and content teams working to AP or Chicago can normalise a batch of headings without arguing about prepositions each time.
Turning labels into code identifiers
A column heading becomes
snake_casefor a database, orkebab-casefor a URL slug, without hand-editing every space.Cleaning text pasted from a PDF
The clean-up buttons collapse doubled spaces and strip the line breaks that PDFs insert at the end of every visual line.
Checking a headline fits
The live character count tells you immediately whether a title will be truncated in search results or in a social preview.
Normalising imported spreadsheet data
Names and addresses arriving in inconsistent capitalisation can be standardised before they reach a mail merge.
Case converter FAQ
What is the difference between title case and capitalising each word?
Capitalising each word capitalises everything, including articles and prepositions, giving you The Art Of War. Real title case follows a style guide and leaves minor words lowercase unless they are the first or last word, giving you The Art of War.
Both options are available here because the naive version is genuinely useful for things like name fields and spreadsheet columns, where style guides do not apply. For headlines, use title case.
How do I change text from uppercase to lowercase?
Paste the text into the box and press the lower case button. Every character becomes lowercase immediately.
If the text was typed with caps lock on and you want it readable again, sentence case is usually the better choice: it lowercases everything and then restores the capital letter at the start of each sentence.
Does sentence case handle multiple sentences?
Yes. It lowercases the whole passage, then capitalises the first letter after each full stop, question mark, or exclamation mark, and after each line break. The standalone pronoun I is also restored.
Abbreviations containing full stops are the one place any automated sentence case can be fooled, so give the result a quick read if your text is full of them.
Will my acronyms be ruined?
Not in title case or capitalise-each-word. Words written entirely in capitals with two or more letters are recognised as acronyms and passed through untouched, so NASA stays NASA rather than becoming Nasa.
The lower case and UPPER CASE buttons do exactly what they say and will convert everything, acronyms included, because that is the point of those two.
What is camelCase and when should I use it?
camelCase removes the spaces and capitalises the first letter of every word except the first, producing theArtOfWar. It is the standard convention for variables and functions in JavaScript, Java, and Swift.
PascalCase is the same thing with the first word capitalised too, and is normally reserved for classes, types, and component names.
Is my text sent anywhere?
No. Every conversion runs in JavaScript inside your own browser. Nothing is uploaded, stored, or logged, and closing the tab discards it entirely.
That is worth knowing if you are formatting anything confidential, since a number of online text tools do post your content to a server to process it.
Can I undo a conversion?
Yes. Each conversion is saved to a history stack, so the undo button steps back through them one at a time, up to the last fifty changes.
Because some conversions discard information, undo is the only way back. Once text has been lowercased, the original capitals cannot be reconstructed by any other means.
Which title case style should I choose?
Use AP if you are writing anything journalistic or web-facing, Chicago for books and long-form publishing, and APA for academic work. The practical difference is mainly how they treat prepositions of four or more letters.
If no house style applies, the only thing that really matters is consistency across your site or document. Picking one and sticking to it beats getting the theory right.
Fix the capitalisation and get back to writing
Retyping a headline to change its capitalisation is the kind of small friction that quietly eats an afternoon. Paste the text, pick a case, copy it back out. The whole thing takes about four seconds and nothing you paste ever leaves the page.