Case Converter
Seven ways to recase text, including proper editorial title case. Nothing you paste leaves your browser.
The seven cases, and when each one is right
| Case | "the lord of the rings" becomes | Use it for |
|---|---|---|
| Sentence case | The lord of the rings | Body copy, form fields, anything pasted in shouting capitals |
| lower case | the lord of the rings | Tags, slugs, email addresses, code identifiers |
| UPPER CASE | THE LORD OF THE RINGS | Short labels, table headers, constants |
| Capitalized Case | The Lord Of The Rings | Names and lists where every word should start with a capital |
| Title Case | The Lord of the Rings | Headlines, page titles, book and article names |
| aLtErNaTiNg | tHe LoRd Of ThE rInGs | Mocking tone in social posts and memes |
| InVeRsE | THE LORD OF THE RINGS becomes the lord of the rings | Undoing a caps-lock accident, flipping existing case |
Title case is not just capitalising every word
This is where most converters get it wrong. Editorial title case capitalises the first and last words of the line no matter what, and capitalises everything else except a short list of articles, coordinating conjunctions and short prepositions. So a, an, the, and, but, or, nor, for, of, in, on, at, to, by, up, as, if, via stay lower case when they fall in the middle. That is why The Lord of the Rings is correct and The Lord Of The Rings is not.
Words after a colon are treated as a fresh start and are capitalised, which matches the way subtitles are set. If a word is already written in full capitals, such as an acronym like NASA or HTML, it is left alone rather than being reduced to Nasa.
The tool bar also carries Fix known acronyms and brand names, which is on by default. With it enabled, a lower-case php comes back as PHP and wordpress as WordPress, which is what a headline needs. Only terms that are never an ordinary English word are on that list, so switching it on cannot damage normal prose, and the checkbox turns it off where you want the text left exactly as typed.
Sentence case and the pronoun problem
Sentence case has to lower-case the line before it can capitalise sentence openings, and that would quietly turn the English pronoun I into i. The converter restores it, including the contractions, so I'm, I'll and I've come back correctly rather than needing a manual pass afterwards.
How to use it
Paste or type into the upper box, then press the case you want. The result appears underneath immediately, and the counts along the bottom update as you go. Copy result puts the converted text on your clipboard, Download .txt saves it as a file, and Use result as input moves the output back up so you can apply a second conversion to it.
Switching between cases always works from your original text rather than from the previous result, so trying title case after upper case gives a proper title, not a line still stuck in capitals.
Worked examples
Fixing text pasted from a PDF in capitals
ANNUAL REPORT FOR THE YEAR ENDING MARCH 2026 becomes Annual report for the year ending March 2026 in sentence case, or Annual Report for the Year Ending March 2026 in title case. Inverse case would also lower it, but it would wrongly lower-case March too, so sentence case is the better choice here.
Preparing a headline
how to migrate a wordpress site to static php in title case becomes How to Migrate a WordPress Site to Static PHP. Note that to and a stay lower case, and that wordpress and php are corrected by the acronym option rather than becoming Wordpress and Php. Turn that option off and the same line returns How to Migrate a Wordpress Site to Static Php.
Questions
What is the difference between title case and capitalized case?
Capitalized case puts a capital on the first letter of every word without exception. Title case follows editorial style: the first and last words are always capitalised, and short words such as a, an, the, of, in, on and to stay lower case in the middle of the line. Compare The Lord Of The Rings with The Lord of the Rings.
Does sentence case know where my sentences end?
Yes. It lower-cases the text, then capitalises the first letter after a full stop, question mark or exclamation mark, and after a line break. The standalone pronoun I is restored, since lower-casing it would be wrong in English.
Is my text uploaded anywhere?
No. The conversion happens inside your browser and there is no backend for this tool. Nothing you paste is sent over the network, logged or stored.
Is there a limit on how much text I can convert?
There is no imposed limit. The practical ceiling is your device memory, and documents of several hundred thousand characters convert without a noticeable pause.
Why did php become PHP and not Php?
The Fix known acronyms and brand names option is on by default, and it corrects terms whose conventional spelling is not what a plain title-case pass produces, such as PHP, WordPress, iPhone and JavaScript. Only terms that are never an ordinary English word are on that list. Clear the checkbox to leave every word exactly as a straight conversion would set it.
Will accented and non-English letters survive?
Yes. Conversion uses the browser Unicode case mapping, so accented Latin, Greek and Cyrillic letters change case correctly, and scripts without letter case such as Arabic or Chinese pass through untouched.
Related: Title Case Converter for headlines only, Sentence Case Converter for body copy, and Word Counter for length checks. Everything else is on the all tools page.
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