Case Converter
Convert text to uppercase, lowercase, title case, and more
About Case Converter
Converts text between different capitalization styles — uppercase, lowercase, Title Case, Sentence case, and others — without retyping anything by hand. Useful for fixing text that was pasted in from somewhere with inconsistent capitalization, or matching a specific style requirement for a heading, title, or form field.
Paste your text, select the case style you want, and copy or download the converted result. Each button converts the text you typed, not the previous result, so you can try several styles in a row; "Restore original" brings your text back.
Title Case tools generally lowercase small connecting words (like "a," "the," and "and") automatically — check the result against your specific style guide if you need exact control over which words get capitalized, since different publications and style guides don't always agree on which short words should stay lowercase.
Watch: Case Converter in Action
- Does Title Case capitalize every single word?
- No — Title Case tools generally lowercase small connecting words automatically (like "a," "the," and "and"). Check the result against your specific style guide if you need exact control over which words get capitalized, since guides don't always agree on this.
- Which small words does Title Case leave in lowercase?
- The words a, an, the, and, but, or, for, nor, on, at, to, by, in, of, up and as stay lowercase in the middle of a line. The first and last word of each line are always capitalized, whatever they are.
- Does it keep acronyms like NASA or API?
- Yes, when your text is mixed case: a word already typed as NASA, API or iPhone keeps its capitals in Title Case and Sentence case. If the whole text is in ALL CAPS there is nothing to tell an acronym from a shout, so every word is lowercased first and an acronym needs to be retyped.
- Can I undo a conversion?
- The Restore original button returns the text you had before your first conversion, even if you clicked several styles since. It disappears once you edit the box yourself, so use it before typing anything further.
- What happens to apostrophes in camelCase or snake_case?
- Apostrophes are removed without splitting the word, so fox's becomes foxs. Other punctuation acts as a separator and is dropped, which means a phrase like 'user-id (new)' turns into the three words user, id and new.
- Does it work with accented letters and other alphabets?
- Yes for Title Case, Sentence case and the programming styles, which recognize letters in any script, so a word beginning with an accented letter is capitalized on that first letter. Scripts without upper and lower case are left as they are.
- Is my text uploaded when I convert it?
- No. The conversion runs in your browser, so the text you paste is not sent anywhere and is gone when you close the page.
How to use Case Converter
Type or paste your text into the large box. Then click one of the buttons beneath it: UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg, camelCase, PascalCase, snake_case, kebab-case or CONSTANT_CASE. The converted text replaces what is in the box, and you can click a different style straight away to convert again.
If you dislike the outcome, press Restore original, which brings back the text exactly as you first entered it, even after several conversions in a row. That button disappears as soon as you type or paste something new. Copy sends the current contents of the box to your clipboard. Line breaks are preserved, and Title Case and Sentence case treat each line separately, so a list of headings can be converted in one go.
When to use it
Handy when a spreadsheet export arrives in capitals and needs to read normally, when a headline must be set in title style before publishing, or when a developer wants a variable name from a plain phrase, such as turning 'user account id' into userAccountId or user_account_id. It also repairs text typed with Caps Lock left on.
When not to use it
Do not rely on Sentence case for text full of names, acronyms or product names. It lowercases everything first and then capitalizes only sentence starts, so NASA becomes Nasa. Title Case follows one simple rule for small words, so it will not match a particular style guide such as AP or Chicago. For a handful of words, fixing them by hand is quicker.
Tips for best results
If a headline mixes an acronym with ordinary words, such as 'Visit NYC today', run Title Case on it as it stands. Capitals already inside a mixed-case line are kept, so NYC and iPhone survive. In a line typed wholly in capitals, though, every word is treated as plain text. Names such as McDonald and O'Neil also get their inner capital.
Limitations
Title Case keeps these words lowercase unless they open or close a line: a, an, the, and, but, or, for, nor, on, at, to, by, in, of, up, as. Alternating case starts with a lowercase letter and leaves characters such as the German sharp s unchanged. The programming styles keep only letters and numbers, so symbols are discarded. Each conversion rewrites the box, so the only way back is Restore original.
Privacy
The text you paste is transformed by JavaScript running in your browser tab. It is not uploaded, logged or stored, and nothing remains once you close or reload the page. Copy uses your device's clipboard directly. The only thing the page reports is a usage count naming the tool, sent when you first click a conversion, and it contains none of your text.
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