Case Converter
Free case converter: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more. Instant, private, no sign-up.
The 10-second test: switch off your Wi-Fi (or turn on airplane mode) and use this tool anyway. It keeps working — because there is no server doing the work.
The technical check: open your browser's developer tools, go to the Network tab, and run the tool. Your file is never sent anywhere.
Measured live on this page — files transmitted: 0 · file data sent: 0 bytes
This counter hooks the browser's own networking functions, so it would rise the instant any file data left this page. The only thing this site ever transmits is the contact form, if you choose to send one.
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or drag & drop — pasting works too (Ctrl+V)
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How to change the case of your text
Paste your text, click the style you want, and copy the result. Ten formats are supported, including the programming conventions people usually have to do by hand: camelCase, PascalCase, snake_case and kebab-case.
Everything happens in your browser, so whatever you paste - notes, code, client copy - stays on your device.
The programming conventions, explained
camelCase starts lowercase and capitalises each following word — userName. Standard in JavaScript and Java for variables. PascalCase capitalises the first word too — UserName — and is used for class names. snake_case joins words with underscores — user_name — and is the Python and SQL convention. kebab-case uses hyphens — user-name — and is what URLs and CSS class names use. Converting between them by hand is tedious and error-prone, which is the main reason this tool exists.
Title Case versus Sentence case
Title Case capitalises every word: Great Ideas For Monday. Sentence case capitalises only the first word of each sentence: Great ideas for monday. Note that neither knows which words are proper nouns, so a name in the middle of a sentence will need fixing by hand after converting to sentence case.
Fixing text typed with caps lock on
Paste it and choose Sentence case. That handles the sentence starts correctly, which lowercase alone does not.
Nothing is uploaded
Conversion happens as you click, in your browser. Client copy, unpublished writing and code all stay on your machine.
Frequently asked questions
What is the difference between Title Case and Sentence case?
Title Case capitalises every word (Great Ideas For Monday). Sentence case capitalises only the first word of each sentence (Great ideas for monday).
Can it fix text typed with caps lock on?
Yes - paste it and choose Sentence case or lowercase to fix it instantly.
Is there a length limit?
No practical limit. Very long documents may take a moment because your own device does the work.