Case Converter

The Case Converter tool changes the capitalisation of your text in one click — to UPPERCASE, lowercase, Title Case, Sentence case, and more. Conversion runs in your browser, so your text stays private.

Quickly fix accidentally typed caps, prepare headlines, or normalise data imported from another source without retyping anything.

Case conversion is one of those small fixes that turns up constantly in real work. A headline typed in all caps by accident, a CSV import where every name is uppercase, a code snippet pasted in the wrong case, or a social post that needs sentence case for readability — each takes a single click instead of a manual retype. The tool handles uppercase, lowercase, title case, sentence case, and alternating case so you can match any style requirement.

Title case capitalises the first letter of every word, which suits headlines and book titles, while sentence case capitalises only the first letter of each sentence, which suits body text and descriptions. Alternating case mixes upper and lower letters in an alternating pattern, sometimes used for stylistic or meme text. Line breaks and paragraph spacing are preserved through every conversion so your document structure stays intact.

Case conversion runs entirely in your browser using native JavaScript string methods. When you paste text and choose a case style, the tool applies the standard toUpperCase and toLowerCase transforms, with additional logic for title case (capitalising the first letter of each word) and sentence case (capitalising the first letter after each sentence-ending punctuation). No text is sent to a server.

Your text never leaves your device — there is no upload, no server-side processing, and no copy retained after you close the tab. The conversion is instant because it operates on the string in memory, so even very long documents convert in a fraction of a second. The original text you paste is never modified; the converted result appears in the output area for you to copy.

Line breaks are preserved by operating on each line independently, so paragraphs and lists remain intact after conversion. For text that mixes scripts or contains numbers, only letter characters are affected by the case transform. To count the words and characters in your text before or after converting, use the Word Counter tool.