Case Converter Online

We've all done it: you type an entire paragraph while looking at your keyboard, only to look up and realize Caps Lock was on. Instead of deleting it and starting over, or manually trying to standardize a messy list of blog post titles, you can paste the text here and let JavaScript reformat it instantly.

How Sentence Case Works

The logic behind Sentence Case is surprisingly tricky. The script has to parse your text block, identify terminal punctuation (periods, question marks, exclamation points), and capitalize only the immediate next letter while aggressively forcing everything else to lowercase. Keep in mind that this algorithmic approach will destroy proper nouns (like changing 'London' to 'london'), so you'll need to do a quick proofread afterwards.

Unicode Support

This tool using modern browser APIs, which means it isn't limited to the English alphabet. If you paste text containing accented characters like é or ç, the tool knows how to properly capitalize them to É and Ç without corrupting the string.

Fast and Private

Whether you are converting a sensitive legal document or an unpublished manuscript, security matters. The formatting happens inside your browser tab locally. Nothing is ever sent to a remote server.