Escape HTML entities
Convert characters like < and & into safe HTML entities.
What to know
The five characters that can break out of HTML context are escaped: ampersand, less-than, greater-than, double quote and apostrophe. Escaping these is what prevents user-supplied text from being interpreted as markup.
Questions
Is anything uploaded to a server?
No. Every tool on this site runs inside your browser using standard web APIs. There is no upload, no account, no logging and no server holding your data afterwards. You can confirm it by opening your browser's developer tools and watching the network tab stay empty while you work.