The Smart Typographer is a text beautifier: it takes the kind of text people type every day - straight quotes, double hyphens, three dots, (c) spelled out - and replaces it with the characters that professional typesetting uses. An apostrophe becomes a real apostrophe, -- becomes an em dash (—), ... becomes one ellipsis glyph (…), and the little bracket spellings turn into ©, ® and ™. Nothing is rewritten about your words themselves; only the punctuation and symbols get upgraded, so the text reads the same but looks published instead of rough.
Why is that useful? Because plain quotation marks and hyphens are typing shortcuts, not typography. Word processors used to do these fixes silently; text boxes, social media, CMS forms and code editors do not - which is why drafts pasted from those places look flat and slightly amateur. Beautifying them takes seconds: choose a quote style (English, French or German conventions), switch on the fixes you want, and the tool rewires every quote, dash, dot and symbol in context - it can tell the quotation mark that opens a quotation from the one that closes it, and it knows the difference between an apostrophe, a decade such as ’90s and a genuine opening single quote. Where useful, it can also collapse accidental double spaces without touching anything else.
It is written with plain vanilla JavaScript - no libraries and no frameworks - and runs entirely inside your browser. Every conversion is a small Unicode character map applied on your own device: your text is processed locally, never uploaded anywhere, and the page keeps working while you are offline once it has loaded. The only thing that leaves the tool is whatever you choose to copy or download.