Watermark a PDF across every page

Real text, not a picture pasted on top

A watermark is usually the thing you add to a document before sending it to somebody you do not entirely trust, which makes uploading it to a stranger a strange first step. Docqify draws it in your browser. It is drawn as real text rather than a flattened image, so the words stay sharp at any zoom, the page underneath is untouched, and the file barely grows. The first page is shown with the stamp already on it, positioned by the same calculation that writes the document.

• Position, angle, size, colour and opacity are all yours, and the preview updates as you change them.
• Pages stored sideways get the watermark the right way up. The centre of a rotated page is still its centre, but the angle has to be worked out against what the reader sees.
• The built-in PDF fonts cover Latin letters, accents, dashes and quotes. Scripts like Devanagari, Chinese, Japanese and Cyrillic are not in them, and Docqify says so rather than writing an invisible watermark.
• Everything runs on your device. The page ships a Content Security Policy that blocks connections to any other origin, so a document you stamp here cannot be sent anywhere.