Watermark PDF
Set the words, the angle and how faint you want them, and Quill sizes the stamp to the page and lays it across every sheet you choose. It blends with the page rather than blocking it, so the document underneath stays readable.
The stamp is composited in Multiply, so it darkens the page rather than covering it and the text underneath stays readable. Font size is derived from the measured width of your text, so short and long strings both span the fraction of the page you asked for.
The PDF is read on your device. For a watermark you can move and restyle by hand afterwards, open it in the editor instead.
CONFIDENTIAL is the starting point; replace it with DRAFT, a client name, a date or anything else. Font, weight and italics are all selectable.
Set the rotation, the opacity, the colour and how much of the page width the text should span. It is scaled to fit each page rather than to a fixed point size.
Stamp the whole document or just a range, then export.
The stamp is composited in Multiply mode, so it darkens the page instead of painting over it. Text under the watermark stays legible — the usual failure of a flat overlay at anything above minimal opacity.
You choose what fraction of the page width the text should occupy and the font size is derived from the actual measured width of your string. A short word and a long sentence both land proportioned correctly, on A4 and on US Letter.
A single centred stamp is the usual choice for DRAFT or CONFIDENTIAL. Tiling repeats the text in a grid instead, which is much harder to crop out of a screenshot — the right choice when the watermark is there to discourage redistribution rather than to label a revision.
A calm, fast PDF workspace. Free to use, private by default.