💧 Add Watermark

Stamps a text watermark onto PDF pages using PyMuPDF. Configure the watermark text, font size (8–200 pt), font style, opacity (0–100%), rotation angle, hex colour, and one of eight positions: Diagonal, Centre, Top-Left, Top-Right, Bottom-Left, Bottom-Right, Header, or Footer. Apply to all pages, odd pages, even pages, or a custom page range. A live preview card updates as you adjust the settings so you can see the watermark description before processing.