Good reasons to watermark a document
- Marking drafts — a "DRAFT" watermark stops an unfinished document from being mistaken for the final version if it circulates.
- Confidentiality — a "CONFIDENTIAL" stamp is a visible reminder before internal documents are forwarded further than intended.
- Sample previews — businesses sharing preview copies of paid content (reports, ebooks, templates) often watermark them to discourage full redistribution before purchase.
When a watermark gets in the way
A watermark that's too dark, too large, or placed over important text hurts readability more than it helps — the point is a visible reminder, not an obstacle to reading the document. Keep opacity low enough that the underlying text stays perfectly legible.
Diagonal vs straight placement
A diagonal watermark across the page is the most common style since it's visible without directly overlapping most body text, which tends to run horizontally. A straight, centered watermark can sit directly on top of text and reduce readability more.
Watermark your document
The PDFGuy Watermark PDF tool stamps your chosen text diagonally across every page, with adjustable size and opacity, entirely in your browser.