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Add a Watermark to a PDF

Stamp DRAFT, CONFIDENTIAL or your own text diagonally across every page, with control over size, angle and how faint it sits.

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One PDF file

What a watermark is for

A watermark communicates status. DRAFT stops a working version being quoted as final; CONFIDENTIAL reminds a recipient of an obligation they already have; SAMPLE prevents a specimen being passed off as the real document. In every case the job is to make the status travel with the page, including when only one printed sheet survives.

What it is not is protection. Anyone with the right tool can strip it in under a minute. The practical value is that it removes the excuse, nobody can claim they did not know a document was a draft when the word is printed diagonally across it.

Applied as text, not as a picture

The watermark here is drawn as an actual text object over the existing page content. The document below it is completely unchanged: same fonts, same vector text, same images, still selectable and searchable.

Many watermarking tools instead render each page to an image and stamp that. It works, and it silently costs you the text layer, the file gets larger, the text gets blurry at zoom, and a screen reader can no longer read it. If you have watermarked a PDF before and found it looked worse afterwards, that is why.

Getting the settings right

  • Opacity 15–25%. Legible on screen and on paper, without competing with the text. Test a printout if the document will be printed, screens are more forgiving than toner.
  • Size 40–60pt for a single word. Longer phrases need smaller type or they run past the page edge; the tool centres the text on the page, so a phrase that is too large will overflow.
  • 45° for the classic diagonal, 0° for a horizontal band. Diagonal is harder to crop away and reads as a status stamp rather than a heading.

Order of operations

Watermark last. If you also need to rotate or remove pages, do that first, the watermark is applied per page, so pages added afterwards will not carry it. If the document also needs to fit a size limit, compress after watermarking so the final file is the one that meets the limit.

One more step worth taking before a document leaves your organisation: the metadata viewer shows the author name and software fingerprint the file is carrying, which a watermark does nothing to hide.

Frequently asked questions

Does the watermark reduce quality?

No. It is drawn as real text on top of the existing page, so the document underneath is untouched and stays selectable and searchable. Tools that flatten each page to an image to apply a watermark are the reason watermarked PDFs often look worse.

Can the watermark be removed?

Yes, by anyone with the right software, it is a visible mark, not protection. Treat it as a label that states intent ("this is a draft", "do not circulate"), not as security. Genuine restriction needs encryption or a document-rights system.

What opacity should I use?

Around 15–25% for something that reads clearly without fighting the text underneath. Below 10% it disappears on printouts; above 40% it starts making body text hard to read, which defeats the point of sending the document at all.

Why is the watermark diagonal by default?

A 45° diagonal crosses the widest part of the page, so it is visible on every part of a printout and awkward to crop out. It also sits across the natural reading direction, which is what makes it register as a status marker rather than page content.

Can I watermark only some pages?

This applies to every page, which is the usual requirement, a draft marked on page one only is not marked at all once someone prints page four. To treat a section differently, split the document first, watermark one part, then merge them back.