Add Custom Watermark to PDF Documents

Why watermark at all

A watermark declares a document’s status and ownership on every page: DRAFT stops a work-in-progress being mistaken for final; CONFIDENTIAL reminds every reader of handling rules; a company logo turns a plain report into branded collateral; and a recipient’s name on review copies discourages leaks by making every copy traceable.

Because the watermark is embedded into the page content itself, it survives printing, screenshotting, and re-saving — unlike a header note someone can crop away.

Designing a watermark that works

The best watermark is visible enough to do its job and subtle enough not to fight the content. PurePDF gives you text or image watermarks with control over position, rotation, size, and transparency.

• Classic document stamp: diagonal text at 45°, centered, 15–30% opacity, large font.
• Branding: logo at low opacity in a corner beats a giant centered logo that obscures content.
• Use light gray for text watermarks on printable documents — solid black ruins readability.
• Apply to all pages for status stamps; first page only can suffice for branding.

Local processing for sensitive drafts

Watermarking runs entirely in your browser — fitting, since the documents most worth stamping CONFIDENTIAL are the ones least suited to uploading. Your file never reaches a server, and the output carries no PurePDF branding of its own: your watermark is the only mark on the document, free, without an account.

Watermarks vs other markings

For one-off approval marks on specific pages, Add Stamps places individual APPROVED/REJECTED-style stamps rather than a repeating watermark. For page identification, Add Page Numbers or Header & Footer are the structured options. And remember a watermark is a deterrent, not security: content that must not be shared needs Redact PDF (to remove it) or Protect PDF (to encrypt the file), not just a label.