How to Add a Watermark to a PDF (Online, Free)

Watermarks show recipients a document is confidential, a draft, or copyrighted — without blocking reading like encryption does.

Text watermarks

Open Watermark PDF, upload your file, and add text such as CONFIDENTIAL or DRAFT. Adjust opacity so body text stays readable.

Image or logo stamps

Upload a PNG logo for brand previews or portfolio samples. Combine with Sign PDF when a draft becomes final.

Watermarks are not encryption

Anyone can screenshot a watermarked page. For real access control use Protect PDF. For password basics read unlocking password-protected PDFs safely.

Before you send

Compress large watermarked files and merge into packets when sending multi-part reviews.

Add your stamp with Watermark PDF — free online.