Watermark PDF Online Free

Watermark PDF Online Free

Watermark PDF is a free online tool that adds a customizable diagonal text watermark to every page of your PDF document. Mark documents as Confidential, Draft, Sample, For Review, or with your company name — instantly, without any software installation or file upload to a server.

Why Add a Watermark to Your PDF?

Watermarks serve multiple important purposes in professional document management. They indicate the status of a document — such as Draft or Approved — communicate ownership and branding, deter unauthorized copying or redistribution of proprietary content, and provide a clear visual indicator for review copies that should not be treated as final versions.

Adding a watermark is especially important when sharing proposal documents with clients, distributing sample reports, sending review copies of legal contracts, or protecting intellectual property in PDF-based publications and eBooks.

How It Works

Our tool uses PDF-lib to embed your watermark text directly into the PDF page content stream. You can customize the watermark text, adjust the opacity (from nearly invisible to bold), and set the rotation angle for diagonal or horizontal placement. The watermark is applied consistently across all pages of the document.

Key Features

Custom Text: Enter any watermark text — company name, status, or copyright notice.
Adjustable Opacity: Control how visible the watermark appears on the page.
Rotation Control: Set diagonal, horizontal, or custom angle placement.
All Pages: Watermark is applied uniformly to every page.
No Server Upload: Processing is entirely client-side for full document privacy.

Frequently Asked Questions

Can the watermark be removed?
Watermarks added via this tool are embedded in the page content and are difficult to remove without advanced PDF editing software. For stronger protection, combine with our Protect PDF tool to add password encryption.

Can I add an image watermark (logo)?
Currently, only text watermarks are supported. Image watermarks may be added in a future update.