How to add a watermark to a PDF

  1. 1

    Upload your PDF

    Upload the PDF you want to watermark.

  2. 2

    Set watermark text

    Enter the watermark text (e.g. CONFIDENTIAL or DRAFT) and adjust the font size, opacity, and angle.

  3. 3

    Apply and download

    Click Add Watermark. Download the watermarked PDF when it is ready.

About PDF watermark tool

Adding a watermark to a PDF is a standard way to mark documents as drafts, confidential, or sample copies before distributing them. DocumentFlipper lets you add a custom diagonal text watermark to every page of a PDF, with control over the text, size, opacity, and rotation angle.

The watermark is applied to every page of the document at a consistent position and scale. You can set the opacity low enough to keep the underlying content clearly readable while still making the watermark visible. The text, font size, angle, and colour are all adjustable to suit your document's style.

Your file is processed on our secure server, and both the original and the watermarked output are deleted within two hours.

Frequently asked questions

Is the watermark permanent?
Yes, the watermark is embedded into the PDF and cannot be easily removed without specialised tools. For extra protection, consider also using Protect PDF.
Can I watermark only certain pages?
Currently the watermark is applied to all pages. Page-selective watermarking is coming soon in a Pro feature.
What text can I use?
Any text up to 50 characters — common choices are CONFIDENTIAL, DRAFT, DO NOT COPY, or your company name.
Can I add a logo instead of text?
Currently only text watermarks are supported. Image/logo watermarks are on the Pro roadmap.
Is it free?
Yes — adding a text watermark to your PDF is completely free with no sign-up required.