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

Can I set the watermark opacity?
Yes. You can set the opacity from very faint to fully opaque, allowing the underlying document to show through clearly.
Can I rotate the watermark text?
Yes. You can set any angle for the watermark text, including the classic diagonal placement.
Is the watermark applied to every page?
Yes. The same watermark is applied consistently to all pages in the PDF.
Can I add an image watermark instead of text?
Currently the tool supports text watermarks only. Image watermarks are on the roadmap.
How long are my files stored?
Your uploaded PDF and the watermarked output are automatically deleted from our servers within two hours.