Free Online Tool

Watermark PDF Without Uploading

Add text watermarks to PDFs without any server upload. Keep client drafts and sensitive documents private.

Watermark PDF Privately

How to Use This Tool

  1. 1
    Open the watermark tool in your browser.
  2. 2
    Upload the PDF and enter your watermark text.
  3. 3
    Customize style and download the marked file.

Why use sotool?

Client-Ready Privacy

Drafts and confidential documents never leave your device, reducing leak risk before distribution.

Custom Text Watermarks

Adjust opacity, angle, and position to create a visible but readable mark.

No Signup Needed

Start using the tool immediately without creating an account or logging in.

Browser-Based

Works on Windows, Mac, Linux, Android, and iOS as long as you have a modern browser.

Frequently Asked Questions

Yes. The watermark is rendered in your browser and embedded into a new PDF that downloads locally.

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