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How It Works

How the PDF Watermark Tool Works

DocDox PDF Watermark embeds customizable text or image watermarks into every page of a PDF document in your browser, using pdf-lib and a live canvas preview. Watermarks are burned directly into the PDF page content — they become part of the document and cannot be removed by simply deleting a layer.

Text watermarks support full customization: choose your watermark text (such as "CONFIDENTIAL," "DRAFT," "SAMPLE," or your company name), then configure the font size, opacity, rotation angle, and color. A canvas-rendered preview updates in real time as you adjust settings, showing you exactly how the watermark will appear before exporting. Image watermarks let you upload a logo PNG and control its size, opacity, and position across each page.

Everything runs locally — no file upload, no server processing. Even large PDFs with many pages are processed entirely on your device, with no file size restrictions and no cloud dependencies.

Common Use Cases
→Stamp draft documents with "DRAFT" to prevent premature distribution
→Mark internal presentations as "CONFIDENTIAL" before sharing
→Add "SAMPLE" to proposals sent before the contract is signed
→Brand exported reports with a company logo on every page
Frequently Asked Questions

Can the watermark be removed?

Watermarks added by this tool are burned into the PDF content, not added as a layer. Removing them requires advanced PDF editing tools and is not trivial.

Can I watermark just specific pages?

Currently the tool applies the watermark to all pages. Per-page watermarking is on the roadmap.

Does watermarking affect the text content or searchability of the PDF?

No. The watermark is added as a visual element. Existing text remains selectable and searchable.