What the PDF Watermark Adder Does and Why It Matters
The PDF Watermark Adder stamps a text watermark — at the colour, size, opacity, and position you choose — onto the pages of a PDF, using pdf-lib in your browser. It is useful for marking documents as DRAFT, CONFIDENTIAL, or with your brand.
This matters because a visible watermark signals status and ownership and discourages misuse of a shared file. Applying it on-device means the document you are protecting is never exposed to a third-party server in the process.
How to Use PDF Watermark Adder
- Upload the PDF you want to watermark.
- Enter your watermark text (for example CONFIDENTIAL).
- Set the colour, size, opacity, and position so it is visible but not overwhelming, and choose whether to stamp all pages, only the first, or only the last.
- Run the tool to stamp the watermark on the selected pages.
- Download the watermarked PDF.
Supported Inputs and Limitations
What you provide
- A PDF file
- Watermark text, plus colour, size, opacity, position, and page-range settings
What you get
- The PDF with a watermark on each page
- A downloadable, marked document
Known limitations
- The watermark is a visual overlay; it does not encrypt or lock the document.
- Determined users can still remove overlays with specialist software, so it is a deterrent, not security.
- Very low opacity may be hard to see; very high opacity can obscure content.
Privacy and Security
Watermarking is performed entirely in your browser using pdf-lib. Your PDF is processed on your device and is never uploaded to NovaTools or any external server. The pdf-lib library itself is loaded from a public CDN.
Frequently Asked Questions
Can I watermark only some pages?
Yes. You can stamp the watermark on every page, only the first page, or only the last page. The tool applies a text watermark; image/logo watermarks are not supported.
Does a watermark protect my document?
It is a visual deterrent indicating status or ownership, not encryption. For real protection, also use access controls or password protection.
Is my file uploaded?
No. The watermark is applied locally and the document never leaves your browser.