All tools · Documents · Watermark PDF

Watermark PDF.

A watermark marks a document as yours, as a draft, or as confidential, on every page at once. This tool draws your text diagonally across each page at an opacity you choose, using pdf-lib compiled to run in your browser — so the document, often a contract or a draft you are not ready to release, never leaves your device.

Drop PDF files here, or browse

Files stay on your device — nothing is uploaded.
i. Drop the PDF onto the box above.
ii. Type your watermark text and set the opacity.
iii. The text is drawn diagonally across every page in your browser.
iv. Download the watermarked PDF. Nothing was uploaded.
More tools: Sign PDFPage numbersProtect PDF

Frequently asked questions

Is my PDF uploaded to add the watermark?

No. The watermark is drawn into the file entirely in your browser via pdf-lib, running client-side. It works with Wi-Fi off, and the document never leaves your device.

Can the watermark be removed again?

It is drawn into the page content, so it is not a layer a normal reader can toggle off. It is not a security feature, though — anyone determined can rasterise or edit a PDF, so treat a watermark as a clear marking, not as protection.

Can I use my own logo image?

This tool stamps text. For a signature or logo image placed on specific pages, use the Sign PDF tool, which lets you upload an image and position it.

Embed this tool

Add this free, no-upload tool to your own site with one line:

<iframe src="https://fileanvil.com/embed/watermark-pdf/" width="100%" height="480" style="border:1px solid #ddd;border-radius:12px" title="Add a Watermark to a PDF"></iframe>