Add a watermark to multiple PDF files at once

Add the same diagonal watermark text to multiple PDF files at once, for example "Draft" or "Confidential". Download all files together in a ZIP. Free, local in your browser.

Drop one or more PDFs here

Drop here or click to choose

Files stay on your device — nothing is uploaded

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Your file is processed in your browser and never uploaded.

How does it work?

1
Choose your PDFs
Drag multiple PDFs here.
2
Type the watermark text
For example Draft, Confidential or Copy.
3
Watermark & download
Download all watermarked files in one ZIP.

Frequently asked questions

Can I customise the color or position?

No, this tool uses a fixed diagonal gray style across the center of each page. For more options, use the single-file watermark tool.

Are my files uploaded?

No. Everything happens in your own browser. Your file never leaves your device and is not stored anywhere.

Is it free?

Yes, completely free, without watermark or account. The site is paid for by ads.

Why in the browser?

PDFrust runs entirely in your browser using WebAssembly and modern JavaScript libraries such as pdf-lib and PDF.js. Your file is never sent to a server — all processing happens locally on your device. This means your documents remain private by design, regardless of what they contain. There is no account required, no file size limit, and nothing is stored after you close the tab.