Add Watermark to PDF — Free Online

Add Watermark stamps custom text across every page at the opacity and position you choose. Common for drafts, confidential markings or branding. Browser-based processing on PDFStudio Pro — free and private.

Open Add Watermark to PDF tool now

Step-by-step instructions

Open Add Watermark.
Upload the PDF.
Enter text, opacity and position.
Download the watermarked PDF.

Supported formats

PDF (.pdf).

Privacy & security

Files are processed locally in your browser. We do not operate an upload endpoint for this tool. Temporary data is released when you leave the page. The site is served over HTTPS. See our Privacy Policy.

Pricing & workflow

Price: Free forever — no limits, no watermark. Workflow: open tool → add file(s) → process in browser → download. Works offline for most operations once libraries are loaded. Compatible with Chrome, Edge, Firefox and Safari on desktop and mobile.

Frequently asked questions

Is Add Watermark to PDF free?

Yes. Unlimited use, no registration, no watermark.

Are my files uploaded?

No. Processing is 100% in-browser.

Can I use it on mobile?

Yes, on modern mobile browsers.

Is there a file size limit?

We do not set a server limit. Practical limits depend on your device memory.

Does it add a watermark?

No. Output contains only your content.