Free PDF Tool · Marks

Watermark PDF

Watermark PDF is a browser-based PDF tool on PDFToolsBase. Watermark PDF: free watermark pdf in your browser. No server upload, no signup, no PDF Tools Base branding. Works on Windows, Mac, Linux, iOS, Android. To use it, upload or drop your PDF and view the result directly in your browser — no signup and nothing to install.

Run watermark pdf in your browser. Free, private, no signup — your selected files are processed in your browser and are not uploaded to our server.

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Drop your file here

or click to browse from your device

Accepts: .PDF
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About this Watermark PDF

Add a text or image watermark to selected pages or all pages with our watermark pdf tool. Choose opacity, rotation, layout, position, and an optional page range.

Text watermarks/stamps are drawn as PDF text using the selected color, opacity, rotation, layout, and position. Image watermarks are embedded as PNG/JPG overlays.

Your privacy is the default. Your selected files are processed in your browser and are not uploaded to our server; all processing happens client-side using browser PDF libraries such as pdf-lib and PDF.js where needed. Closing the tab clears the working session from this page; downloaded files remain on your device.

This tool is free to use with no signup required. Large files may be limited by your browser’s memory and device performance. Part of PDF Tools Base, a privacy-first collection of 161 PDF utilities. Bookmark the page for next time, and explore related tools in the footer below.

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How to use the Watermark PDF tool

  1. Drop the PDF you want to stamp into the upload area.
  2. Set your watermark text (default "DRAFT"), opacity 25% and rotation 45°.
  3. Click Process to apply the watermark across the pages.
  4. Download the watermarked PDF.

Why use PDF Tools Base?

100% Browser-Based

Watermark PDF processes selected files in your browser. Your selected files are processed in your browser and are not uploaded to our server.

No Server Upload, No Signup

Your selected files are processed locally in your browser. No account, no server upload, no email needed.

No extra branding

The output contains only the watermark or stamp you choose; PDF Tools Base does not add separate branding.

Free to Use

No accounts and no signup. Use the tool as much as you need within reasonable browser limits.

Works on Every Device

Windows, Mac, Linux, iPhone, iPad, Android, Chromebook. Any modern browser.

Built on Open Source

Powered by browser-side PDF libraries such as pdf-lib and PDF.js, depending on the operation.

Common uses for watermark pdf

Mark drafts

Indicate "DRAFT" or "DO NOT DISTRIBUTE".

Brand documents

Add your company name to every page.

Confidentiality

Stamp "CONFIDENTIAL" before sharing.

Copyright notice

Add your © + name to public files.

Frequently asked questions

Is Watermark PDF safe to use?

Yes. Everything happens in your browser. Your selected files are processed in your browser and are not uploaded to our server. Closing the tab clears the working session from this page; downloaded outputs remain on your device until you delete them.

Do I need to register or sign in?

No. No account, no email, no sign-up. Open the page and start using the tool immediately. Free to use, no signup needed.

Does PDF Tools Base add its own branding?

No. The output contains only the watermark or stamp you choose; PDF Tools Base does not add separate branding.

Is there a file size limit?

There is no fixed limit. Files are processed in your browser, so RAM, page count, and file complexity affect what is feasible. Phones may struggle with large PDFs; try splitting first or use a desktop browser.

Does this work on mobile devices?

Yes. The tool works on all modern mobile browsers: Chrome on Android, Safari on iOS, Firefox, Edge, Brave. The drag-and-drop also accepts files from your phone’s file manager.

Will watermark pdf put a watermark in front or behind?

Browser-side output is overlay-only: it is drawn in front of the original PDF content using your selected opacity, rotation, layout, and position. True behind-content watermarking is not supported here.