Add a watermark in a PDF on Firefox

Stamp DRAFT, CONFIDENTIAL or your own text across pages. On Firefox it runs in the browser, so there is nothing to install.

How to do it

1.Go to mythospdf.com in Firefox and drop the PDF onto the page.
2.Type the text and choose size, angle and opacity.
3.Download the PDF.

Tips for Firefox

• Works with strict tracking protection on.

What happens to the rest of the page

• The watermark is added as a layer; the original page content is not rewritten.
• Works on every page at once.

Questions people ask

+Can I remove a watermark later?

Keep the original file. Watermarks are added to the copy you download.

Other edits on Firefox

Add a watermark on

Ready to fix your PDF?

Free, in your browser, and it takes about a minute. No account needed.