Add Watermark – Foxit Online

How to add watermark to PDF file? Choose PDF file you want to add watermark. Customize the watermark text content's appearance. Click Add Watermark button and save your file. It is that easy. Foxit Online's Add Watermark tool allows you to set text to stamp over your PDF files, including text content, font, color and opacity. Add watermark to your PDF file to indicate ownership information, and prevent unauthorized distribution of the document through screenshots. You don't need to download or install any software. All the operation will be done on the cloud.

Screenshots from Chrome Web Store