Watermark PDF

Add a diagonal bottom-left to top-right text watermark across your document pages.

100% In-Browser · Documents never uploaded to any server

Select a PDF to watermark

Drag and drop your PDF here, or click to browse

Apply diagonal security watermarks with live real-time preview.

How to Add a Diagonal Watermark to PDF Online

Select any PDF file from your phone, tablet, or computer.

Type custom text, choose font size and subtle transparency with live preview.

Saves directly with vector text embedded diagonally from bottom-left to top-right.