Free PDF Watermark Online

Add a custom text watermark to every page of your PDF. Control the text, opacity, size, angle and color. No file upload — entirely browser-based using pdf-lib.

🔒 Private💧 Watermark🆓 Free

Drop PDF here or browse

PDF files only · Max 100 MB

About PDF Watermark

This tool renders a diagonal (or positioned) text watermark on every page of your PDF using pdf-lib. The watermark text, font size, color, opacity and rotation angle are all customizable. Processing happens entirely in your browser — no data leaves your device.

How to Add a Watermark to a PDF

Upload PDF

Drop or browse your PDF file (up to 100 MB).

Configure Watermark

Set text, color, size, opacity, angle and position.

Apply

Click "Add Watermark". Each page is processed in sequence.

Download

Download the watermarked PDF.