Add Watermark to PDF
Stamp your PDF with a custom text watermark.
Drop PDF file here or click to browse
PDF file, no size limit
How It Works
Upload PDF
Select or drag-and-drop your PDF file
Customize
Set your watermark text, opacity, angle, color, and font size
Download
Get your watermarked PDF instantly
Frequently Asked Questions
How do I add a watermark to a PDF?
Upload your PDF, type your watermark text, adjust opacity, angle, color, and font size, then click "Add Watermark". Your watermarked PDF will be ready to download instantly.
Can I customize the watermark appearance?
Yes! You can set the text, opacity (10-90%), angle (diagonal or horizontal), color (gray, red, blue, or black), and font size (small, medium, or large).
Can I apply the watermark to specific pages only?
Yes. Choose "Custom" under "Apply to" and enter a page range like "1-3, 5, 7-10" to watermark only those pages.
Is this safe to use?
Yes. ArmorPDF processes everything in your browser using JavaScript. Your files never leave your device and are never uploaded to any server.
Will the watermark cover the existing text?
The watermark is drawn on top of existing content with configurable opacity, so you can adjust the transparency to make sure your document stays readable.
Does this work on mobile devices?
Yes. ArmorPDF works in any modern browser on any device, including iPhones, iPads, and Android phones.