Add Watermark to PDF Free Online
Stamp custom text or confidential watermarks across PDF pages at any rotation angle.
How to Add Watermark
Upload Your PDF
Select the PDF document you want to protect with a watermark stamp.
Design Your Watermark
Set the watermark text, font, transparency level, color, and rotation angle.
Download Watermarked PDF
Click Apply and download your PDF with the watermark stamp on every page.
Add visual watermarks to PDF files
Protect your documents from unauthorized copy or theft. Overlay text watermarks with custom fonts, transparency, rotation angles, and colors on all or specific pages.
Your intellectual property is safe with us: the stamp is applied client-side inside your browser, so your files never touch a remote server.
Frequently Asked Questions
Are edits made with Add Watermark permanent?
Yes, all changes are permanently written into the downloaded PDF file. Your original uploaded file is never modified — the tool creates a new file with your edits applied.
Is it safe to use Add Watermark with confidential documents?
Absolutely. Add Watermark processes everything locally inside your web browser using JavaScript and WebAssembly. Your files are never uploaded to any external server. Sensitive documents, contracts, and personal files remain completely private on your device.
Is Add Watermark really free? Are there hidden limits?
Yes, Add Watermark is 100% free with no hidden costs. There are no file size limits, no daily usage caps, no watermarks on your output, and no account registration required. Use it as many times as you need.
Can I adjust watermark transparency?
Yes. You have full control over the watermark text, font, color, transparency level (opacity), rotation angle, and which pages it appears on.