Watermark PDF
Stamp a text or image watermark on every page, privately in your browser.
Files never leave your device · No upload · Free
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How to watermark a PDF
- 1
Add your PDF
Drop or select the PDF you want to watermark.
- 2
Design the watermark
Choose text or an image, then set opacity, angle and layout.
- 3
Apply & download
Stamp every page and download, built entirely on your device.
Why watermark PDFs in your browser?
Marking a document “Confidential” or branding it with your logo shouldn’t require uploading it to a third party. PDFMergely applies the watermark locally, the stamped file is created on your device and never transmitted.
Frequently asked questions
Is my file uploaded?+
No. The watermark is applied in your browser. Your PDF is never uploaded.
Can I use my logo?+
Yes, switch to Image mode and upload a PNG or JPG. The image stays on your device too.
Can I make it semi-transparent?+
Yes, use the opacity slider for a subtle, see-through watermark.
Is it free?+
Yes, watermarking PDFs is completely free with no sign-up.