Add Watermark
Stamp a text watermark on every page of your PDF.
Processed in your browser — files never uploaded
Drop your PDF file here
or click to browse
Max file size: 100MB
Add Watermark online, free and secure
Stamp a text watermark across every page of a PDF to mark documents as Confidential, Draft, or with your brand. Adjust size, opacity, angle, and color — processed entirely in your browser.
How to add watermark
Upload your PDF
Select the PDF you want to watermark.
Customize the watermark
Type your text and set the font size, opacity, angle, and color.
Download the watermarked PDF
Save your document with the watermark applied to all pages.
Why use Kobra PDF to add watermark
- Mark documents as Draft, Confidential, or branded
- Control opacity, angle, size, and color
- Processed in your browser for privacy
Add Watermark — frequently asked questions
- Can I control how visible the watermark is?
- Yes. Adjust the opacity so the watermark can be a subtle background mark or a bold, prominent stamp.
- Is the watermark applied to every page?
- Yes. Your watermark text is stamped consistently across all pages of the document.
- Can I add an image watermark, like a logo?
- This tool applies text watermarks. For a logo, add it as content using the Edit PDF tool.
- Is my document uploaded anywhere?
- No. Watermarking runs in your browser, so your file is never sent to a server.