Add Watermark to PDF Document Free Online
Add a custom text watermark to every page of your PDF document online for free. Control opacity and position for the perfect watermark.
Drop file here or browse
Maximum file size: 50 MB
Adding a watermark to a PDF document is essential for branding, copyright notice, or marking documents as DRAFT, CONFIDENTIAL, or SAMPLE. CocoPDF adds text watermarks to every page of your PDF free online — with control over opacity, position, and the watermark text itself.
The watermark is drawn directly onto each page by our server-side PDF engine, making it a permanent part of the document. Choose from nine position options and adjust the opacity from completely transparent to fully opaque. The text uses Helvetica Bold at 48pt — large enough to be visible across an entire page without obscuring the content behind it.
Upload your PDF, enter your watermark text (such as "CONFIDENTIAL", "DRAFT", or your company name), set the opacity and position, then click Process. Your watermarked PDF downloads immediately. Files are deleted within one hour and the tool itself adds no additional watermarks to your output.
How to Watermark PDF Online — 3 Simple Steps
- 1
Upload your file
Drag and drop your file onto the upload box, or click to browse. CocoPDF accepts a file up to 50 MB each.
- 2
Adjust the settings
Choose the options you need for Watermark PDF. The default settings work well for most documents.
- 3
Download the PDF file
Click the process button. The file is generated on our server and your PDF download starts automatically.
Frequently Asked Questions
Can I choose where the watermark appears on the page?
Yes. The tool offers 9 position options: top-left, top-center, top-right, middle-left, center, middle-right, bottom-left, bottom-center, and bottom-right.
How do I make the watermark more or less visible?
Use the opacity slider. At 100% the watermark is fully opaque and very visible. At 20-30% it is subtle and semi-transparent. The center diagonal watermark at 30-40% opacity is a classic "CONFIDENTIAL" style.
Is the watermark permanent?
Yes. The watermark is drawn directly onto each page of the PDF. It cannot be easily removed by the recipient without specialized software.
What font is used for the watermark?
The tool uses Helvetica Bold, a universally available font embedded in all PDF readers. Custom font selection is not currently available.