How to watermark PDF online
To add a watermark to a PDF, open one or more files, type the watermark text or place an image, and set the font, size, colour, transparency, rotation, and position on the nine-point grid, or tick Mosaic to repeat it across the page. Choose whether it sits over or below the page content, check the live preview, and click Add watermark. The watermark is drawn into every page, or only the pages you choose, and the result downloads straight away.
Step by step
Three steps. Most files take a few seconds.
Step 1: Open your PDF
Drop one or more files onto the page.
Step 2: Design the watermark
Place text or an image. Set font, size, colour, transparency, rotation, position or Mosaic, and over or below the content.
Step 3: Apply and download
Check the preview and click Add watermark.
Why use this tool
Text or image
Use DRAFT, CONFIDENTIAL, a copyright line, or a transparent PNG logo.
Fine control
Font, size, colour, transparency, rotation, a nine-point position grid, Mosaic, and the layer are all adjustable with a live preview.
All pages at once
The watermark is applied consistently to every page, or only to the range you choose.
Your file is never stored
Your document is used only to produce the result you asked for. Once the download is ready and you leave the page, the file is gone. There is no copy to keep, no account that holds it, and nothing to delete later.
That makes it safe for invoices, contracts, bank statements, ID scans, medical records, and anything else you would rather keep to yourself.
Read how it worksFrequently asked questions
How do I add a watermark to a PDF for free?
Open Watermark PDF, add the file, type your text or place a logo, adjust the look, and click Add watermark.
Can the watermark be removed?
The watermark is drawn into the page content, so it cannot be toggled off in a viewer. Keep your original file if you need a clean copy.
Can I watermark only some pages?
Yes. Enter a page range, for example 2-10, and the other pages are left untouched.
Is it safe to use this with confidential documents?
Yes. Your file is used only to produce the result you asked for and is never stored. We do not keep copies, read the contents, or share them with anyone. Once you download the result and close the page, the file is gone.
Is this really free?
Yes. Every tool on PDF Editor Box is free to use without signing up. We may show an ad outside the work area, but we never gate features, add watermarks to your output, or limit how many files you process.