Add a text watermark like DRAFT, CONFIDENTIAL, or your company name across every page of a PDF. Choose a corner or center position, set the opacity, and turn on the diagonal option for a classic across-the-page stamp. The watermark is drawn into the PDF entirely in your browser, so your document is never uploaded — and the only watermark on your file is the one you chose.
Add your PDF
Drop the PDF onto the page or browse for it. Files up to 100 MB are processed locally.
Type your watermark text
Enter the words you want stamped on each page, such as CONFIDENTIAL, DRAFT, or a name. It's applied to every page.
Set position and style
Turn on Diagonal for a 45-degree stamp across the page, or pick a corner/center position. Adjust the opacity and font size sliders to taste.
Apply and download
Click Add watermark. Your browser draws the text onto each page and downloads the watermarked PDF immediately.
No. The watermark is drawn onto your pages entirely in your browser using pdf-lib. Your document is never sent to or stored on a server, so you can mark up confidential drafts and internal files without any copy leaving your device.
Never. The only text stamped on your PDF is what you type. There's no ConvertOwl branding, no promotional footer, and no hidden mark — the tool is completely free and adds nothing of its own to your output.
Yes. You choose the text, its opacity from faint to bold, and its font size. Enable the diagonal option for a 45-degree stamp across the center of each page, or disable it to place the text in a corner or centered horizontally.
Yes, by default the text is stamped on all pages of the document so the mark is consistent throughout. This makes it ideal for labeling an entire draft or confidential file in a single step.
The watermark is drawn into the page content, so it becomes part of the document rather than a separate removable layer. Keep an unwatermarked copy of your original if you'll need a clean version later — the stamped output is meant to be permanent.
Yes. The watermark is drawn as real vector text using a standard font, not a rasterized image, so it stays crisp at any zoom level and prints cleanly. Your underlying pages are unaffected apart from the added text.
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