PDFStamp a text watermark across every page.
Watermark PDF stamps your text (CONFIDENTIAL, DRAFT, a company name) diagonally across every page of the document in a light, semi-transparent gray that stays readable without hiding the content underneath.
Drop your PDF here
Upload filesSize up to 100 MB
Drop your PDF into the box above, or click to browse for a file. Files up to 100MB work.
Type the watermark text: CONFIDENTIAL, DRAFT, your company name, anything you like.
Click Add watermark. Every page is stamped diagonally in your browser and the result downloads as watermarked.pdf.
Universal PDF requires a Pro subscription. One subscription unlocks every tool on the site, cancel anytime. The watermarking itself happens entirely in your browser.
The text is stamped diagonally across the center of each page in bold Helvetica at low opacity, and it's sized automatically to span the page; long phrases render smaller so they still fit. It reads clearly without obscuring the content underneath.
Yes. The same text is stamped on every page of the document in one pass, so a hundred-page report is watermarked as quickly as a one-pager. To watermark only certain pages, split the PDF first, watermark that part, then merge it back.
No. The PDF is opened, stamped and rebuilt on your device, so it stays with you unless you email the result or save it to My Files.
Last updated: July 8, 2026