Add Watermark to PDF
Mark a PDF as confidential, draft or your own with a text watermark on every page. Adjust the opacity and angle, then download — or drop in a whole set of PDFs to stamp them all with the same watermark in one pass and download them as a .zip. All in your browser.
Last updated: July 2026
This tool stamps a text watermark — like “CONFIDENTIAL” or “DRAFT” — across every page of a PDF, with adjustable opacity, font size and a diagonal or horizontal angle. The watermark is drawn into the file with pdf-lib entirely in your browser, so your document is never uploaded to a server.
How to use Add Watermark to PDF
- Choose one or more PDF files.
- Type your watermark text and adjust opacity, size and angle.
- Click “Add watermark & download” — or “Download all” as a .zip for a batch.
Frequently asked questions
Does it watermark every page?
Yes — the text is applied to all pages of the document.
Can I watermark a whole folder of PDFs at once?
Yes. Select multiple PDFs and the same watermark is stamped on every page of every file, processed one at a time, then offered individually or as a single .zip.
Is my PDF uploaded?
No — watermarking happens locally in your browser.
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