Watermark PDF
Stamp text like DRAFT or CONFIDENTIAL across every page — 100% in your browser, nothing uploaded.
Drop a PDF to watermark, or
About Watermark PDF
Watermark a PDF by stamping text — DRAFT, CONFIDENTIAL, a company name — diagonally across every page. Type your text and adjust how faded and how large it is; a live preview shows how it will look over your pages. The watermark is drawn semi-transparent so the content underneath stays readable. Everything runs in your browser with JavaScript, so your document is never uploaded to a server.
Frequently asked questions
- How do I add a watermark to a PDF?
- Drop in your PDF, type the watermark text (like CONFIDENTIAL), and set the opacity and size. The preview shows it over your pages; click Download to get a new PDF with the watermark on every page.
- Will the watermark cover up my text?
- No. It's drawn semi-transparent and you control the opacity, so the watermark is visible while the content underneath stays readable. Lower the opacity if it feels too strong.
- Is my PDF uploaded to a server?
- No. The watermark is applied entirely in your browser with pdf-lib; your file never leaves your device, so it's safe for sensitive or confidential documents.
- Can I add an image watermark, like a logo?
- This tool adds a text watermark (a word or phrase drawn diagonally across each page). For a logo, turn it into a PDF page first, or use a dedicated image-watermark tool.
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