Add a watermark to a PDF in 3 steps
- Open the free watermark tool — processing happens in your browser, so confidential drafts stay on your device.
- Select the PDF and enter your watermark text: DRAFT, CONFIDENTIAL, DO NOT COPY, or a company name.
- Download the stamped copy. Every page gets a diagonal semi-transparent mark.
When to watermark (and what text to use)
- DRAFT — circulating a contract or report before final approval.
- CONFIDENTIAL — HR documents, financials, board packs.
- SAMPLE / VOID — sharing certificate or invoice templates publicly.
- Client name + date — deterring resale of paid PDFs (each copy is traceable).
- DO NOT COPY — coursework and exam material.
A watermark is a deterrent, not security
Be realistic: a determined person can crop, cover, or re-OCR a watermarked page. Watermarks discourage casual misuse and make leaked copies traceable — they do not encrypt anything. For real protection, combine measures: watermark for provenance, and if content must be hidden, cover it with the blackout tool (noting it’s visual cover, not certified redaction) or share via access-controlled storage instead of email. More in secure PDF tools 2026.
Free browser tool vs Adobe vs Word export
Adobe Acrobat Pro offers image watermarks and per-page control at a subscription price. Word can watermark before export, but only if you own the source document. The browser route is free, instant, and works on files you received from others. Typical workflow: assemble the document with the merger, stamp the watermark, then add page numbers last so nothing overlaps.