PDF & File Tools
Watermark PDF Online
Stamp a text watermark across every page of a PDF — control the text, size, and opacity. Nothing is uploaded.
Formula reviewed against common document-marking conventions used for drafts and confidential files · Last checked Aug 2026 · methodology
Drop a file here or click to browse
PDF files only, processed entirely on your device
100% Client-Side — Zero Files Uploaded
Reference
Opacity by use case
| Use case | Suggested text | Opacity |
|---|---|---|
| Internal review draft | DRAFT | 10–20% |
| Shared but sensitive doc | CONFIDENTIAL | 25–35% |
| Portfolio / sample work | SAMPLE — Your Name | 40–60% |
| Discourage redistribution | Company / owner name | 60–80% |
Higher opacity is harder to miss but also harder to read through — for documents people still need to read comfortably, stay under 35%.
FAQ
Common questions
Yes — the opacity slider controls exactly that, from a faint 10% overlay that barely interrupts reading to a bold 80% stamp that is hard to miss. Lower opacity works well for internal drafts; higher opacity is better for discouraging redistribution of a final copy.