Add watermark
Add text or image watermarks to PDF documents.
Drag & drop a PDF file here, or click to select
Single PDF file only
A practical guide to Add watermark
Add Watermark places text or an image mark on PDF pages with explicit position, color, size, and opacity controls. It is suited to draft labels, ownership marks, and distribution context.
Example: mark an approval copy as confidential
Place a low-opacity CONFIDENTIAL label in the center, use a size readable on printouts, and inspect dense pages to ensure the mark does not hide critical text.
Task-specific steps
- 1
Choose the final PDF and decide whether a text label or branded image is appropriate.
- 2
Set content, placement, size, color, and opacity while checking the page preview.
- 3
Export and inspect light, dark, and image-heavy pages to confirm the mark remains visible without obscuring content.
Options that affect the result
- Position presets place the mark consistently across pages.
- Font size, color, and opacity balance readability against document content.
Limitations to know first
- A visible watermark discourages casual reuse but does not technically prevent editing or removal.
- One fixed placement may overlap content differently on pages with mixed sizes or orientations.
Questions specific to this task
What opacity works for a PDF watermark?
Use the lowest opacity that stays legible on both screen and print. Dense backgrounds may need a stronger value than mostly white pages.
Does a watermark prove document authenticity?
No. It is a visible label, not cryptographic proof. Use a certificate-based digital signature when recipients must verify integrity and signer identity.