Preview first
Switch between PDF cards and full page previews, then reorder or remove items before processing.
← All PDF tools
Edit PDF
Add Watermark
Stamp custom text across PDF pages with adjustable opacity.
✓ Secure processing✓ No signup✓ High-fidelity output✓ Page preview
1Select files2Preview & adjust3Process & download
Choose PDFs
Drag and drop here, or click to browse your device.
PDF-only actions stay on this device. Office conversions use the protected Python document engine.New files are added without deleting your current selection.
Processing problem
Preparing your file0%
Please keep this tab open while the document conversion finishes.
Choose a file to continue.
About this tool
Add Watermark without complicated software
Add watermark: Place text such as Confidential, Draft or your brand across every PDF page with adjustable strength.
Protected conversion
Browser-capable PDF actions remain local. Document conversions use an isolated Python process and temporary files are deleted automatically.
Direct download
The finished file is returned directly to this page for download after processing.