Watermark PDF Online - Add Text & Image Stamps
Stamp custom text or confidential marks with custom opacity and rotation across pages.
Choose File or Drag & Drop
Select Watermark PDF input files
How to Use Watermark PDF
Process your documents in 3 quick, private steps without installing any software.
Upload PDF
Select the PDF document you want to protect or brand.
Customize Watermark
Enter text (e.g. "CONFIDENTIAL"), pick rotation (45°, 0°, 90°), and set opacity.
Apply & Download
Stamp the watermark across all pages and save your protected PDF.
Why Choose SwiftFileKit for Watermark PDF?
Engineered for uncompromising privacy, lightning performance, and simplicity.
Local & Confidential
Proprietary drafts and company documents remain on your machine.
Custom Angles & Opacity
Adjust transparency and diagonal rotation for subtle background stamping.
All Pages in One Click
Applies seamlessly across every page in seconds.
Instant Compilation
Fast client-side vector text rendering directly onto document streams.
Frequently Asked Questions
Everything you need to know about Watermark PDF and our client-side architecture.
Can I customize the watermark text and opacity?
Yes! You can enter custom text, choose diagonal or horizontal rotation, and adjust opacity from 10% to 100%.
Does it watermark every page in the PDF?
Yes, the watermark is applied consistently across all pages of the document.
Are my confidential documents uploaded?
No, all watermarking is executed locally in your browser with zero server uploads.
Can the watermark be easily removed by viewers?
The watermark is embedded directly into the PDF content stream.
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