Add Watermark to PDF
Stamp customized diagonal text, confidentiality badges, or your organization's logo across any PDF. 100% in-browser processing with real-time live preview.
Drop your PDF here, or browse files
Encrypted client-side. Works completely offline in airplane mode.
Applying Watermark to PDF...
Drawing vector stamps onto pages locally
Watermark Applied Successfully!
Your watermarked PDF is ready. No data ever touched a remote server.
Stamp custom text and image watermarks
Text & Image Stamps
Add 'CONFIDENTIAL', draft stamps, or company logo watermarks.
Angle & Opacity
Control 45° rotation, transparency, margins, and font size precisely.
Batch Processing
Applies watermarks to all pages simultaneously in local memory.
How to Add Text or Image Watermarks to PDF
Follow these 4 simple steps to process your files directly on your device with 100% privacy.
Select PDF
Drop the PDF document you want to stamp with a watermark.
Configure Watermark
Enter text (e.g. 'CONFIDENTIAL', 'DRAFT') or upload a logo. Set rotation, font size, and opacity.
Choose Page Range
Apply the watermark to all pages, first page only, or custom page ranges.
Download Watermarked PDF
Save your stamped document immediately with zero server latency.
Supported Formats & Processing Limits
Built for Everyday Productivity
Protect Unreleased Drafts & Internal Proposals
Stamp semi-transparent 'CONFIDENTIAL' or 'DRAFT' watermarks diagonally across every page to prevent leaks or premature distribution.
Add Company Branding & Logos to Client Deliverables
Stamp your corporate logo or copyright notice neatly in the corner of invoices, reports, and portfolio decks.
Client-Side PDF Security: WebAssembly vs Cloud Conversion
Examine how memory-isolated browser execution prevents eavesdropping, credential interception, and document data retention on third-party servers.
Frequently Asked Questions
Everything you need to know about browser processing, file safety, and format capabilities.
Can I adjust the transparency so my watermark does not hide document text?
Yes. You can adjust the opacity slider (from 10% to 100%) so text beneath the watermark remains perfectly legible.
Can I place a watermark behind the text instead of on top?
Yes. You can choose whether the watermark renders in the foreground (above content) or background (beneath content).
Can I use custom fonts or colors?
Yes. Choose from multiple standard font families, colors, and diagonal rotation angles (-45°, 0°, 45°).
Is my proprietary document uploaded to any external server?
No. The watermark layers are composited locally in your browser memory.