Preflight Checklist
Check common print issues
CONFIDENTIAL Stamp
Add preset CONFIDENTIAL watermark
This tool processes your files entirely in your browser. Your documents never leave your device.
Input
Drag & drop PDF files here
or Browse Files
PDF, PDF•Max size: 100MB per file
Output
Upload a PDF file
About This Tool
Add CONFIDENTIAL stamps to PDF documents with our free online one-click stamping tool. Apply large diagonal 'CONFIDENTIAL' watermarks across all pages with professional preset styling compatible with Adobe Acrobat Reader.
One-click application adds consistent confidentiality marking throughout your document. Professional appearance with optimal size, color, and transparency settings. Perfect for quickly marking sensitive documents for internal distribution.
All stamp processing happens locally in your web browser. Your confidential documents never upload to external servers, ensuring privacy for sensitive materials, internal communications, and documents requiring confidentiality marking.
Perfect for marking draft documents, stamping sensitive internal materials, applying confidentiality notices before distribution, or protecting proprietary information. For custom stamp text, colors, or positioning, use the Add Stamps tool instead. Works with all PDF files from Adobe Acrobat, Microsoft Office, and any source.
Frequently Asked Questions
- Is CONFIDENTIAL Stamp free?
- Yes, completely free with no hidden costs, subscriptions, or usage limits. All tools are available at no charge.
- Is it safe to use CONFIDENTIAL Stamp?
- Yes, 100% safe. All processing happens locally in your browser. Your files are never uploaded to any server and never leave your device.
- What is the maximum file size?
- You can process files up to 100MB. Since everything runs in your browser, processing speed depends on your device.