Add Watermark to PDF — Stamp Custom Text & Confidential Tags
MakeCard PDF Watermark is an in-browser document stamping tool that allows you to apply custom text watermarks—such as "CONFIDENTIAL", "DRAFT", "COPY", "FOR VERIFICATION ONLY", or your company name—across all pages of a PDF document. Featuring a real-time live preview canvas stage on Page 1, you can customize rotation angle, opacity (transparency), font size, and color to protect your intellectual property without obscuring the underlying document text.
How to Use PDF Watermark
Upload your PDF document by dropping it into the upload box or clicking "Choose PDF File".
Watch Page 1 render into the interactive real-time preview canvas.
Type your custom watermark text or click quick presets like "CONFIDENTIAL", "DRAFT", "SAMPLE", or "COPY".
Adjust font size, rotation angle (e.g. 45° diagonal), text color (Red, Gray, Blue, Black), and opacity slider (0.10 to 0.80).
Click "Apply Watermark & Download" to stamp the watermark across all pages and download the secured PDF.
Key Features & Capabilities
- Live Real-Time Visual Preview: See changes to text, size, color, angle, and opacity updated instantly on Page 1 before applying.
- 1-Click Preset Tags: Quick buttons for common business stamps: CONFIDENTIAL, DRAFT, DO NOT COPY, SAMPLE.
- Precise Opacity Control: Dial in subtle transparency (e.g. 15-25%) so the watermark protects the document without blocking readability.
- Standard Helvetica Bold Font Embedding: Crisp vector typography rendered via PDF-Lib across all pages.
- 100% In-Browser Execution: Sensitive proposals and contracts are never uploaded to remote cloud servers.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Supported Input | Any standard .pdf document |
| Watermark Content | Custom alphanumeric text, dates, business names, legal notices |
| Styling Controls | Angle (-90° to +90°), Font Size (16 to 90 pt), Opacity (5% to 90%), Color Palette |
| Engine | Local PDF.js preview + PDF-Lib font embedding and coordinate transformation |
| Output | Stamped .pdf file prefixed with "watermarked-" |
Practical Everyday Use Cases
- Marking draft proposals, tender bids, and price quotations as "DRAFT" or "SAMPLE" before sharing with prospective clients.
- Stamping personal identification scans (PAN Card, Aadhaar, Passport) with "FOR KYC PURPOSE ONLY" to prevent unauthorized identity reuse.
- Protecting educational notes, coaching materials, and e-books with author copyright tags.
- Branding internal company audit reports and board resolutions as "STRICTLY CONFIDENTIAL".
Pro Tips for Best Results
- For KYC identity documents, set the watermark text to "FOR [ORGANIZATION NAME] KYC ONLY" and set opacity to 0.30 diagonally across the image to prevent fraudulent reuse.
- Keep opacity between 0.15 and 0.25 for text-dense documents so readers can easily read the underlying document content.
- A 45-degree diagonal angle is the industry standard for anti-copy and confidential document watermarking.
Common Problems & Solutions
Privacy & Security
100% Client-Side In-Browser Execution
Your document and watermark text are processed entirely inside your local browser memory. MakeCard does not upload, view, or retain your documents on any server.
Frequently Asked Questions
Everything you need to know about using the PDF Watermark