Add Custom Text Watermark to PDF
Protect your intellectual property by applying customizable text watermarks across every page of your PDF documents. Customize watermark text, opacity, font size, rotation angle, and placement directly in your browser without uploading confidential files to the cloud. Stamp copyright notices and confidential tags securely.
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Step-by-Step Guide: How to Use Add Watermark Online
- 1Upload your PDF file.
- 2Type your watermark text (e.g., 'CONFIDENTIAL', 'DRAFT', or company name).
- 3Adjust opacity, font size, and rotation angle.
- 4Click 'Apply Watermark & Download'.
Add Watermark Features & Capabilities
- Custom watermark text, font size, and color
- Adjustable opacity and rotation angle (diagonal 45° or horizontal)
- Applies uniformly across all pages in the PDF document
- Private in-browser stamping with zero server uploads
Technical Specifications & Privacy Standards
| Supported Formats | |
| Execution Architecture | 100% Client-Side WebAssembly & HTML5 Canvas (Local CPU/GPU) |
| Server File Transfer | 0 Bytes Transferred (Zero Cloud Uploads) |
| Output Quality | Lossless Vector & Original Resolution Maintained |
| Compatibility | Cross-Platform (Windows, macOS, Linux, iOS, Android) |
Your files are processed locally in your browser memory and are not uploaded to our file-processing servers.
Add Watermark FAQ
Can I customize the watermark opacity, angle, and text color?
Yes. You have full control over font size, opacity transparency, rotation angle (e.g. 45 degrees diagonal), color, and page positioning.
Does watermarking affect the underlying text and graphics?
No. The watermark is stamped as an overlay layer, leaving your original text, vector lines, and embedded images completely unharmed.
Can watermarks be added to specific pages only?
You can choose to stamp every page across the entire document or specify targeted page ranges for copyright and confidentiality notices.
Can someone easily erase the watermark from the PDF?
The watermark is baked into the document's content streams, preventing casual removal in standard PDF reader applications.
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