About PDF Watermark Tool
Protect and mark your documents with custom text watermarks (CONFIDENTIAL, DRAFT, DO NOT COPY). Adjust opacity, 45-degree rotation angle, font size, and color locally in your browser.
Key Capabilities & Features
- Custom text watermarks with instant preview
- Opacity slider (5% to 100%)
- Adjustable rotation angle (0° to 90°)
- Custom font size control
- Batch watermarking of all document pages
How to Use PDF Watermark Tool
Upload PDF
Select the PDF file you want to watermark.
Set Watermark Text & Style
Enter text (e.g. DRAFT) and adjust opacity and angle.
Download Watermarked PDF
Click Apply Watermark to generate and save your file.
Privacy & In-Browser Execution Guarantee
Watermarking runs entirely on your device. Zero document data is sent to external servers.
Frequently Asked Questions
How does NEOKYRU compare to iLovePDF for this tool?
Unlike iLovePDF which transmits your private documents to third-party cloud servers with strict file size limits and paywalls, NEOKYRU runs 100% client-side in your browser via WebAssembly. Your files never leave your computer, there are no file size caps, zero queue wait times, and it is 100% free with no registration required.
Can the watermark be easily removed by others?
The watermark is rendered directly into the PDF vector stream, making it permanent for standard PDF readers.