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How to Use Watermark PDF Online
Follow these simple steps to process your document with maximum privacy and speed:
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Upload your PDF file.
2
Enter your custom watermark text (e.g. 'CONFIDENTIAL', 'DRAFT') or upload a logo image.
3
Configure font size, color, opacity (transparency), and rotation angle.
4
Choose position (Center, Diagonal, or Corners) and page scope (All Pages, Odd, Even).
5
Preview the watermarked result and download.
Why Use PDFToolkit for Watermark PDF?
100% Privacy Guarantee
Your file is never uploaded to remote servers. The algorithm runs locally in your browser memory via WebAssembly.
Instant Processing
Skip long server queues and network bottlenecks. Documents are rendered and transformed at client-side hardware speeds.
Universal Compatibility
Works seamlessly on Google Chrome, Apple Safari, Firefox, and Microsoft Edge across Windows, macOS, Linux, and iOS.