PDF Watermark
Add customizable text and stamp watermarks to PDF pages with real-time interactive preview. Adjust rotation, font, opacity, placement, and page ranges 100% client-side.
Drop your PDF file here, or browse
Upload any PDF document up to 100 MB to configure and preview your watermark.
True Vector Embedding
Watermarks are injected as native vector font streams. They never degrade text quality or balloon file sizes.
Live Interactive Canvas
Inspect changes to opacity, rotation angle, position, and color in real time before generating your final document.
Complete Document Privacy
All PDF rendering and watermarking are executed locally in browser memory. Confidential documents never leave your browser.
Watermarking Best Practices
Tiled Pattern for Maximum Protection
Use the 'Full Page Tiled' position to create an impossible-to-crop repeated pattern across the entire document canvas.
Subtle Opacity for Readability
An opacity between 15% and 30% ensures the watermark protects your ownership while preserving full readability of the text underneath.
Selective Page Targeting
Target only the first page for cover letters and executive summaries, or specify custom page ranges (e.g. '1-3, 5, 8-10').
Native Vector Embedding
All watermarks are embedded as true vector PDF objects. They never rasterize or blur, regardless of zoom level or print resolution.
How it works?
Upload PDF File
Drop any PDF document up to 100 MB into the secure browser workspace.
Customize Watermark
Choose preset or custom text, font, font size, angle, opacity, color, and positioning.
Real-Time Preview
Inspect the live watermark overlay on your document pages with instant visual feedback.
Apply & Download
Export the watermarked PDF in vector quality with 100% in-browser privacy.
Frequently Asked Questions
How does PDF Watermark embed watermarks?
Our tool uses pdf-lib to directly inject vector text objects into the PDF page content stream. This preserves the original resolution, vector paths, and embedded fonts without converting pages to raster images.
What is the difference between Center Diagonal and Full Page Tiled?
Center Diagonal places a single bold watermark across the middle of the page at a diagonal angle. Full Page Tiled repeats the watermark in a uniform grid pattern across the entire page, making it impossible to crop out.
Can I watermark only specific pages of my document?
Yes! Use the 'Apply to Pages' setting to select All Pages, First Page Only, Odd Pages, Even Pages, or a custom range (such as '1-5, 8').
Are my sensitive or proprietary PDFs uploaded to any server?
No. Everything runs strictly inside your web browser. Neither your document text, images, nor watermarks ever leave your device.
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