FileFryer PDF Watermark
Stamp confidential notices, copyright text, or custom logos across every page of your PDF with live visual preview. 100% private in your browser.
Private, High-Fidelity PDF Watermarking Across Every Page
Stamp custom text notices or high-resolution PNG brand logos across every page of your PDF in seconds with 100% in-browser privacy.
Dual Mode: Text & Transparent Logo Stamps
Type standard copyright notices with custom hex colors and font sizes or embed transparent company PNG logos for branded document delivery.
9-Point Alignment + Diagonal Tiled Pattern
Place subtle notices in corners or headers, or switch to the repeating tiled mode to blanket the entire page with diagonal protection against screenshot theft.
Real-Time In-Browser Preview
Inspect font sizes, rotation angles, and transparency against your actual PDF content page-by-page before producing the final download.
Zero Server Uploads & Zero Storage
All PDF rendering and PDF stream compilation is performed locally on your device. Complete confidentiality for contracts, medical records, and financial statements.
Selective Page Range Stamping
Stamp your watermark across all pages simultaneously or restrict it to custom page ranges like covers, annexes, or executive summaries.
Custom Opacity, Colors & Angles
Fine-tune watermark transparency, select brand hex colors, and tilt text or logos from -90° to +90° for optimal readability and security.
How to Add a Watermark to a PDF in 3 Simple Steps
Follow these simple steps to watermark your PDF documents:
Upload Your PDF
Drag and drop your PDF into the upload container. FileFryer immediately loads the document and generates a live interactive preview of the first page.
Customize Watermark
Choose between custom text (like CONFIDENTIAL, DRAFT, DO NOT COPY) or upload a transparent PNG logo. Adjust opacity, angle, size, and snap to any of the 9 alignment positions or repeat across the whole page in a diagonal tiled grid.
Export Stamped PDF
Click "Stamp Watermark on All Pages" to compile the new document. Download your protected PDF with zero loss in text sharpness, vector quality, or layout clarity.
Client-Side Offline Processing & Zero Server Uploads
All PDF rendering and PDF stream compilation is performed locally on your device. Complete confidentiality for contracts, medical records, and financial statements.
Frequently Asked Questions (FAQ)
Common questions about watermarking PDFs offline.
Will watermarking my PDF affect existing text and formatting?
No. FileFryer stamps the watermark as an overlaid vector or image layer directly onto each page canvas without modifying or rasterizing your underlying PDF vector text, tables, or embedded images.
Can I apply the watermark to only specific pages?
Yes! You can choose "All Pages" to stamp every page in the document, or select "Custom Pages" and specify exact page ranges (e.g. 1-3, 5).
What image formats can I use for a watermark logo?
You can upload transparent PNG, JPG, or WebP files. Transparent PNGs work best because they blend seamlessly over the document text without a white rectangular background.
Are my files kept secure and private?
Yes, 100%. FileFryer operates completely on the client-side. No PDF files, images, or document data are ever sent over the internet or uploaded to remote cloud servers.
What is the advantage of a diagonal tiled watermark?
A single corner stamp can often be cropped out. A repeating diagonal tiled watermark blankets the entire document, preventing unauthorized screenshotting and document theft.
Can I adjust the transparency so text behind the watermark remains readable?
Yes. You can adjust the opacity slider from 5% to 100%. Setting opacity between 15% and 30% keeps your watermark clearly noticeable while ensuring all underlying text and figures remain legible.