Add Watermark to PDF Online Free
or drop PDF file here · Supports PDF · Up to 90MB
How Watermark PDF Pages Works
Fast, private in-browser document processing engineered with enterprise-grade accuracy.
Upload PDF
Select the PDF file you wish to protect with a watermark.
Customize Watermark
Type your watermark text (e.g., CONFIDENTIAL) and configure opacity, rotation, and color.
Apply & Download
The watermark is injected behind existing page content on all or selected pages.
Subtle Background Placement
Rendered behind text content so documents remain fully legible.
Opacity & Angle Controls
Fine-tune transparency (15% opacity) and 45-degree diagonal rotation.
Custom Colors & Sizing
Choose font point sizes and hex colors (e.g., subtle gray or light red).
Selective Page Application
Apply watermarks across the entire document or target specific sections.
Frequently Asked Questions
Everything you need to know about formats, browser privacy, and file handling.
How do I add a text watermark ('CONFIDENTIAL' or 'DRAFT') across PDF pages?▼
Upload your PDF, enter your desired watermark text (such as 'CONFIDENTIAL', 'SAMPLE', or 'DO NOT COPY'), adjust the rotation angle (45 degrees diagonal) and opacity, then click Apply to download your watermarked document.
Can I use an image or company logo as a semi-transparent PDF watermark?▼
Yes. You can upload a PNG, SVG, or JPG logo. By adjusting the opacity slider (e.g., 15% to 30%), your logo acts as an elegant, non-intrusive watermark behind your document text.
How do I customize watermark opacity, font size, angle, and position?▼
Our visual options panel allows you to customize font family, text size, color (gray, red, blue, etc.), transparency level, diagonal angle, and page alignment (center, top, bottom, or tiled across the page).
Can I apply the watermark to specific pages instead of every page?▼
Yes. You can specify a custom page range (such as '2-10' or 'odd pages only') to prevent watermarking your cover page or signature appendix.
Is it possible to place the watermark behind the text or on top of content?▼
Yes. You can choose 'Under content' (places watermark as a background layer behind text so readability is maximized) or 'Over content' (draws watermark on top to prevent cropping or screenshot tampering).
Can recipients easily edit or remove the watermark from the PDF?▼
To prevent easy removal in third-party editors, pair your watermarked document with our 'Flatten PDF' tool. Flattening merges the watermark permanently into the document's base layer.
Does adding a watermark increase the PDF file size significantly?▼
Text watermarks add less than 2 KB to the overall file size because font vectors are reused. Image watermarks add only the lightweight compressed size of the uploaded image asset.
Can I watermark password-protected PDF documents?▼
Yes, by entering the document password to unlock the file during processing. You can maintain or re-apply password encryption after watermarking.
Can I add dynamic watermarks like dates, times, or email addresses?▼
Yes. You can use dynamic variables like {date}, {time}, and {recipient_email} in the watermark text input to automatically stamp the exact timestamp of distribution.
Are my uploaded files protected and kept confidential during watermarking?▼
Yes. All watermarking processing takes place in memory on secure isolated servers, and documents are erased immediately upon download completion.
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