Watermark PDF - Add Text Watermark to PDF Pages
Stamp custom text watermarks across all PDF document pages.
Processed 100% locally in your browser. Your files never leave your device.
About Watermark PDF - Add Text Watermark to PDF Pages
Embeds semi-transparent angled text overlays onto PDF page graphics contexts.
What Can You Use This Tool For?
Students, legal professionals, administrative teams, and business owners use Add Watermark to PDF to quickly manage, convert, and optimize sensitive PDF contracts, assignments, and reports with guaranteed local browser privacy.
How to Add Watermark to PDF
1. Select your PDF document.
2. Enter custom watermark text (e.g. "CONFIDENTIAL", "DRAFT", or company name).
3. Adjust opacity, font size, and rotation angle.
4. Click "Apply Watermark" and download updated PDF.
Usage Examples
Stamping Draft Document
Text: "DRAFT - FOR REVIEW ONLY" Style: 45° Angle, 30% Opacity Result: Semi-transparent watermark stamped across all pages.
Frequently Asked Questions
Are my PDF documents uploaded to a remote server?
No. Unlike traditional PDF conversion sites, Numvax processes PDF documents entirely inside your web browser using WebAssembly and client-side JavaScript. Your confidential files never leave your device.
What is the maximum PDF file size supported?
Because processing occurs in your local browser memory, you can manipulate large multi-page PDF documents smoothly without server upload timeout errors.
Will the formatting and fonts of my PDF be preserved?
Yes, the tool utilizes precision document rendering engines to maintain original text layout, font structures, vector graphics, and embedded images.
Can I process password-protected PDF files?
If a PDF requires a password, unlock it using our Unlock PDF tool first before merging, editing, or splitting.
Can I apply watermarks to specific pages?
You can choose to apply the watermark across all pages or selected page ranges.
Related PDF Utilities
Explore complementary tools and calculators