How to Add a Watermark to a PDF for Free

Protecting your intellectual property has never been easier. With our Add Watermark to PDF tool, you can securely stamp text or custom image logos across your PDF documents directly in your web browser. Whether you are adding a "CONFIDENTIAL" stamp, a "DRAFT" diagonal overlay, or your company's transparent PNG logo, this visual designer gives you complete control over font size, opacity, rotation, and exact placement.

100% Private

Files never leave your device. All processing happens in your browser.

Instant Rendering

See your watermark changes instantly on a live visual preview.

No Quality Loss

Downloads instantly in full quality without altering original content.

Why Watermark Your Documents?

Adding a watermark is an essential step in digital document security. It deters unauthorized sharing, establishes ownership, and clearly marks the status of a document (like "Draft" or "Approved"). By using client-side processing, our tool ensures that highly sensitive corporate documents can be watermarked without ever being uploaded to a third-party server, guaranteeing absolute privacy and compliance with data security policies.

Frequently Asked Questions

Are my PDF files uploaded to your servers?

No. This tool is built using next-generation client-side technologies. Your PDF is processed entirely inside your own web browser's memory. No files are ever uploaded, saved, or stored on our servers.

Can I use an image as a watermark instead of text?

Yes! You can switch to the 'Image Logo' tab in the designer and upload any PNG or JPG image. We even have a built-in toggle to automatically remove solid white backgrounds from logos.

How do I make a diagonal watermark across the page?

Simply use the 'Angle Rotation' slider in the designer panel. Setting it to 45° or -45° will create a perfect diagonal watermark. You can then use the font-size slider to make it span the entire page.

Can I apply the watermark to only specific pages?

Absolutely. Scroll down to the 'Page Distribution Selector' where you can choose to stamp only the first page, only the last page, or a custom range (e.g., '1-3, 5').