Watermark PDF

Add text watermarks to PDF pages. Customize text, size, opacity, and position. Free, runs in your browser.

Free No signup Files stay on your device Instant

Drag & drop your file here, or click to browse

Accepts PDF

Done!

How to Watermark PDF

1

Upload your PDF

Drag and drop your PDF or click to browse.
2

Configure watermark

Enter watermark text and customize size, opacity, color, and position.
3

Apply and download

Click "Watermark PDF" to apply the watermark to all pages.

How do I add a watermark to a PDF?

Upload your PDF, enter your watermark text, adjust the settings, and click Apply. The watermark is added to every page in your browser.

Is it safe to watermark PDFs online?

Yes. ChangeThisFile processes PDFs entirely in your browser. Your file never leaves your device.

Can I customize the watermark appearance?

Yes. You can set the text, font size, opacity, color, and position (center, diagonal, top, bottom).

Does the watermark apply to all pages?

Yes. The watermark is added to every page in your PDF document automatically.

Is my PDF uploaded to a server?

No. PDF watermarking runs entirely in your browser using pdf-lib. Your file never leaves your device.

Add text watermarks to PDF pages. Customize text, size, opacity, and position. Free, runs in your browser.