Yes. Watermark on CS PDF Editor is completely free with no watermarks, usage limits, or account required.

Are my files uploaded when I use Watermark?

No. All PDF processing happens locally in your browser. Your files stay on your device and are never uploaded to our servers.

Do I need to install software for Watermark?

No installation needed. Open the tool in any modern web browser on desktop or mobile and start working immediately.

Add a text watermark to PDF files online for free. Stamp confidential or draft labels across every page in your browser.

CS PDF Editor processes documents on-device. Because files are not uploaded, your sensitive PDFs remain private on your computer or phone.

Yes. Watermark works in mobile browsers on iOS and Android — no app install required.

Stamp a text watermark across every PDF page online for free.

or drop PDFs here

Private — processed in your browser

Follow these quick steps. Your files are processed locally and never uploaded.

Is Watermark free?: Yes. Watermark on CS PDF Editor is completely free with no watermarks, usage limits, or account required.
Are my files uploaded when I use Watermark?: No. All PDF processing happens locally in your browser. Your files stay on your device and are never uploaded to our servers.
Do I need to install software for Watermark?: No installation needed. Open the tool in any modern web browser on desktop or mobile and start working immediately.
What is Watermark used for?: Add a text watermark to PDF files online for free. Stamp confidential or draft labels across every page in your browser.
Is Watermark safe and private?: CS PDF Editor processes documents on-device. Because files are not uploaded, your sensitive PDFs remain private on your computer or phone.
Does Watermark work on mobile?: Yes. Watermark works in mobile browsers on iOS and Android — no app install required.

Free online PDF utilities — merge, split, compress, convert, and more. All private and browser-based.