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

Are my files uploaded when I use Sign PDF?

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 Sign PDF?

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

Sign PDF documents online for free. Add a signature line to contracts and forms in your browser — quick and private.

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

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

Add a signature to contracts and forms — quick, private, and free.

or drop PDFs here

Private — processed in your browser

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

Is Sign PDF free?: Yes. Sign PDF on CS PDF Editor is completely free with no watermarks, usage limits, or account required.
Are my files uploaded when I use Sign PDF?: 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 Sign PDF?: No installation needed. Open the tool in any modern web browser on desktop or mobile and start working immediately.
What is Sign PDF used for?: Sign PDF documents online for free. Add a signature line to contracts and forms in your browser — quick and private.
Is Sign PDF 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 Sign PDF work on mobile?: Yes. Sign PDF 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.