Watermark PDF — free, private, in your browser

Stamp diagonal text like CONFIDENTIAL or DRAFT across every page. Unlike iLovePDF or Smallpdf, nothing is uploaded: the processing happens on your own device, so the tool works even with the Wi-Fi off.

Watermark PDF now — no sign-up →

How it works

  1. 1Drop a PDF onto the page
  2. 2Type the watermark text and tune opacity/size
  3. 3Download the watermarked PDF

Questions

Are my files uploaded?

No. CommandEditor runs entirely in your browser with WebAssembly — your file never leaves your device. You can verify it: open your browser's network inspector, or switch off Wi-Fi after the page loads; the tool still works.

Can I watermark only some pages?

The watermark applies to all pages by design — for selective page text use the Header & Footer or Edit tools.

Related tools

PDF Header & FooterAdd Page Numbers to PDFPassword Protect PDF

CommandEditor is open source and free forever. 114 tools, 60+ voice commands, on-device AI — your files never leave your device.