Text watermark
Stamp diagonal text on pages. Change what is on the page — annotate, label, number or sign it. The file is opened and processed on your own device and never leaves it — you can watch the Network tab and see nothing uploaded.
Frequently asked questions
Is Add Watermark really free and private?
Yes. Add Watermark on hamarapdf is free forever with no login or signup, and it runs entirely inside your browser. Your files are processed on your own device and are never uploaded to any server.
Do my files get uploaded when I use Add Watermark?
No. Unlike cloud tools, Add Watermark does all processing locally in your browser using WebAssembly. You can open your browser's Network tab and confirm that nothing is transmitted — ideal for proprietary designs, draft contracts, blueprints.
How do I use Add Watermark on hamarapdf?
Open the tool, drop your file into the workspace, adjust any options, and download the result. Everything happens on-device, so it also works offline once the page has loaded.
Can I use Add Watermark for sensitive business documents?
Yes — because files never leave your device, Add Watermark is well suited to proprietary designs, draft contracts, blueprints. For fully offline use, the hamarapdf desktop app packages every tool to run without any internet connection.