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Add Watermark to PDF
Stamp text diagonally across every page of a PDF.
About the Add Watermark to PDF
This is a free, browser-based file tool on ToolsFlow. Stamp text diagonally across every page of a PDF. There's nothing to install and nothing to sign up for — open the page, do the task, and you're done.
Frequently Asked Questions
Is the Add Watermark to PDF free to use?
Yes. It’s completely free, with no signup, subscription, or usage limits.
Do I need to install anything or create an account?
No. It runs entirely in your web browser — there's no software to install and no account required.
Is my data safe when I use this tool?
Yes. It runs client-side in your browser, so your files and text are processed on your own device and are never uploaded to a server.
Does it work on mobile devices?
Yes. It works on any modern browser, on phone, tablet, or desktop.
What does this tool actually do?
Stamp text diagonally across every page of a PDF.