Add Watermark to PDF
Drop in a PDF, type your watermark text, and pick a position, color, size and opacity. The watermark is drawn on every page using a built-in Helvetica font. Choose "Center diagonal" to get the classic 45° draft/confidential stamp, or any of the edge positions for a header/footer style. Everything runs locally — your file is never uploaded.
Drop .pdf file here
or click to choose
Options
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Supports
.pdf → .pdf
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Frequently asked
Is Add Watermark to PDF free to use?
Yes. Add Watermark to PDF is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — Add Watermark to PDF runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does Add Watermark to PDF work?
Open Add Watermark to PDF, drop in your PDF file, choose any options, and click Convert. Your browser does the work locally and produces a PDF file you can save right away.
What's the maximum file size for Add Watermark to PDF?
Because Add Watermark to PDF runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.