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Add Watermark to PDF
Stamp a diagonal text watermark across every page of a PDF.
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Click to upload or drop a file
Processed locally in your browser — never uploaded.
Stamps a diagonal text watermark on every page with pdf-lib — your PDF never leaves your browser.
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
Where does the watermark go?＋
A diagonal text watermark is centered on every page, with adjustable size and opacity.
Is my PDF uploaded?＋
No — the watermark is added locally with pdf-lib; your file never leaves your device.