Watermark PDF
Stamp a diagonal text watermark on every PDF page in your browser — nothing is uploaded.
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Add a watermark to a PDF online
Load a PDF, type your watermark text, set the opacity and font size, and download the stamped file. The watermark is drawn diagonally across every page using pdf-lib — entirely in your browser, no upload required.
FAQ
Is my PDF uploaded anywhere? No — processing is entirely local in your browser.
Can I adjust the watermark transparency? Yes — use the opacity slider from 0 (invisible) to 1 (fully opaque).