Add a text watermark to your PDF
Click or drop a PDF here
PDF Watermark stamps a diagonal, semi-transparent text watermark across the center of every page, using the pdf-lib library entirely in your browser — your file is never uploaded to a server. You can customize the text and its opacity; there's no image watermark option, and the rotation (45°), color (gray), and position (page center) are fixed.
Is PDF Watermark free to use?
Yes, it's completely free with no signup required.
Can I add an image watermark, like a logo?
No — only text watermarks are supported; there's no option to upload an image.
Can I change the watermark's color, angle, or position?
No — the watermark is always gray, rotated 45°, and centered on the page. Only the text and opacity are adjustable.
Can I watermark multiple PDFs at once?
No, only one file at a time — upload and process additional files separately.