Add Watermark to PDF
Upload a PDF and add custom text watermarks with adjustable opacity, size, and angle.
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Upload a PDF and add custom text watermarks with adjustable opacity, size, and angle.
Watermarking PDFs is an important step for protecting documents, marking drafts, or indicating confidentiality. This tool lets you overlay custom text on every page of a PDF file with full control over appearance. The entire process runs in your browser, so your documents remain private and secure.
You have complete control over your watermark's appearance. Adjust the text content, opacity (from subtle to bold), font size, rotation angle, and color. A diagonal watermark at 30% opacity with gray text is a popular choice for "CONFIDENTIAL" or "DRAFT" markings that remain visible without obscuring the underlying content.
The tool uses the pdf-lib library to draw the watermark text on each page of your PDF. The text is rendered with the specified opacity, size, angle, and color at the center of each page. The original content of the PDF is preserved completely underneath the watermark layer.
All watermarking is done locally in your browser. Your PDF file never leaves your computer, and no data is sent to any server. This makes it safe to watermark sensitive legal, financial, or medical documents.