PDF Watermark

PDF Watermark lets you stamp every page of a PDF with a text label or a logo image. This is useful for marking a draft document before sharing with reviewers, adding a CONFIDENTIAL designation before circulating internally, branding a white paper with your company logo before publishing, or adding a diagonal DO NOT COPY warning before sending a sensitive document. The tool supports two watermark types. Text watermarks let you type any message, choose a colour (via a colour picker), set the opacity from barely visible (0.1) to nearly opaque (0.9), pick a font size, and set a rotation angle — the classic diagonal watermark across the centre of each page is 45 degrees. Image watermarks let you upload a PNG or JPEG logo file, which is then tiled across each page at a configurable opacity. In both cases, the watermark is applied to every page of the PDF. The watermark pattern is tiled — repeated at regular intervals across each page — so it covers the full page area regardless of page size. The watermark content (text or image) is embedded directly into the PDF as part of the page content stream, meaning it cannot be easily removed by the recipient — unlike a transparent overlay that some tools add, which can be toggled off in a PDF reader. Because the operation modifies the page content, it is more resource-intensive than simple operations like page counting or rotation. For very large documents (hundreds of pages), the watermarking may take a moment. The tool shows a Processing indicator so you know it is working. All processing runs locally in your browser. Your PDF, your watermark image (if any), and the output file never leave your device.