PDF Watermark
Add a text watermark to every page of a PDF — CONFIDENTIAL, DRAFT, SAMPLE or custom text
Drop a PDF here or click to browse
PDF files only
🔒 Files never leave your browser. Watermarking runs locally using pdf-lib — nothing is uploaded.
When to Use PDF Watermarks
PDF watermarks serve several practical purposes in professional document workflows. A CONFIDENTIAL watermark signals that a document is for internal distribution only and should not be forwarded or shared publicly. A DRAFT watermark indicates that the content is not yet finalized and may change — it prevents recipients from treating the document as authoritative. A SAMPLE watermark is commonly used on preview copies of paid content, templates, or documents shared for review before payment.
Watermarks are also used in legal, finance, and healthcare settings to mark privileged or sensitive documents before they are shared with external parties. The visual marker serves as a reminder to all parties about the document's status and distribution restrictions.
How This Tool Works
This tool uses pdf-lib, a pure JavaScript library for creating and modifying PDF documents. pdf-lib implements the PDF specification directly in JavaScript, allowing it to parse, read, and write PDF files entirely within the browser.
The watermark text is drawn as a new content element on each page using pdf-lib's page.drawText() API with configurable font size, color, opacity, and rotation. No image conversion occurs — the watermark is added as native PDF text content, which keeps file sizes small and ensures crisp rendering at any zoom level.