Add Watermark to PDF

A PDF watermark is a semi-transparent text or image overlay that appears on every page of a document, typically used to indicate ownership, confidentiality, or document status. Common watermarks include words like 'DRAFT', 'CONFIDENTIAL', 'SAMPLE', or a company name. Watermarks help prevent unauthorised reproduction and clearly communicate the status of a document to its readers. Adding them digitally to a PDF is far more efficient than stamping physical copies.