The PDF Watermark tool lets you add custom text watermarks to any PDF document to protect your intellectual property, communicate document status, or reinforce your brand identity. Watermarks such as CONFIDENTIAL, DRAFT, APPROVED, or your company name discourage unauthorized copying and make the purpose of a document instantly clear to anyone who opens it. This is invaluable for legal teams, designers sharing proofs, photographers distributing previews, consultants delivering reports, and educators sharing exclusive materials. The tool works entirely in your browser, meaning your files stay private and are never uploaded to any server. You can control the watermark text and see it applied to every page of the document with a single action. The resulting file remains a standard PDF that can be opened by any reader, printed, and shared normally, but with your chosen mark visible throughout. Adding watermarks also helps distinguish between different versions of a document, making it easier to track revisions and prevent old drafts from being mistaken for finalized copies. Because the process is instant, you can watermark long documents in seconds without waiting on slow uploads or downloads. There are no signup requirements, no page limits, and no branding added by the service itself, making the tool suitable for both personal and professional use. With the PDF Watermark, you gain a fast, private, and reliable way to safeguard and label your important documents.