A PDF watermark is a text or image overlay placed on document pages to indicate ownership, confidentiality, or document status. Watermarks are commonly used for branding company documents, marking drafts as DRAFT or CONFIDENTIAL, adding copyright notices to shared materials, and protecting intellectual property from unauthorized redistribution. A well-placed watermark deters misuse while still allowing the document content to be read clearly.

Our free online PDF watermark tool lets you add custom text watermarks to any PDF document directly in your browser. Set your watermark text, choose the font size, color, opacity, and rotation angle, then apply it to all pages or selected pages of your document. The tool preserves the original document quality and structure while embedding the watermark. All processing happens locally on your device, so your documents and watermark settings never leave your computer.