Add Watermark to PDF is a free online tool that lets you protect your documents with custom text watermarks like 'Confidential', 'Draft', or 'Sample'. WayPDF adds watermarks entirely in your browser — your files never leave your device, making it the most secure way to mark sensitive documents.

Common use cases include marking contract drafts as 'Draft — Not for Distribution', stamping client deliverables as 'Sample', adding 'Confidential' labels to internal documents, branding shared PDFs with company names, and protecting preview copies sent to prospective clients. Customize the watermark text, opacity, and rotation to suit your needs.

Browser-based watermarking ensures your document content and the watermark are processed entirely on your device. There's no risk of data interception or server-side storage of your sensitive materials.