PDF Watermark
Stamp text watermarks across every page of a PDF. Useful for "CONFIDENTIAL", "DRAFT", company names, dates, and more.
How to Use
Drag or click to load a PDF. The same watermark is applied to every page.
Pick text, color, opacity, rotation (usually −45° diagonal), and font size. The preview updates live.
Hit "Apply" to download the watermarked PDF.
FAQ
Does Korean / Japanese text render correctly?
Yes. The tool draws text on a canvas as PNG and inserts the PNG into each PDF page — no PDF font embedding required, so Korean, Japanese, emoji, and symbols all render perfectly.
Can I have multi-line watermarks?
Yes — newlines split into multiple lines. Example: "CONFIDENTIAL\n2026-04-27\nCompany name".
Why a diagonal watermark?
Diagonal (−45°) or horizontal placement is standard for "CONFIDENTIAL", "DRAFT", and corporate stamps in business documents.
Are encrypted PDFs supported?
Password-protected PDFs must be unlocked first. This tool does not handle PDF encryption.
Is anything sent to a server?
No. Everything is processed in your browser via pdf-lib; the file never leaves your machine.
