Watermark PDF
Stamp text diagonally across every page.
Document Enhancements
Background Color
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Free PDF Watermark Tool
Stamp a semi-transparent diagonal text watermark — like "CONFIDENTIAL," "DRAFT," or your company name — across every page of a PDF. Processing happens locally using pdf-lib, so the document isn't uploaded anywhere to add the watermark.
Useful for marking draft versions of a document before final review, or labeling copies shared for a specific limited purpose.
Frequently Asked Questions
Can I change the watermark's color or size?
Not yet through the interface — the watermark currently renders as gray, semi-transparent, 45-degree text sized to fit the page.
Does the watermark cover up my content?
It's rendered at reduced opacity specifically so the underlying content stays legible underneath.