Add Watermark to PDF

What Add Watermark to PDF does

This tool adds a custom text watermark across every page of a PDF, with adjustable font size, processed entirely in your browser without uploading the document.

How to use it

1. Choose a PDF file.
2. Enter the watermark text and choose a font size.
3. Click Add Watermark and download the watermarked file.

Common uses

• Marking a draft document clearly as "DRAFT" or "CONFIDENTIAL" before sharing.
• Adding a copyright notice or company name across pages of a distributed document.
• Labeling a sample or preview PDF to prevent it from being mistaken for a final version.
• Watermarking a document shared for review before a final, clean version is released.
• Adding a "Not for Distribution" marker to internal-only documents.

Good to know

The watermark is applied as a visible text overlay on every page — it's a useful visual deterrent and labeling method, but it isn't a security or DRM feature, since watermark text can still potentially be edited out with dedicated PDF editing software by someone determined enough to try.

Digital watermarking as a concept predates PDFs entirely, tracing back to physical paper watermarks used for centuries to mark official documents and prevent counterfeiting — the modern text-overlay version serves a similar labeling purpose, even though, unlike a paper watermark pressed into the fibers of the page, a digital text overlay is fundamentally more removable by anyone with PDF editing tools.