Add Watermark to PDF

The tool uses a custom FPDI subclass that adds true transparency support to the underlying FPDF engine via the PDF specification's ExtGState mechanism, since transparent text isn't something the base library supports out of the box.

Each selected page is imported as a template, and the watermark text is drawn on top at your chosen rotation angle using a rotated text-matrix transform, calculated so the text is visually centered on the page regardless of the angle chosen.

You control the opacity (5–100%), font size, hex color, rotation angle, and which pages receive the watermark (all, specific numbers, ranges, or odd/even) — the text is rendered as real vector text, not a flattened image, so it stays sharp at any zoom level.

Your files are uploaded over an encrypted (SSL) connection. We don't store, read, or share the contents of your files — they're processed to generate your result and are not retained on our servers afterward.

• Marking a draft document "DRAFT" or "CONFIDENTIAL" before circulating it for review.
• Adding a company logo or name as a watermark to branded documents.
• Marking sample or preview documents to discourage unauthorized redistribution.

• Setting watermark opacity too high, which can make the underlying text hard to read — a subtle, semi-transparent watermark is usually more practical than a bold, opaque one.
• Forgetting a watermark is not a security measure — it deters casual copying but can be removed by someone determined; use Protect PDF if you actually need access control.

• A diagonal watermark across the page is the most common style because it's visible without obscuring any single line of text entirely.
• Test the watermark on one sample page before applying it to a long document, to check placement and opacity.

We respect your privacy. All files are processed securely and are never sold, shared, or used for anything beyond generating your result.