Can this remove an existing watermark?

No. It writes new content and cannot reliably remove someone else's watermark.

Do signatures remain valid?

No. Editing invalidates existing digital signatures.

Add PDF Watermark

Add text watermarks to every PDF page with local color, opacity and rotation controls.

Privacy: all processing happens locally in your browser. Your input never leaves your device.

What is Add PDF Watermark?

Mark pages as Draft, Confidential or with an organization name. Text is rendered to a local canvas image before embedding, so Chinese and other browser-supported scripts do not depend on PDF font encoding. Keep the original because the output has permanent watermarks.

How to Use

Choose a PDF
Set text, color, opacity and rotation
Create and download the watermarked PDF

FAQ

Can this remove an existing watermark?: No. It writes new content and cannot reliably remove someone else's watermark.
Are files uploaded?: No.
Do signatures remain valid?: No. Editing invalidates existing digital signatures.

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Last updated 2026-09-15