Add Watermark to PDF Online Free

Add custom text watermarks to protect your documents

Drop PDF to watermark

Add custom text or logo watermark with live preview & multi-angle rotation

Up to 150.00 MB per file • Single file

Processed 100% locally in your browser. Your files never leave your device.

Processed 100% locally in your browser

Your files never leave your device. Zero server uploads.

How It Works

Upload PDF

Open the PDF you want to valid/stamp.

Customize Watermark

Type your text, choose color, rotation, and opacity settings.

Apply

Download the stamped PDF with your custom watermark applied to all pages.

Frequently Asked Questions

Quick answers about this tool

Can I customize the watermark appearance?▼

Yes! Adjust text, font size, opacity, and rotation angle to create your perfect watermark.

Is the watermark applied to all pages?▼

Yes, the watermark is automatically applied to every page of your PDF.

Can I add image watermarks?▼

Currently we support text watermarks. Image watermarks may be added in a future update.

Can watermarks be removed later?▼

Watermarks are permanently embedded in the PDF. Keep your original if you need an unmarked version.

About This Tool

Add watermarks to PDF documents with our free PDF watermark tool. Protect intellectual property, brand documents, or mark status with custom text watermarks. Our PDF watermarking tool lets you customize text, font size, opacity, color, and rotation angle. Apply watermarks like "CONFIDENTIAL", "DRAFT", "SAMPLE", or company names to all pages automatically. Perfect for protecting PDFs, branding proposals, or marking document status. Watermarks are permanently embedded and visible on every page. The browser-based tool processes files offline – zero uploads, complete security.

Why Choose AeroPDF?

100% Private

Processed entirely in your browser with no cloud uploads.

Instant Speed

No waiting for slow server roundtrips or queues.

Any Device

Works smoothly on Windows, Mac, iOS, and Android.

Key Features

Custom text watermarks (e.g., CONFIDENTIAL)

Adjust size, color, rotation, and opacity

Apply to all pages instantly

Protect intellectual property

Browser-based security

Step-by-Step Tutorial & Security Guide

How to Add Watermarks to PDF Documents (Confidential & Draft)

Read Guide

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