PDF Add Watermark Tool

How to Use This Tool

1. Drop or browse for one PDF.
2. Enter watermark text, customize size, opacity, color, and rotation.
3. Click Add Watermark and download the updated PDF.

Common Use Cases

• Marking drafts with "DRAFT" watermark
• Adding "CONFIDENTIAL" labels to sensitive documents
• Branding shared documents with company name
• Adding "SAMPLE" or "COPY" to example documents

Tips for Best Results

• Low opacity (0.10-0.20) works best for readable documents.
• A diagonal angle (-35° to -45°) is the most common professional watermark style.
• Use a large font size (40-60) for full-page watermarks.

Frequently Asked Questions

Can I add an image watermark?

Currently only text watermarks are supported. Image watermarking may be added in the future.

Can I watermark specific pages only?

Currently the watermark is applied to all pages. Use Split → Watermark → Merge for selective watermarking.

Important Notes

• This tool applies text-based watermarks.
• Opacity and rotation settings apply to every page.
• Watermark color can be customized via the color picker.
• All tools run fully in your browser. Your files are not sent to our server.
• Safe and free to use: no login, no signup, no paywall.
• Libraries used: PDF-Lib (MIT), PDF.js (Apache 2.0), Mammoth.js (BSD-2), JSZip (MIT).
• If you find a bug, please report it in the comments.

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