Watermark Features How It Works FAQ
verified_user 100% Browser-Based & Secure

Watermark Adder to PDF
Without Uploading

The secure watermark adder to PDF for professionals. Add text or image watermarks — processed entirely in your browser. Your files never leave your device.

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PDF Watermark

Select a PDF, customize your watermark, position it, and save.

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Select PDF file Tap to choose a PDF
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Position & Transform
CONFIDENTIAL
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Drag corner handle to resize/rotate

opacity Opacity: 24%

Watermark Adder to PDF & Image — Create Your Own Watermark Online Free

Looking for the best watermark adder to PDF? UniDoc lets you create your own watermark online free, without uploading files to any server. Whether you need a text stamp or an image overlay, our tool works directly in your browser.

Unlike complex desktop apps or paid alternatives, UniDoc is the simple answer to how to add watermark in pdf for free. You can also use it as a watermark adder to image online free by converting images to PDF first. If you are searching for how to watermark photos online for free, just upload your converted photo PDF and brand it in seconds. Compared to add watermark Soda PDF methods, our tool requires no subscription and keeps all data local.

WATERMARK PDF

How to Add Watermark in PDF for Free

Follow these four simple steps — no installation or registration required.

1

Upload PDF

Select your PDF file from your device. The file stays in your browser.

2

Choose Watermark

Pick between text or image watermark and select a preset or custom design.

3

Customize

Drag, resize, rotate, and adjust opacity until it looks perfect.

4

Download

Save the watermarked PDF directly to your computer in seconds.

Your Files Stay on Your Device

We built UniDoc with privacy at its core. Unlike online tools that upload your documents to remote servers, our watermark adder to PDF processes everything locally inside your web browser.

Your sensitive contracts, financial records, and unpublished designs never leave your computer. We cannot view, store, or share your files because we never receive them.

cloud_off No Server Upload
security 100% Private
lock Local Processing

Features of This Website

Everything you need to watermark your PDFs quickly, securely, and professionally.

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100% Client-Side

All processing happens in your browser. No data is transferred to external servers.

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Text & Image Support

Add any custom text or upload a PNG/JPG logo to use as your watermark.

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Drag & Drop Editor

Visually position your watermark exactly where you want it on the page.

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Opacity & Rotation

Fine-tune transparency, angle, and size to match your document style.

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Tile / Repeat

Optionally tile your watermark across the entire page for full coverage.

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Free to Use

No hidden fees, no registration, and no usage limits in your browser.

Where to Use These Features

UniDoc's watermarking tool is trusted across industries and use cases.

gavel Legal & Contracts

Stamp sensitive legal documents with "CONFIDENTIAL" or "PRIVILEGED" before sharing with outside counsel.

business Business Proposals

Brand proposals and pitches with your company logo to reinforce professionalism and copyright.

design_services Design Mockups

Protect creative work by overlaying "SAMPLE" or "DO NOT COPY" on concept images and proofs.

school Academic Papers

Mark draft thesis papers or research articles as "DRAFT" during peer review stages.

account_balance Government Documents

Classify document sensitivity and prevent unauthorized distribution with clear markings.

photo_camera Photography

Discover how to watermark photos online for free. Protect your image portfolios by converting to PDF and adding your signature.

Frequently Asked Questions

Everything you need to know about adding watermarks with UniDoc.

Simply upload your PDF using the editor above, select whether you want a text or image watermark, customize the appearance using the drag-and-drop canvas, and click "Save Watermarked PDF". It only takes a few seconds.
UniDoc runs entirely in your web browser using advanced client-side JavaScript and PDF-Lib technology. When you upload a PDF, the file is processed locally on your computer. We apply the watermark directly to the PDF data inside your browser and then generate a new, watermarked file for you to download.
Yes. Click the "Image" tab in the editor, upload your PNG or JPG logo, and position it anywhere on the page. You can resize, rotate, and adjust opacity just like a text watermark.
Yes. Click the "Text" tab and enter your desired text. Choose from presets like "CONFIDENTIAL" or "DRAFT", or type your own custom message. You can change the color, font size, rotation, and opacity.
Yes. When you apply a watermark using our tool, it is automatically applied to every page of your PDF document. The tile/repeat option allows you to cover the entire page if needed.
Yes. UniDoc Watermark is completely free to use and safe. Because all processing happens locally in your browser, there is no risk of your files being intercepted, stored, or viewed by third parties.
Absolutely. Your document never leaves your device. We do not upload your PDF to any server. Everything is processed client-side, ensuring maximum privacy and security.
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