How to Add Watermarks to PDF & Images Online Free (Batch Text & Logo Stamping)

Prevent unauthorized distribution and copyright theft by stamping confidential text watermarks or company logos across your PDF documents and photo files. iEditPDF provides full control over font size, color, opacity, diagonal rotation, and tiled repeat patterns—100% free with zero cloud uploads.

Verified for 2026 Portals & Workflows•100% Client-Side Privacy•Updated: 2026-09-22

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Use the Free Watermark PDF Online

No installation, no account creation, and zero server uploads. Your files are processed securely inside your browser.

Free Forever Complete Privacy Instant Speed

Open Watermark PDF Studio (100% Free)

Step-by-Step Instructions

4 Easy Steps

Select Your PDF Document or Image Batch

Open the Watermark tool and drag your PDF document or images into the workspace. The tool renders high-resolution live previews in real time.

Open Watermark PDF Tool Online

Pro Tip: You can watermark single contracts or batch process multiple pages simultaneously.

Choose Text Watermark or Image Logo Stamp

Select 'Text Stamp' to type words like 'CONFIDENTIAL', 'DRAFT', or your company name. Alternatively, select 'Image Stamp' to upload your high-res transparent PNG brand logo.

Pro Tip: For copyright notices, include the © symbol and your business name or URL.

Configure Opacity, Rotation, and Tiling Layout

Adjust the transparency slider between 15% (subtle background mark) and 50% (clear ownership stamp). Set the rotation angle to 45° and enable 'Tile Pattern' to cover the whole document diagonally.

Pro Tip: Tiled 45-degree patterns prevent bad actors from cropping out corner logos.

Preview Live Stamp & Download Watermarked Files

Review the live canvas preview across every page. Click 'Save Watermarked PDF' or 'Download Images' to export the secured files immediately with zero server delays.

Pro Tip: To permanently lock watermarks and prevent removal by other PDF editors, run the file through our Flatten PDF tool.

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Start in the Watermark PDF Studio Now

Zero account registration, zero watermarks, and 100% client-side privacy on your device.

Open Watermark PDF Studio

Why Use iEditPDF for This Task?

Universal Watermarking: stamp both multi-page PDF documents and graphic images (JPG, PNG, WebP)

Tiled Pattern Protection: repeat watermarks across the entire page diagonally to stop cropping theft

Precision Opacity & Angle Sliders: adjust transparency from subtle 15% watermark to prominent stamps

100% Client-Side Privacy: confidential agreements and unreleased product photos never touch a remote server

Technical Walkthrough Verified

Written & Code-Audited by Vipul Ravindra Sukhdeve

VNIT Nagpur Graduate • JNV Gondia Alumnus • WebAssembly & Privacy Systems Architect

GitHub Profile Twitter / X

Frequently Asked Questions

Can I watermark both PDF documents and photo files (JPG/PNG)?

Yes! iEditPDF supports stamping watermarks onto multi-page PDF contracts as well as image formats like JPG, PNG, and WebP, making it ideal for both business documents and photography portfolios.

What is the benefit of a tiled watermark over a single center stamp?

A single watermark placed in the center or corner can often be cropped out or obscured. Tiling repeats the stamp diagonally across the entire surface of each page, ensuring that no section can be reused without displaying your copyright.

Can someone easily remove the watermark using an online editor?

To ensure your watermark is irreversible, we recommend chaining the Watermark tool with our Flatten PDF tool. Flattening converts the watermark annotations and text layers into an uneditable static graphic, locking it permanently into the document.

Are my confidential files uploaded to any server during watermarking?

Never. Watermark rendering, canvas composition, and PDF re-encoding take place entirely inside your device's browser memory via WebAssembly. Your proprietary files remain 100% private.