Add Watermark to PDF — Free & Private
Stamp an image or text over your PDF in seconds. Choose typography, transparency, and position. 100% offline — your files never leave your device.
Drag & Drop Your PDF Here
or click to browse your files
Upgrade Your Note-Taking
Digitize your handwriting instantly with the best-selling Rocketbook Smart Notebook.
How to Add a Watermark in 3 Simple Steps
Upload PDF
Drag and drop your PDF file into the upload area, or click to browse and select a file from your device.
Configure Settings
\nConfigure your text or image watermark. Adjust the opacity, rotation, and position on the grid.
Apply & Download
\nClick the Add Watermark button. Your stamped document is saved as a new PDF and downloaded instantly to your device.
The Complete Guide to Stamping & Watermarking PDF Documents Privately
Protecting intellectual property, preventing unauthorized document distribution, and marking confidential drafts requires adding clear visual watermarks to PDF files. The MyPDF Watermark PDF tool allows you to stamp custom text stamps (such as "CONFIDENTIAL", "DRAFT", or "DO NOT COPY") or brand logo images onto any document—100% inside your web browser.
Customizing Text & Image Watermark Parameters
- Text Watermarking: Customize font family, size, color, rotation angle (45°, 90°, 270°), and opacity levels to ensure readability without obscuring document content.
- Logo & Image Watermarking: Upload company PNG or JPG logos, adjust transparency layers, and position images anywhere on the 9-point grid.
- Mosaic Pattern Layout: Enable full-page diagonal mosaic repeating patterns for maximum anti-piracy protection.
Why Local Browser Watermarking Protects Copyrights
Uploading confidential manuscripts, patent applications, or unreleased designs to cloud-based watermark tools subjects your files to remote database storage risks. MyPDF embeds vector watermarks into PDF page streams using WebAssembly and PDF-Lib directly inside your local CPU memory.
| Feature | MyPDF Local Watermarker | Cloud Online Stamping |
|---|---|---|
| Document Privacy | 100% In-Browser Local Execution | Files uploaded to remote servers |
| Customization Options | Full Grid Positioning, Rotation & Mosaic Mode | Basic fixed placement |
| Watermark Removal Risk | Stamped vector layers fused into stream | Overlay layers easily removed |
Need to lock or sign stamped files? Check out our PDF Locker, PDF Signer, PDF Merger, or PDF Compressor.
Frequently Asked Questions About PDF Watermarks
Is it safe to watermark PDFs online?
Yes, with MyPDF it is completely safe. Unlike other online tools, your files are processed entirely in your browser using JavaScript. Nothing is uploaded to any server. Your documents stay on your device at all times.
Can I use an image as a watermark?
Yes. You can toggle between Text and Image modes. In Image mode, you can upload a JPG or PNG file (like a company logo) to stamp onto your document.
Will the watermark reduce PDF quality?
No. MyPDF stamps the vector text or image directly onto the existing document layer without re-rendering or compressing the original pages, preserving 100% quality.
Does this work on mobile devices?
Yes. The split tool works on any device with a modern browser — iPhones, Android phones, iPads, tablets, and desktop computers. No app installation required.
Is there a file size or page limit?
No artificial limits. Since processing happens in your browser, the only limitation is your device's available memory. PDFs with hundreds of pages work without issues on most devices.
