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Learn how to stamp text, confidential labels, or copyright notices on your PDF files instantly. 100% free, private, and works in your browser.
Do you need to protect your intellectual property or label a document as "CONFIDENTIAL" or "DRAFT"? Adding a watermark to a PDF is the standard way to protect documents, but editing PDFs usually requires expensive software like Adobe Acrobat Pro.
Not anymore.
With ModifyPDF, you can add custom text watermarks to your PDF files directly in your web browser. It’s completely free, requires no sign-up, and most importantly—it's 100% private.
In this guide, we’ll show you exactly how to stamp your documents in seconds.
Before we look at how, let's look at why professionals watermark their files:
We designed our Add Watermark Tool to be the fastest way to edit PDFs on the web. Here is the simple 3-step process:
Go to the Add Watermark page. Drag and drop your PDF file into the box, or tap the button to select a file from your computer or mobile device.
Once your file loads, you will see a live preview of your document. Use the settings panel to customize your watermark:
Click the "Apply Watermark" button. Our tool processes the file instantly. Once done, click Download to save your new, protected PDF.
There are many online PDF tools, but ModifyPDF is unique for one reason: Privacy.
Most online PDF editors require you to upload your sensitive files to their servers to be processed. This creates a security risk.
ModifyPDF is different. We use advanced browser technology to process your files directly on your device. Your PDF never leaves your computer or phone. It is technically impossible for us (or anyone else) to see your documents.
Because we don't upload or download large files to a server, the processing happens instantly. You save time and bandwidth.
Need to watermark a contract on your iPhone or Android? Our tool is fully responsive and optimized for mobile touchscreens.
Yes! You can watermark as many files as you like. There are no hidden costs, no watermarks of our brand, and no limits.
Absolutely. You can choose any color from the color picker to match your brand or document style.
Yes. Unlike other sites, we do not store your files. The actual watermarking process happens inside your own web browser.
Ready to protect your documents?