Add Text Watermarks to Your PDFs - Securely & Online

Protect your documents or add status markings like "CONFIDENTIAL" or "DRAFT". Our free online tool lets you easily apply custom text watermarks to your PDF documents. You have full control over font, size, color, opacity, position, and rotation, with a live preview to see your changes. All processing is done securely in your browser.
Secure & Private: This operation is processed entirely in your browser. Your files are not uploaded.

Your Free PDF Watermarking Tool

Upload PDF for Watermarking
Select a single PDF file to add a watermark.

Click to upload or drag and drop

Max file size: 10MB. Accepted: .PDF, PDF

How to Watermark a PDF in 3 Simple Steps

1. Upload PDF
Click the upload area or drag and drop your PDF file. The tool will quickly load your document, ready for watermarking.
2. Customize Watermark
Use the options panel to set the text, font size, color, opacity, position, and rotation angle. See your changes in the live preview.
3. Apply & Download
Click "Apply Watermark." Your new PDF is processed instantly in your browser and is ready for immediate download.

What To Do Next With Your Watermarked PDF?

Compress PDF
Reduce the file size of your watermarked document for easier sharing and storage.
Organize Pages
Need to make final adjustments? Reorder, rotate, or delete pages from your PDF.
Edit PDF
Add further annotations, text, or images to your document.

Frequently Asked Questions

Is it safe to watermark my PDF documents here?

Yes, it is completely secure. One23PDF processes your file directly in your browser. Your PDF is never uploaded to our servers, so your data remains 100% private.

Can I use an image as a watermark?

Currently, our tool supports text-based watermarks. This allows for extensive customization of font, size, color, and more. We are planning to add image watermark functionality in a future update.

What customization options are available?

You have full control over the watermark's appearance. You can set the text content, choose the position from a 9-point grid, adjust the font size, color, opacity, and rotation angle.

Can I see how the watermark will look before applying it?

Absolutely. The tool provides a live preview of how the watermark will appear on the first page of your PDF, so you can make adjustments and get the perfect result before finalizing.

Further Reading & Resources

The Security Risks of Using Online PDF Tools

Understand why browser-based PDF processing is critical for maintaining the privacy and security of your documents.

The Rise of Browser-Based PDF Editors: Security Meets Convenience

Explore the benefits of client-side PDF tools, which enhance security without sacrificing user-friendliness.