Add Watermark to PDF
Add text or image watermarks to your PDF files with a live preview. Adjust text, font, size, angle, opacity, color, and position in real-time. See exactly how your watermark looks before applying to all pages. All processing happens locally in your browser.
Watermark Applied
What Is a PDF Watermark?
A PDF watermark is a semi-transparent text or image overlay placed on document pages to indicate ownership, confidentiality, or draft status. Watermarks serve as a visual deterrent against unauthorized distribution and help recipients understand how a document should be handled. Whether you need to mark legal contracts as "CONFIDENTIAL," label internal reports as "DRAFT," or brand marketing materials with your company name, watermarking is an essential document management practice.
This free online tool lets you add text watermarks to any PDF file directly in your browser. No uploads to external servers, no account required, and no file size limits beyond your device's memory. Your documents remain completely private throughout the entire process.
How to Add a Watermark to PDF
- Upload your PDF by dragging it onto the drop zone or clicking to browse. Files up to 100 MB are supported.
- Configure your watermark using the controls on the left. Set the text, font, size, rotation angle, opacity, and color. Choose between centered, tiled, top, or bottom positioning.
- Preview in real-time as you adjust settings. Navigate between pages to see how the watermark appears on different layouts.
- Apply to all pages by clicking the Apply button or pressing Enter. A progress bar shows the status for each page.
- Review the result in the built-in viewer showing the first five pages with your watermark applied.
- Download your watermarked PDF with a custom filename, or press Ctrl+D to download instantly.
Features
- Live preview that updates instantly as you change settings
- Four positioning modes: center, tiled, top, and bottom
- Four font choices: Helvetica Bold, Helvetica, Times Roman, Courier Bold
- Full color picker with any hex color value
- Adjustable font size (10px to 150px), rotation (-90 to 90 degrees), and opacity
- Editable output filename before downloading
- Processing statistics: page count, original size, output size, and time taken
- Cancel button to stop processing mid-way
- Keyboard shortcuts: Enter to apply, Ctrl+D to download
- 100 MB file size validation with clear error messages
- Drag-and-drop with visual feedback animation
- Mobile responsive layout that adapts to any screen size
Use Cases
Legal and compliance: Law firms watermark draft contracts and sensitive documents with "CONFIDENTIAL" or "ATTORNEY-CLIENT PRIVILEGED" to clearly communicate handling requirements. This creates a visual record that recipients were informed of the document's classification.
Academic and publishing: Authors and researchers mark pre-publication manuscripts with "DRAFT" or "REVIEW COPY" to prevent premature distribution. Publishers use watermarks on advance reader copies to trace leaks back to specific recipients.
Business operations: Companies watermark internal reports, financial statements, and strategic plans before sharing with external partners. A tiled watermark with the company name makes unauthorized redistribution immediately obvious.
Tips for Effective Watermarks
- Keep opacity between 10-20% for text documents so the watermark is visible without obscuring content
- Use tiled mode for maximum coverage since a single centered watermark can be cropped out easily
- Rotate at -35 to -45 degrees for diagonal watermarks that cross the most content area
- Choose gray for professional documents as colored watermarks can look unprofessional on formal papers
- Test on multiple pages using the page selector since layouts vary and your watermark should work on all of them
Types of PDF Watermarks
Text watermarks are the most common type, using words like "CONFIDENTIAL," "DRAFT," "SAMPLE," or a company name. They are lightweight, do not significantly increase file size, and work well at any document scale. This tool specializes in text watermarks with full customization.
Image watermarks use logos or stamps overlaid on pages. They are ideal for branding but increase file size proportionally to the image resolution. For adding image-based watermarks, consider using a tool like Add Watermark to Image on individual pages exported as images.
Dynamic watermarks include variable information like the recipient's name, date, or a tracking ID. These require server-side processing and are typically used in enterprise document management systems rather than browser-based tools.
Frequently Asked Questions
Is my PDF uploaded to any server?
No. All processing happens entirely in your browser using JavaScript. Your file never leaves your device. We use pdf-lib for watermark application and PDF.js for rendering previews, both running locally.
Can I remove a watermark after applying it?
Watermarks applied with this tool are embedded directly into the PDF page content. They cannot be easily removed without specialized software. If you need to remove watermarks from a PDF, try our Remove Watermark tool.
Does watermarking increase the file size?
Text watermarks add minimal size, typically less than 1 KB per page. The output file will be very close to the original size. You can verify this in the processing statistics shown after applying.
Can I watermark a password-protected PDF?
You need to remove the password protection first. Use our Unlock PDF tool to remove the password, then apply your watermark, and optionally re-protect the PDF afterward.
What is the maximum file size supported?
The tool accepts files up to 100 MB. Processing time depends on the number of pages and your device's performance. A 50-page document typically processes in under 3 seconds on modern hardware.
Related Tools
Adding watermarks to your PDFs is a simple but effective way to protect your documents and communicate their intended use. Whether you are marking drafts for internal review or branding client deliverables, this tool gives you full control over appearance and positioning with zero privacy concerns. Try adjusting the tiled mode with low opacity for maximum coverage that does not distract from the content.