Watermark PDF
Add text or image watermarks to PDF files online for free. Customize watermark position, color, opacity, rotation, and apply it to all pages or selected pages securely.
Drop your PDF file here
Max file size: 50 MB
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Secure
Your files are transferred and processed securely over encrypted HTTPS.
Fast
Add watermark to your PDF files in seconds with instant visual preview rendering.
Easy to Use
Simple and intuitive interface makes adding watermark easy and quick.
Watermark PDF Online
MarsPDF offers a fast and secure online tool to add text or image watermarks to your PDF documents. Whether you need to stamp "CONFIDENTIAL", add your corporate logo, or insert a copyright notice, our browser-based watermark tool allows you to completely customize the placement, size, rotation, opacity, and typography of your stamp. No software installation, registration, or payment is required.
Our tool features an interactive, real-time page preview, meaning you can visually track exactly how the watermark looks on each page before committing the final file. You can choose to apply the watermark across every single page or target a specific subset of page ranges.
How to Add Watermark to PDF
Upload PDF File
Drag and drop your PDF document into the upload area above, or click the select button to upload a file from your device.
Customize Watermark
Select text or image type. Adjust opacity, font style, size, color, rotation angle, and choose the stamp grid position.
Download Document
Click "Add Watermark" to render the stamp securely. Your processed document will be ready for instant download in seconds.
Add Text Watermark to PDF
Personalize your document by stamping custom text directly onto the page margins or background. Our watermark tool lets you write any custom word or string and adjust its visual presentation. Choose from standard clean serif and sans-serif fonts such as Helvetica, Times New Roman, or Courier to match the look of your document.
Additionally, you can pick any color using the visual color picker swatch, configure transparency levels to keep text legible underneath, and rotate the stamp at any angle (such as a diagonal 45-degree angle) for professional styling.
Add Image Watermark to PDF
Protect your branded documents by stamping a corporate logo, digital signature, or custom SVG/PNG graphic onto the pages. The tool supports standard image formats including PNG, JPG, and JPEG. With a transparent background PNG, your brand logo blends seamlessly onto the document canvas.
Control the image footprint by scaling the size overlay dynamically from a small corner stamp to a large, faded background seal. Opacity adjustments prevent the logo from obscuring critical text content.
Customize Position, Opacity, Rotation, and Page Range
Our tool is engineered to give you complete layout control:
- Positioning Grid: Click one of the 9 layout cells (top-left, top-center, top-right, center-left, center-center, center-right, bottom-left, bottom-center, bottom-right) to lock your watermark exactly where you need it.
- Rotation: Rotate your watermark in increments to add diagonal security stamps that cover the entire page height.
- Page Ranges: Apply the stamp to all pages or target specific page numbers (e.g., "1-5, 8, 10-12") to exclude cover pages, table of contents, or appendices.
Why Add a Watermark to PDF?
Watermarking serves as a powerful shield to verify ownership, establish branding, and prevent unauthorized duplication. Placing a distinct text stamp or company mark makes it clear to anyone viewing the file that the intellectual property belongs to you. It is commonly used for:
- Marking drafts, receipts, invoices, and sensitive financial reports to clarify document status.
- Labeling documents with security levels such as "RESTRICTED", "INTERNAL USE ONLY", or "DO NOT COPY".
- Stamping digital copyright locks on academic works, contracts, proposals, and portfolios.
Secure Online PDF Watermarking
At MarsPDF, document confidentiality is our highest priority. All file uploads, configuration, and conversion processes run over encrypted HTTPS connections. Once your watermarked PDF is generated, our systems safely discard the source files and the watermarked output. We never keep logs of your document contents or store backups.
Frequently Asked Questions
Is it free to add watermarks to my PDF files?
Yes, adding watermarks with MarsPDF is completely free. There are no registration forms, daily usage caps, or hidden costs. You get full access to all positioning and customization tools.
What image formats are supported for image watermarks?
We support standard formats including PNG, JPG, and JPEG. For logos and signatures, we highly recommend uploading a transparent PNG file to ensure the background blends smoothly with the page.
Will the watermark affect the quality or formatting of my original text?
No, our watermarking system overlays the text or image elements precisely on top of your existing page layout without altering, reflowing, or converting your original document text and graphics.
Are my uploaded documents safe and private?
Yes. All communication with our servers is protected using SSL/TLS encryption. We do not store, copy, or retain your documents on our servers.