💧 PDF WatermarkPDF
About PDF Watermark
Protect your intellectual property and clearly mark your documents with the PDF Watermark tool, a fast, secure, and 100% private browser-based utility. Whether you need to label a document as "CONFIDENTIAL," "DRAFT," or "SAMPLE," this tool allows you to stamp custom text diagonally across every page of your PDF with professional precision. Unlike online services that require you to upload sensitive files to remote servers, this tool processes everything locally on your device. Powered by the robust pdf-lib library, your documents never leave your browser, guaranteeing absolute privacy, zero upload wait times, and complete data security. The interface is beautifully intuitive and highly customizable. Type your desired watermark text and instantly see a live preview of how it will look. You have full control over the aesthetic: adjust the font size, tweak the opacity to make it subtle or bold, set the rotation angle for the perfect diagonal slant, and choose from a palette of professional colors (Gray, Red, Blue, or Black). Supporting files up to 100 MB, this tool is completely free, adds no intrusive branding, and works seamlessly across all modern desktop and mobile browsers. Fast, secure, and effortlessly simple, it is the ultimate digital solution for safeguarding your documents.
How to use PDF Watermark
- Drag and drop your PDF file into the upload zone, or click to browse and select a file (maximum 100 MB).
- Once loaded, type your desired text into the "Watermark Text" field (e.g., "CONFIDENTIAL", "DRAFT", "SAMPLE").
- Use the Font Size slider to make the text larger or smaller to fit your page layout.
- Adjust the Opacity slider to make the watermark subtle and transparent, or fully solid.
- Set the Rotation angle (0 to 90 degrees) to achieve the perfect diagonal slant across the page.
- Select your preferred text Color from the dropdown menu (Gray, Red, Blue, or Black).
- Observe the Live Preview box at the top to ensure the watermark looks exactly how you want it.
- Click the "💧 Add Watermark & Download" button to instantly process the document.
- The newly watermarked PDF will automatically download to your device.
Frequently asked questions
Is this PDF watermark tool free and private?
Yes, it is 100% free and completely private. All processing happens locally in your browser, meaning your documents are never uploaded, tracked, or stored on any external server.
What is the maximum file size I can watermark?
The tool supports PDF files up to 100 MB, which is sufficient for most standard documents, reports, and presentations.
Can I remove the watermark later?
No. The watermark is drawn as permanent text directly onto each page of the PDF. It becomes a permanent part of the document's content, which is exactly what you want for security and authenticity.
Does the watermark appear on every page?
Yes, the tool automatically applies your customized watermark to the center of every single page in the uploaded PDF document.
Can I use this tool on my mobile phone or tablet?
Yes, the interface is fully responsive and touch-friendly, allowing you to easily upload, customize, and download watermarked PDFs directly from smartphones and tablets.
What happens if my PDF is password-protected?
The tool may not be able to read or modify heavily encrypted or password-protected PDFs. If you receive an error, please unlock the PDF using its password in a standard PDF viewer first, save an unencrypted copy, and then upload that version.
Do I need to install any software or extensions?
No, this is a web-based tool. It runs entirely in your browser, requiring no downloads, installations, or plugins.
Can I use an image or logo as a watermark?
This streamlined version is optimized for fast, text-based watermarking. If you need to add an image logo, you would need to use a dedicated PDF editor or design software.