PDF Watermark Tool – Add Text or Logo Watermarks to PDF

Protect your documents, assert ownership, or add “DRAFT” or “CONFIDENTIAL” stamps with our free PDF watermark tool. Add text watermarks (custom text, color, size) or image watermarks (your logo) to every page of a PDF. Fully customizable opacity, rotation, and position – all processed locally, no upload required.

🛡️ Why Watermark Your PDF Documents?

Watermarking is the practice of overlaying a semi‑transparent text or image onto a document. It’s a powerful way to:

• Protect intellectual property: Discourage unauthorized copying or distribution.
• Mark document status: Add “DRAFT”, “CONFIDENTIAL”, “FOR REVIEW”, or “SAMPLE”.
• Brand your files: Place your company logo on every page of a proposal or report.
• Assert ownership: Include your name or website on shared files.

1. Protect Sensitive Information & Intellectual Property

If you share PDFs externally – for example, a business plan, financial forecast, or legal contract – adding a “CONFIDENTIAL” watermark makes it clear that the document is not for redistribution. Even if the file is forwarded, the watermark remains visible. Our tool “flattens” the watermark into the PDF content, making it difficult to remove without professional software.

2. Mark Drafts and Work in Progress

When collaborating on a document, it’s essential to distinguish between draft versions and final versions. Adding a “DRAFT – DO NOT DISTRIBUTE” watermark on each page prevents accidental sharing of unfinished content. You can change the watermark text for each iteration (e.g., “v1.0 DRAFT”) and remove it only when final.

3. Brand Your Documents with Logos

Companies, consultants, and freelancers often want to place their logo on every page of a client deliverable – a report, a quote, or an invoice. Our tool lets you upload your logo (PNG or JPG), adjust its size and opacity, and stamp it across all pages. This builds brand recognition and adds a professional touch.

🔒 100% Private – No Server, No Upload

Many online watermark tools ask you to upload your PDF to a remote server, exposing your proprietary content to data breaches. Free PDF Tools uses pdf-lib and PDF.js to render the preview and generate the watermarked PDF entirely in your browser. Your file never leaves your device. No upload, no server logs, no tracking – your documents stay confidential.

⚙️ How the Watermarking Works Technically

We load your PDF using pdf-lib and PDF.js. PDF.js renders the first page for the live preview. The preview uses HTML Canvas to simulate the watermark (text or image) with your chosen settings. When you click “Apply”, we create a new PDF document using pdf-lib. For each page, we draw the watermark as a text string (with embedded font) or an embedded image (PNG/JPG), applying rotation, opacity, and position. The result is a new PDF with the watermark added to every page. Because we draw the watermark as a page‑content object, it becomes part of the file and is visible in any PDF reader.

❓ Frequently Asked Questions – PDF Watermarking

Q: Can the watermark be removed after I add it?
A: Our tool draws the watermark as part of the page content (it’s “flattened”). Removing it requires sophisticated PDF editing software (like Adobe Acrobat Pro) and is non‑trivial for casual users. For everyday protection, this is sufficient.

Q: What’s the best opacity setting for a watermark?
A: For most documents, an opacity between 0.2 and 0.4 works well – the watermark is visible but doesn’t obscure the underlying text. For a very subtle mark, use 0.1; for a bold stamp, use 0.6 or higher.

Q: Can I use a transparent PNG logo?
A: Yes. PNG images with transparency are supported, and the transparency will be preserved (though the overall opacity slider still applies).

Q: Does this tool work on scanned (image‑based) PDFs?
A: Yes. The watermark is added as a new layer on top of the existing page content. It works equally well on digital text PDFs and scanned image PDFs.

Q: Is there a limit on file size or number of pages?
A: No artificial limit – but very large PDFs (hundreds of pages) may take slightly longer to process, as the tool iterates through every page locally. The time depends on your device’s CPU.

Q: Does the tool work on mobile phones?
A: Yes. It works on modern browsers (iOS Safari, Android Chrome). The preview canvas scales appropriately, and the controls are touch‑friendly.

Q: Is the tool really free and unlimited?
A: Absolutely. Free PDF Tools is completely free. Watermark as many PDFs as you need – no registration, no watermarks on the output, no hidden fees.

Keywords: PDF watermark, add watermark to PDF, text watermark, logo watermark, free PDF tool, no upload PDF editor, protect PDF documents.