PDF Watermark
Add text or image watermark to all pages of a PDF using PDF-lib
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About PDF Watermark
Protect Your PDF Documents with Custom Watermarks
Sharing PDF documents is a daily occurrence in business, education, and creative industries. But every time a PDF leaves your hands, you lose a degree of control over it. The PDF Watermark Tool helps you maintain ownership visibility by stamping custom text or image watermarks onto your PDF pages - deterring unauthorised redistribution and clearly marking documents as confidential, draft, or proprietary.
Text Watermarks vs Image Watermarks
This tool supports both approaches, and each serves different purposes:
Text watermarks are the most common choice for business documents. Stamping the word CONFIDENTIAL, DRAFT, SAMPLE, or DO NOT DISTRIBUTE across each page sends an unmistakable signal about the document's intended use. You can customise the font size, colour, opacity, and rotation angle. A semi-transparent diagonal watermark is the classic approach - visible enough to discourage misuse but subtle enough that the actual content remains perfectly readable.
Image watermarks are preferred for branding purposes. Companies overlay their logo on PDF reports, proposals, and whitepapers to reinforce brand identity. Photographers and designers watermark PDF portfolios with their studio mark. Educational institutions add their crest to official transcripts and certificates.
Practical Scenarios for PDF Watermarking
The need for watermarks comes up more often than people expect. Here are real situations where this tool earns its keep:
Sending contracts for review. Before a contract is finalised, you share a draft with the other party. Watermarking it as DRAFT prevents anyone from accidentally (or intentionally) treating an unsigned version as the final agreement. Lawyers and procurement teams rely on this practice heavily.
Distributing sample content. Publishers sharing preview chapters, stock photo agencies sending comp images, and SaaS companies providing demo reports all use watermarks to differentiate free samples from paid content. The watermark makes it clear that the full, unmarked version requires a purchase or subscription.
Internal document control. Large organisations circulate sensitive internal memos, financial reports, and strategic plans. Watermarking each copy with the recipient's name creates accountability - if the document leaks, the watermark identifies who received that particular copy. This practice, sometimes called forensic watermarking, is standard in finance and government.
Academic submissions. Students submitting dissertations or research papers sometimes watermark their drafts to establish a timestamp of authorship before formal publication, providing a basic layer of intellectual property protection.
How to Add a Watermark to Your PDF
Upload your PDF file and choose between text or image watermark mode. For text, type your message and configure appearance settings including colour, size, transparency, and position. For images, upload a logo or graphic in PNG or JPEG format. Preview the watermarked result before committing, and adjust until the balance between visibility and readability feels right.
The tool processes multi-page documents efficiently, applying the watermark consistently across every page. You can also choose to watermark only specific page ranges if needed - for instance, watermarking only the first page of each section or skipping cover pages.
Client-Side Processing for Confidential Documents
Here is the critical detail that sets this tool apart from most online PDF watermarkers: your file never leaves your device. The entire watermarking process runs in your web browser using local PDF processing libraries. No upload to remote servers, no temporary copies stored in the cloud, no privacy risk. This is especially important when watermarking the very documents that you are trying to protect as confidential in the first place.
The output PDF maintains the quality of the original. Text remains selectable, links stay clickable, and embedded fonts are preserved. The watermark is added as an overlay layer, meaning the underlying content is untouched. Download your watermarked PDF and share it with confidence.