Add Watermark to PDF
Add custom text watermarks to your PDF files instantly. Adjust position, color, opacity, and font size. Free, private, no signup required.
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All processing happens directly in your browser. Your PDF is never uploaded to any server.
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Add a Text Watermark to Any PDF for Free
Our PDF Watermark Tool lets you stamp any text — such as 'CONFIDENTIAL', 'DRAFT', your company name, or a copyright notice — onto every page of a PDF document. Customize font size, color, opacity, and position to match your branding or compliance requirements. Everything runs in your browser with no installation and no account needed.
Why Add a Watermark to Your PDF?
Watermarks serve several important purposes: they protect intellectual property by identifying the document owner, they signal document status such as DRAFT or CONFIDENTIAL to readers, and they deter unauthorized copying or redistribution. Whether you are a business protecting reports, a designer sharing mockups, or an educator distributing materials, watermarking your PDFs adds a professional layer of protection.
How the PDF Watermark Tool Works
The tool loads your PDF using PDF.js, renders each page to a canvas, overlays your watermark text at the chosen position with the selected font size, color, and opacity, then compiles the stamped pages back into a downloadable PDF using jsPDF. All processing happens client-side — your file never leaves your device, ensuring complete privacy.
PDF Watermark Tool vs. Desktop Alternatives
Adding watermarks in Adobe Acrobat requires a paid subscription. Our free online tool delivers the same essential functionality — text overlay with full position and style control — without any cost, download, or sign-up. It works on Windows, Mac, Linux, iPhone, and Android, making it the most accessible way to watermark a PDF.
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