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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.

Your Privacy is Protected

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.

Add Watermark to PDF – Free Online PDF Watermark Tool

Got Questions? We have you covered

Upload your PDF, type your watermark text, choose the position, color, font size, and opacity, then click 'Add Watermark'. Download the watermarked PDF instantly.

Yes, completely free with no registration, no watermark on the tool itself, and no file size limits.

Yes. Choose 'Diagonal' from the position options to stamp the watermark at an angle across each page.

Yes. Use the Opacity slider to set the watermark from almost invisible (low opacity) to fully opaque.

No. All processing happens entirely in your browser. Your PDF never leaves your device, keeping your content completely private.

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