Add Watermark to PDF Online Free
Stamp a custom text watermark on every page of your PDF. Processed entirely in your browser — your file is never uploaded to any server.
1 Upload PDF
PDF only · Max size: 50MB
2 Watermark Settings
3 Apply Watermark
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The watermark is embedded as text directly in the PDF — it will appear on every selected page when printed or viewed in any PDF reader.
How to Add a Watermark to PDF
1
Upload PDF — Select any PDF file from your device (up to 50MB).
2
Customize — Enter your watermark text and adjust position, size, opacity, and color.
3
Download — Click Apply Watermark and save your stamped PDF.
Frequently Asked Questions
Is my PDF uploaded to a server? +
No. Watermarking happens entirely in your browser using pdf-lib. Your file never leaves your device.
Can the watermark be removed? +
The watermark is embedded as a PDF content element. It can be removed by someone with advanced PDF editing tools, but it provides a clear visual mark for general use.
Can I apply it to only some pages? +
Yes. You can apply to all pages, odd pages only, even pages only, or just the first page.
Is this tool free? +
Yes, completely free with no signup required.