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Add Watermark to PDF

Stamp your documents with custom text like "CONFIDENTIAL" or "DRAFT". Fast, secure, and 100% offline.

Upload PDF File

Click or drag & drop your document here.
Zero server uploads. Processed strictly on your device.

How to watermark a PDF document locally

Protect your intellectual property or label your document's status without relying on external servers. Otter Digitals uses advanced browser technologies to stamp your text directly onto every page of your PDF.

  • Otter Logo
    Click the "Upload PDF File" box to choose your document.
  • Type the text you want to use as a watermark (e.g., "CONFIDENTIAL", "DO NOT COPY").
  • Adjust the color, size, rotation, and opacity to make sure it doesn't block the document's main text.
  • Click Apply Watermark & Download to get your stamped file instantly!