# Add an image watermark to a PDF

Stamp an image across the pages of a PDF, in a Zap. Connect the PDF Blocks app once: no code, and no document is stored after the Zap runs.

Use this action to add an image watermark to a PDF document. You can
customize the watermark's transparency and margin.

## Input

<ParamField name="PDF Document" type="file" required>
  The content of the input PDF document.
</ParamField>

<ParamField name="Transparency" type="integer number" default="50">
  The transparency of the watermark, from 0 to 100. A value of 0 is
  opaque and 100 is fully transparent.
</ParamField>

<ParamField name="Margin" type="number" default="1.0">
  The distance, in inches, from the page border to the watermark. Must be
  a positive number; decimals are allowed.
</ParamField>

## Output

<ParamField name="File" type="file">
  A file with the watermarked PDF document. You can use it as input to
  other steps in your zap.
</ParamField>