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# Adding JavaScript to a PDF
PDF readers vary in the extent they support JavaScript, with some not supporting it at all.
Adobe has documentation on its support here:
[https://opensource.adobe.com/dc-acrobat-sdk-docs/library/jsapiref/index.html](https://opensource.adobe.com/dc-acrobat-sdk-docs/library/jsapiref/index.html)
## Launch print window on opening
```python
from pypdf import PdfWriter
writer = PdfWriter(clone_from="example.pdf")
# Add JavaScript to launch the print window on opening this PDF.
writer.add_js("this.print({bUI:true,bSilent:false,bShrinkToFit:true});")
# Write to pypdf-output.pdf.
with open("pypdf-output.pdf", "wb") as fp:
writer.write(fp)
```
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