Issue
You’re trying to fill a PDF form created with XFA (XML Forms Architecture), but it’s not working with PDF.co’s API.
Why This Happens
PDF.co does not support XFA forms. XFA forms use a different structure than standard PDFs (AcroForms), and are not compatible with PDF.co’s form-filling or editing tools.
Solution
1. Convert the XFA form to a standard PDF:
Open the XFA form in Adobe Acrobat.
Use Print to PDF to create a flattened, standard PDF.
2. Use PDF.co on the converted PDF:
You can now use
/pdf/edit/addto add text, images, or fill fields.Works with Zapier, Make, or direct API calls.
Tips
Conversion is only needed once per form template.
Always fill the converted PDF, not the original XFA file.