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Guide on using the Python pypdf library to read, write, and fill PDF forms programmatically.
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| name | python-pypdf |
| description | Guide on using the Python pypdf library to read, write, and fill PDF forms programmatically. |
The pypdf library allows you to manipulate PDF files in Python. This skill focuses on reading PDF form fields and filling them out programmatically.
pip install pypdf
You can read all form fields from a PDF to understand their names and types:
from pypdf import PdfReader
reader = PdfReader("form.pdf")
fields = reader.get_fields()
for field_name, field_data in fields.items():
print(f"Field: {field_name}, Type: {field_data.get('/FT')}, Value: {field_data.get('/V')}")
You can create a writer object, append the pages from the reader, and then use the update_page_form_field_values method to fill fields:
from pypdf import PdfReader, PdfWriter
reader = PdfReader("form.pdf")
writer = PdfWriter()
writer.append_pages_from_reader(reader)
# Define a dictionary mapping field names to values.
data = {
"FieldName1": "Value1",
"Checkbox1": "/Yes" # Checkboxes usually expect "/Yes" or "/Off"
}
writer.update_page_form_field_values(writer.pages[0], data)
with open("filled.pdf", "wb") as f:
writer.write(f)