Fill PDFs with Python

Fill existing PDF templates with Python. Set up a PDF template, send data to Anvil, and get back a completed PDF — no manual entry required.

Open in Github Python SDK

Python Example
PDF_TEMPLATE_EID = "f9eQzbUgCCRVDrd4gt8b"
FILL_DATA = {
  "title": "My PDF Title",
  "fontSize": 10,
  "textColor": "#CC0000",
  "data": {
    "someFieldId": "Hello World!"
  }
}

def main():
  anvil = Anvil(api_key=API_KEY)

  print("Making fill request...")

  with open(FILE_OUTPUT, "wb") as f:
      f.write(res)

Get Started

Installation

The python-anvil package is MIT-licensed and maintained in the open on GitHub.

$ pip install python-anvil

Set-up with Claude

Let Claude build your integration

Install the Anvil Document SDK plugin in Claude Code and Claude will scaffold the SDK into your codebase — discovery, planning, and production-ready code.

/plugin marketplace add anvilco/anvil-plugins
/plugin install anvil-document-sdk@anvil-plugins

No API key setup needed. The plugin connects to your Anvil account with OAuth and logs you in automatically.

Demo

Instantly fill your PDF templates with JSON data. Try an example below and see documentation when ready to fill your own.

Why Anvil

We're fast

Fill PDF templates with JSON data in a single API call – whether it's one document or a million.

Flexibility

Turn any PDF into an API-fillable template with Anvil Document AI, or build dynamic templates with the Document Editor. Update templates anytime without changing your code.

Easy-to-use

Templates are set up visually with no-code tools, so anyone on your team can pitch in. POST your JSON data, get back a completed PDF.

Compliant

SOC 2 Type 2 certified, HIPAA-eligible with a BAA, and GDPR-ready. That's how companies like Carta, Ganaz, and Seso automate their paperwork.

Get a demo
(from a real person)

Schedule some time on our calendar to talk through your specific use case and see which Anvil products can help.

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