HTML to PDF in Python

POST the HTML to /v1/render with requests and write resp.content to a file. The render runs on the server, so requests is the only package you need:

import os

import requests

key = os.environ.get("PDFRENDER_KEY")  # optional
resp = requests.post(
    "https://api.pdfrender.dev/v1/render",
    json={"html": "<h1>Report</h1><p>Generated in Python.</p>", "filename": "report.pdf"},
    headers={"X-API-Key": key} if key else {},
    timeout=30,
)
if resp.status_code != 200:
    problem = resp.json()
    raise RuntimeError(f"{resp.status_code} {problem['code']}: {problem['detail']}")
with open("report.pdf", "wb") as f:
    f.write(resp.content)

Errors come back as application/problem+json. Branch on the code member (all codes). With httpx, the same call works in httpx.Client and httpx.AsyncClient.

Fill a template with Jinja2

Render your template to a string, then send that string as html:

from jinja2 import Template

html = Template(open("invoice.html").read()).render(number="2026-001", total="240.00 EUR")

Page size, headers and page numbers belong in the template's CSS (headers and footers).

Next step

Build an invoice template.

FAQ

How do I convert HTML to PDF in Python without wkhtmltopdf?

POST the HTML to /v1/render with requests or httpx and write the response bytes to a file. The render runs on the server, so there is no binary to install.

Is there a Python SDK?

No. The API is one JSON endpoint, so requests or httpx is the whole integration.