Convert HTML to PDF.
Online, in .NET or by API.

using SelectPdf.Universal; // classic Windows library: using SelectPdf;

var converter = new HtmlToPdf();
converter.Options.PdfPageSize = PdfPageSize.A4;
converter.Options.MarginLeft = 20;

PdfDocument doc = converter.ConvertUrl(
    "https://yourapp.com/invoice/4821"
);

doc.Save("invoice-4821.pdf");
doc.Close();

curl -X POST https://selectpdf.com/api2/convert/ \
  -d "key=$SELECTPDF_KEY" \
  -d "url=https://yourapp.com/invoice/4821" \
  -d "page_size=A4" \
  --output invoice-4821.pdf

const selectpdf = require("selectpdf");

const client = new selectpdf.HtmlToPdfClient(
  process.env.SELECTPDF_KEY
);
client.setPageSize("A4");

client.convertUrlToFile(
  "https://yourapp.com/invoice/4821",
  "invoice-4821.pdf",
  function (err, fileName) {
    if (err) return console.error(err);
    console.log("Saved", fileName);
  }
);

import selectpdf

client = selectpdf.HtmlToPdfClient("YOUR_API_KEY")
client.setPageSize(selectpdf.PageSize.A4)

client.convertUrlToFile(
    "https://yourapp.com/invoice/4821",
    "invoice-4821.pdf",
)

print("Pages:", client.getNumberOfPages())

<?php
require("SelectPdf.Api.php");

$client = new SelectPdf\Api\HtmlToPdfClient("YOUR_API_KEY");
$client->setPageSize(SelectPdf\Api\PageSize::A4);

$client->convertUrlToFile(
    "https://yourapp.com/invoice/4821",
    "invoice-4821.pdf"
);

require "selectpdf"

client = SelectPdf::HtmlToPdfClient.new("YOUR_API_KEY")
client.page_size = SelectPdf::PageSize::A4

client.convert_url_to_file(
  "https://yourapp.com/invoice/4821",
  "invoice-4821.pdf"
)