IronPDF Alternative
PDFBolt HTML to PDF API

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Invoice #1042</h1><p>Amount: $250.00</p>");

// Export to a file or Stream
pdf.SaveAs("invoice.pdf");

using System;
using System.Net.Http;
using System.IO;
using System.Threading.Tasks;
using System.Text.Json;

using var client = new HttpClient();

string html = "<h1>Invoice #1042</h1><p>Amount: $250.00</p>";
string base64Html = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(html));

var requestData = new { html = base64Html };

var request = new HttpRequestMessage {
    Method = HttpMethod.Post,
    RequestUri = new Uri("https://api.pdfbolt.com/v1/direct"),
    Content = new StringContent(
        JsonSerializer.Serialize(requestData),
        System.Text.Encoding.UTF8,
        "application/json"
    )
};

request.Headers.Add("API-KEY", "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX");

using var response = await client.SendAsync(request);
var pdfBytes = await response.Content.ReadAsByteArrayAsync();
await File.WriteAllBytesAsync("invoice.pdf", pdfBytes);