Convert from Base64 – Aspose.HTML Cloud

This article demonstrates how to convert Base64-encoded HTML content into various formats using Aspose.HTML Cloud API. While this example demonstrates converting HTML Base64 to PDF, the same API supports conversion to multiple other formats by simply changing the URL path:

HTML Converter: PDF, XPS, DOCX, JPEG, PNG, TIFF, BMP, GIF, Markdown, and MHTML.
SVG Converter: PDF, XPS, JPEG, PNG, TIFF, BMP, and GIF.

Before starting, ensure you have an authorization token. Refer to the Authorization Guide for details.

Base64 Conversion Methods

Aspose.HTML Cloud supports synchronous conversion for Base64-encoded content:

Synchronous Conversion: Suitable for immediate conversion where the result is returned directly.

Synchronous Base64 HTML to PDF Conversion

Endpoint: POST https://api.aspose.cloud/v4.0/html/conversion/html-pdf/sync

Authorization: Bearer token

Request Body:

1{
2    "InputBase64": "PGh0bWw+PGJvZHk+PGgxPkhlbGxvIFdvcmxkPC9oMT48L2JvZHk+PC9odG1sPg=="
3}

Response: Converted PDF file as a binary stream.

 1using System;
 2using System.IO;
 3using System.Net.Http;
 4using System.Net.Http.Headers;
 5using System.Text;
 6using System.Threading.Tasks;
 7using Newtonsoft.Json;
 8
 9public class ConversionRequest
10{
11    public string InputBase64 { get; set; }
12}
13
14public async Task ConvertHtmlBase64ToPdf()
15{
16    string apiUrl = "https://api.aspose.cloud/v4.0/html/conversion/html-pdf/sync";
17    string outputFilePath = @"C:\\temp\\output_from_base64.pdf";
18
19    string htmlBase64 = Convert.ToBase64String(Encoding.UTF8.GetBytes("<html><body><h1>Hello World</h1></body></html>"));
20
21    using var client = new HttpClient();
22    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "YOUR_ACCESS_TOKEN");
23
24    var requestBody = new ConversionRequest { InputBase64 = htmlBase64 };
25    string jsonRequest = JsonConvert.SerializeObject(requestBody);
26    HttpContent content = new StringContent(jsonRequest, Encoding.UTF8, "application/json");
27
28    var response = await client.PostAsync(apiUrl, content);
29
30    if (!response.IsSuccessStatusCode)
31    {
32        var error = await response.Content.ReadAsStringAsync();
33        throw new Exception($"Conversion failed: {response.StatusCode} - {error}");
34    }
35
36    var pdfBytes = await response.Content.ReadAsByteArrayAsync();
37    await File.WriteAllBytesAsync(outputFilePath, pdfBytes);
38
39    Console.WriteLine($"PDF saved to {outputFilePath}");
40}

JavaScript

 1async function convertHtmlBase64ToPdf() {
 2    const url = "https://api.aspose.cloud/v4.0/html/conversion/html-pdf/sync";
 3
 4    const htmlContent = "<html><body><h1>Hello World</h1></body></html>";
 5    const htmlBase64 = btoa(htmlContent);
 6
 7    const requestBody = JSON.stringify({ "InputBase64": htmlBase64 });
 8
 9    const response = await fetch(url, {
10        method: 'POST',
11        headers: {
12            'Authorization': 'Bearer YOUR_ACCESS_TOKEN',
13            'Content-Type': 'application/json'
14        },
15        body: requestBody
16    });
17
18    if (!response.ok) {
19        const errorText = await response.text();
20        throw new Error(`Conversion failed: ${response.status} - ${errorText}`);
21    }
22
23    const blob = await response.blob();
24    const downloadLink = document.createElement('a');
25    downloadLink.href = URL.createObjectURL(blob);
26    downloadLink.download = 'output.pdf';
27    downloadLink.click();
28
29    console.log("PDF downloaded successfully.");
30}

Convert from Base64 – Aspose.HTML Cloud

Base64 Conversion Methods

Synchronous Base64 HTML to PDF Conversion

See Also