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How to use the CloudConvert API in C#

Online file converter for audio, video, document, ebook, archive, image, spreadsheet, presentation. This guide calls it from C# with code we've run against the live endpoint.

Online · 401 msEndpoint tested Oct 24, 2026

1. What you need

.NET 6 or newer. Paste into a top-level `Program.cs` and run `dotnet run`.

An API key from the provider (apiKey authentication). Endpoint: https://cloudconvert.com/api/v2

2. Make the request

C#
using System.Net.Http;

using var http = new HttpClient { Timeout = TimeSpan.FromSeconds(10) };
var json = await http.GetStringAsync("https://cloudconvert.com/api/v2");
Console.WriteLine(json);

3. The response

Trimmed from the live response on Oct 24, 2026.

JSON
{
  "redirect": "/docs"
}

4. Before you ship

  • Set a timeout and handle non-200 responses: free APIs can rate-limit or go down.
  • Cache responses where you can, instead of calling the API on every page view.
  • Keep the API key in an environment variable, never in source control.
  • Read the official documentation ↗ for rate limits and terms of use.

FAQ

Does the CloudConvert API need an API key in C#?

Yes. It uses apiKey authentication: read the key from an environment variable and send it with each request.

Can I call the CloudConvert API from the browser?

Not reliably: it doesn't send CORS headers. Call it from a server, serverless function or script.

What does the CloudConvert API return?

JSON. The example response on this page is trimmed from a real response our health check received on Oct 24, 2026.

Same API in: Python · Node.js · PHP · Java · Go · Ruby
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