Website Screenshots in C# — ASP.NET Core Ready
Capture any website screenshot from C# using HttpClient with async/await. Works with ASP.NET Core, Azure Functions, .NET Worker Services, and console apps.
// ASP.NET Core — using IHttpClientFactory (recommended)
public class ScreenshotService
{
private readonly HttpClient _client;
private readonly string _apiKey;
public ScreenshotService(IHttpClientFactory factory, IConfiguration config)
{
_client = factory.CreateClient();
_apiKey = config["GoScreenAPI:Key"]!;
}
public async Task<string> CaptureAsync(string url)
{
_client.DefaultRequestHeaders.Clear();
_client.DefaultRequestHeaders.Add("X-API-Key", _apiKey);
var payload = new
{
url,
full_page = true,
format = "png",
block_ads = true
};
var response = await _client.PostAsJsonAsync(
"https://goscreenapi.com/api/v1/screenshot", payload);
response.EnsureSuccessStatusCode();
var result = await response.Content
.ReadFromJsonAsync<Dictionary<string, object>>();
return result!["image_url"].ToString()!;
// => "https://cdn.goscreenapi.com/screenshots/abc123.png"
}
}
Everything you need.
Nothing you don't.
IHttpClientFactory
Use IHttpClientFactory in ASP.NET Core for proper connection pooling and lifecycle management.
Async/Await Native
PostAsJsonAsync and ReadFromJsonAsync — fully async, no blocking calls.
Azure Functions
Works in Azure Functions, Azure Container Apps, and any .NET serverless environment.
.NET Worker Services
Add screenshot capture to background .NET Worker Services with IHostedService.
Full-Page & PDF
full_page = true for scrollable pages, format = "pdf" for PDF output.
No Selenium
No WebDriver, no chromedriver, no browser automation setup in your .NET app.
Built for real workflows
From solo developers to enterprise teams — GoScreenAPI fits into any stack.
ASP.NET Core Web Apps
Add screenshot features to ASP.NET Core MVC or Razor Pages applications.
Azure Functions
Lightweight screenshot calls in Azure Functions — no Chrome binary in your deployment.
.NET Worker Services
Scheduled screenshot capture in background .NET Worker Services.
PDF Report Generation
Generate PDF reports from dashboard URLs without iTextSharp or PdfSharp.
| Parameter | Type | Description |
|---|---|---|
url |
string | Target URL to capture (required) |
full_page |
bool | Capture entire scrollable page |
format |
string | png | jpeg | webp | pdf |
selector |
string | CSS selector — capture one element |
block_ads |
bool | Remove ads and cookie banners |
device |
string | desktop | mobile | tablet |
async |
bool | Background processing with webhook |
webhook_url |
string | POST callback URL for async results |
Speed. Scale. Simplicity.
Sync mode results in under 3 seconds for most pages.
Production-grade reliability with redundant infrastructure.
Handle high-volume workloads without throttling.
Common questions
Start building with GoScreenAPI
250 free screenshots every month. No credit card required. Production-ready in minutes.
Fast Screenshot API Overview
The screenshot API offers a powerful means for developers to capture any URL as an image format like PNG, JPEG, or WebP via a REST interface. Remarkably, the response time is typically under three seconds. With this tool, you can specify custom viewport dimensions, full-page capture, retina 2x resolution, and even enable dark mode effortlessly.
Interested in trying it out? The API provides 250 free credits each month, perfect for testing and integration. With over 2000 developers relying on it, this free screenshot tool is rapidly becoming a developer favorite.
Features and Customization
Our screenshot API enables extensive customization options for your website screenshot needs. You can capture full pages or specific sections by setting your preferred viewport size. Additionally, our full page capture capability ensures you do not miss any vital content on the target page.
Besides capturing the standard view, you can opt for retina 2x resolution for higher clarity or transform the page display with dark mode. These features make the API versatile for capturing various display scenarios programmatically.
Efficient REST API Usage
Using the REST API screenshot capability, developers can convert any URL to an image with simple HTTP requests. The API is designed for ease of use, providing rapid responses in less than three seconds and supporting multiple image formats.
You can perform HTML to image conversion efficiently, thanks to our streamlined endpoint architecture. The HTML to image conversion page offers further insights into the API's functionality.
Getting Started with 250 Free Credits
New users can leverage 250 free credits each month to test and integrate the screenshot API into their workflows. This allocation empowers developers to explore different API features without initial costs, facilitating seamless incorporation into projects.
The simple setup process and comprehensive documentation make it easy to get started. Join the community of over 2000 developers who are already reaping the benefits of this programmatic screenshot solution.
FAQ
What image formats are supported?
The screenshot API supports PNG, JPEG, and WebP formats, allowing flexibility in choosing the best format for your use case.
How do I enable dark mode?
Dark mode can be activated by setting a specific parameter in your API request, allowing you to capture a website in an alternate color scheme.
What is the maximum capture resolution supported?
The API supports retina 2x resolution, ensuring high-quality images that are suitable for detailed analysis and presentations.
How quickly can I expect a response?
The API typically delivers responses in under three seconds, making it one of the fastest options available for capturing website screenshots via REST.
Ready to capture your first website screenshot? Start using the screenshot API today and transform the way you work with web images.