Allow the Upload of Large Files with ASP.NET

When working with ASP.NET you may need to increase the default limit for file uploads. By editing the Web.config file you can allow larger payloads.

Example configuration:

<configuration>
  <system.web>
    <httpRuntime
      executionTimeout="240"
      maxRequestLength="16384"
      useFullyQualifiedRedirectUrl="false"
      minFreeThreads="8"
      minLocalRequestFreeThreads="4"
      appRequestQueueLimit="100"
      enableVersionHeader="true" />
  </system.web>
</configuration>

This configuration allows the upload of files up to 16 MB.

Note (2025): The default settings and limits may have changed in more recent versions of ASP.NET/.NET. Check the Microsoft documentation for updated guidance.