The default max single file upload size is 50 MB by default for a web application (in IIS 6.0)and the default max single file upload size is 28 MB by default for a web application (in IIS 7.0).
In order to increase the maximum file upload size , please make the following change in central Administration
- Go to SharePoint Central Administration > Application Management'.
- Under SharePoint Web Application Management, click 'Web application general settings’.
- On the Web Application General Settings page, choose the appropriate web application.
- Under Maximum upload size, type the file size which you want to upload and click on OK. You can specify a maximum file size up to 2,047 megabytes.
Another important changes is to modify web.config file.This change will add timeout to the runtime tag.
- Open the web.config
- Replace the below tag <httpRuntime maxRequestLength="51200" />
- <httpRuntime executionTimeout="999999" maxRequestLength="51200" />