Images bigger than 10MB cannot be saved if the ImageEditor is used in enabled CanvasMode, even though the MaxJsonLenght property is configured. The ImageSaving event handler is also never called. The only possible workaround for the moment is using the ImageEditor in disabled CanvasMode (CanvasMode="No")
The issue is fixed by applying the following configuration in web.config: - to the ImageEditor: <telerik:RadImageEditor ID="RadImageEditor1" CanvasMode="Yes" runat="server"ImageUrl="~/Images/4MB.jpg"> <EditableImageSettings MaxJsonLength="2147483640" /> </telerik:RadImageEditor> - to the application: <configuration> <system.web> <httpRuntime maxRequestLength="2147483640"/> </system.web> <system.web.extensions> <scripting> <webServices> <jsonSerialization maxJsonLength="2147483640"/> </webServices> </scripting> </system.web.extensions> </configuration>