Technologies are generally described for detecting transcoding and adjusting visual content for optimal display on user devices. A content provider may transmit a sample of a visual content to a user device over a service provider network, and may monitor the quality of the sample that the user device receives. The service provider may apply transcoding to the sample during the transmission causing the quality of the sample to be degraded. The content provider may receive a sample as rendered from the user device and may compare the sample as rendered to the visual content to identify a transcoding applied by the service provider network. The content provider may the transcoding to the visual content and may transmit visual content that is transcoded for optimal display over the service provider network to the user device.