Abstract: A file format conversion system includes a web server, a service providing server and an electronic device. The web server provides a first URL associated with a first file. The electronic device sends a request of the first URL to the service providing server. The service providing server analyzes the first URL based on the request and generates a first list, which records file formats stored at the first URL. The electronic device separates the first list into a second list, which records file formats supported by the electronic device, and a third list, which records file formats not supported by the electronic device. After receiving the second and third list, the service providing server updates two databases inside. The service providing server converts the first file into a second file based on the second and third lists and generates a second URL associated with the second file.