Hancom ThinkFree Online is a thinkfree application from Hancom that allows users to synchronize document and image files from their iPhone (iOS) and ThinkFree Online. ThinkFree Online has a self-hosted web office server (ThinkFree Server Integrator) that allows users to add web office functionality into their existing web applications or portals. It also offers free online storage that allows iPhone users to view and save a variety of documents, or share with colleagues using email or SMS. This application supports file formats in MS office (Word, Excel, and PowerPoint), RTF, HTML, TXT, PDF, BMP, GIF, PNG, and JPG. Users should sign-up with an email address to have a ThinkFree account that provides a free web office suite with 1 GB of online storage. This applicatyion is designed for iPhone 3GS and iPhone 4 (for iPod Touch 4G sending files via SMS are not available), and optimized for iOS 4.2.1.