Independent and Controllable OFD Format Conversion Platform is based on China's independent and controllable electronic fixed-layout document format (OFD) and is a platform for full-process parsing, conversion and display. The platform can parse PDF, Word, HTML and other foreign fixed-layout and flow-layout files, and convert the original text, images, geometric shapes, watermarks and other content as required by the national standard at a ratio of 1: 1. It outputs the content in the original layout to an independent and controllable reader, where users can read and operate on it. During this process, it can encrypt and verify the document content according to the archival “Four Properties “testing requirements. For foreign document formats with security risks, this platform provides, based on the OFD national standard, a reliable alternative that supports the security and confidentiality of fixed-layout documents in China.