Extract text from SII files
To convert your SII file to another format, you need Euro Truck Simulator 2 or other Game software.
To convert other file formats to the "Save File" file type, you need software like Euro Truck Simulator 2 or a similar tool.
The .sii file is a proprietary data format developed by SCS Software for use in the Prism3D engine, which powers popular simulation titles like Euro Truck Simulator 2 and American Truck Simulator. These files act as the backbone for game configuration, vehicle definitions, and most importantly, player save progression (commonly found as game.sii).
While .sii files are structurally similar to plain text, save files are frequently generated in an encrypted or binary-serialized state to optimize performance and prevent casual tampering. This presents a significant barrier for users wanting to mod their game - such as adjusting in-game currency or experience points - as opening the raw file in a text editor often displays unreadable gibberish. Additionally, the format is strict; a single syntax error can render a save file corrupt and unusable.
For modding and editing purposes, the most effective solution is converting the .sii file to Plain Text (.TXT). This usually requires a specific decryption step (often using community tools like the SII Decrypt utility) to transform the binary data into a human-readable structure. Once converted to text, values can be modified and saved; the game engine is generally capable of reading the unencrypted text version without needing re-encryption. For developers analyzing game data, converting to JSON is also beneficial to visualize the nested object hierarchy.
Convert.Guru analyzes your SII file, detects the exact format, and lets you read the text inside.
Users also converted TXT, SLL, SCS, SSI, SI, DDS, SUI, CFG, ZIP, PMG, PNG, OBJ and BANK files.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our SII converter.