Extract text from MU Online images (OZB)
To convert OZB images to another format, you need MU Online or other Game software.
To convert other file formats to the "Game Texture File" file type, you need software like MU Online or a similar tool.
The .OZB file is a proprietary game asset format utilized by MU Online, a classic 3D MMORPG developed by Webzen. These files are used by the game client to store 2D graphic textures that are mapped onto 3D character models, monsters, environments, and user interface elements during gameplay.
Technically, .OZB files are not a completely original image format. Instead, Webzen obfuscated standard Microsoft Bitmap (.BMP) files by altering the file header. This basic encryption prevents standard image viewers from loading the textures, deterring casual players from extracting or stealing game assets. Community developers have since reverse-engineered this structure, creating CLI utilities like MuTexConv and MU Online Image Converter to unpack them.
The main disadvantage of the .OZB format is severe vendor lock-in. You cannot open these files in Adobe Photoshop, Windows Photo Viewer, or web browsers without first removing the obfuscation. Furthermore, because they are essentially uncompressed bitmaps, they are highly inefficient for file sharing or web deployment compared to modern web formats.
Modders and private server developers usually need to convert .OZB to BMP to edit the raw, uncompressed pixel data without losing quality. For general sharing, archiving, or web use, converting the extracted data to PNG or JPG is highly recommended to drastically reduce file sizes.
Standard online converters will fail to process an .OZB file because they see the altered header and immediately classify it as corrupted. Our analyzer bypasses the obfuscated game header, locates the embedded bitmap data, and allows you to extract it into widely supported image formats.
Convert.Guru analyzes your OZB file, detects the exact format, and lets you read the text inside.
If you want to convert OZB file to , you can use MU Online or similar software from the "Game Texture Storage" category. In the File menu, look for Save As… or Export….
To convert files to OZB, try MU Online or another comparable tool in the "Game Texture Storage" category.
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 OZB converter.