Extract text from Hierarchical graphics models (HGR)
To convert HGR Models to another format, you need Angry Birds or other Game software.
To convert other file formats to the "3D Game Asset" file type, you need software like Angry Birds or a similar tool.
The .HGR file format is a Hierarchical Graphics Renderer Model, heavily used by Rovio Entertainment in popular mobile titles like the Angry Birds franchise. It stores compiled game assets, including hierarchical node data, 3D meshes, textures, and rigging information optimized for fast rendering on mobile devices.
Because this is a closed, proprietary format, users face significant challenges when trying to access or edit the content. Standard 3D modeling tools like Blender or Maya cannot open .HGR files natively. The format lacks public documentation, meaning modders and developers are often locked out of the visual data without using custom reverse-engineering tools or scripts to unpack the file archives.
To manipulate or reuse these assets, users typically need to convert them into industry-standard formats such as OBJ (for static meshes), FBX (for rigged models), or PNG (for extracted textures). However, converting a highly optimized, compiled asset often results in the loss of complex skeletal animations and proprietary material shaders.
This file format is exceptionally difficult to open or convert because often only the original game engine software can properly read or export the data. If our analysis detects a supported underlying or embedded format - like an embedded image texture - viewing or conversion may still be possible.
Convert.Guru analyzes your HGR file, detects the exact format, and lets you read the text inside.
If you want to convert HGR file to , you can use Angry Birds or similar software from the "Game Model Asset Storage" category. In the File menu, look for Save As… or Export….
To convert files to HGR, try Angry Birds or another comparable tool in the "Game Model Asset 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 HGR converter.