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This is a popular open-source tool found on GitHub designed to convert RTPack assets, including RTTEX, into standard image formats.

The tool requires ClanLib 1.X and PowerVR libraries for compilation on Windows, while Linux builds depend on PVRTexLib and ClanLib development packages.

RTPackJS requires Node.js version 14 or higher and provides complete round-trip support—you can decode RTTEX to PNG and encode PNG back to RTTEX.

If you have ever tried to customize textures in the popular sandbox game , you have likely encountered the .rttex file extension. These files are not standard image formats, making them difficult to open, edit, or view with traditional image viewers.

import os import struct from PIL import Image def convert_rttex_to_png(rttex_path, png_path): with open(rttex_path, 'rb') as f: # Read the proprietary RTTEX header (usually 124 bytes or based on magic bytes) magic = f.read(4) if magic != b'RTTX': print(f"Error: rttex_path is not a valid RTTEX file.") return # Seek to width and height offsets (offsets vary by engine version) f.seek(12) height = struct.unpack(' Use code with caution.

Converting (RT-Texture) files to .png is common for players of games like Growtopia or Pixel Worlds