What is a GCH file?
A .GCH file is a Precompiled Header File used by the GNU Compiler Collection (GCC). The GNU Project maintains GCC. Developers use .GCH files to speed up the compilation of large C and C++ projects. When the compiler reads a standard header file, it generates a .GCH file. The next time the compiler runs, it reads the precompiled .GCH file instead of parsing the original text header. This process saves significant time during software development.
Alternative uses for GCH files
A .GCH file can also be a Game Client History or crash report file used by Wargaming.net titles. These files store logs and error data generated when a game client crashes. Because .GCH has multiple possible meanings, it can be difficult to know what your file contains.
How to open and inspect GCH files?
Standard text editors like Notepad++ or Visual Studio Code can open plain text game crash reports, but they cannot read compiled binary headers from GCC. You can use viewer.online/gch to analyze .GCH files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Best practices and troubleshooting
If your compiler ignores a .GCH file, check the file timestamp. GCC requires the precompiled header to be newer than the original source file. Do not share precompiled headers between different compilers or architectures, because the binary format depends on the specific machine. If you want to force the compiler to regenerate the header, simply delete the old .GCH file.
Summary
viewer.online/gch is useful for identifying, inspecting, and understanding .GCH files without installing software or dealing with compatibility problems. If you do not know whether your file is a compiler asset or a game log, this tool quickly reveals the internal structure and format.