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H File - What is an .h file and how do I open it?
Learn about .H files and view a list of programs that open them.
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Overview
What is an H file? An H file is a header file referenced by a document written in C, C++, or Objective-C source code. It may contain variables, constants, and functions that are used by other files within a programming project. H files allow commonly used functions to be written only once and referenced by other source files when needed.
More Information H header files are typically used to store C function declarations, as well as macro definitions, which can be used by multiple source files. Header files can be inserted into a .C source code file using the #include directive. NOTE: H files may also store headers for C++ source code, but those headers are typically saved as .HPP files.
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.H File Extension
C/C++/Objective-C Header File
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NEW: Open your .H file online with File Helper . View Online
What is an H file?
An H file is a header file referenced by a document written in C, C++, or Objective-C source code. It may contain variables, constants, and functions that are used by other files within a programming project. H files allow commonly used functions to be written only once and referenced by other source files when needed.
More Information
H header files are typically used to store C function declarations, as well as macro definitions, which can be used by multiple source files. Header files can be inserted into a .C source code file using the #include directive.
NOTE: H files may also store headers for C++ source code, but those headers are typically saved as .HPP files.
How to open an H file
Since header files are plain text files, you can open and view the file contents in a text editor. However, it's easier to edit *.h files and other source code files using a code editor like Microsoft Visual Studio or Apple Xcode . These editors provide helpful programming tools like line numbers, syntax highlighting, and source code error checking.
Programs that open or reference H files
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Platform
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X
Windows
File Viewer Plus
—
Get it from Microsoft
Free +
Microsoft Visual Studio 2022
Free +
Code::Blocks
Free
Eclipse IDE for C Developers
Free
Embarcadero C++Builder
Free Trial
Borland C++ Compiler
—
Discontinued
Free
BloodshedSoftware Dev-C++
gVim
Free
Any text editor
Mac
Apple Xcode
Free
Code::Blocks
Free
Eclipse IDE for C Developers
Free
GNU Compiler Collection (GCC)
Free
MacroMates TextMate
Free
MacVim
Free
Any text editor
Linux
Eclipse IDE for C Developers
Free
Code::Blocks
Free
GNU Compiler Collection (GCC)
Free
Vi
GNU Emacs
Free
Any text editor
Web
FileHelper.com
Free
Android
File Viewer for Android
Free +
Category: Developer Files
Updated: June 17, 2020