.H File Extension

.H File Extension

File Type

C/C++/Objective-C Header File

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Category Developer Files
Format Text

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 do I 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.

Open and view .H files with File Viewer Plus.Free Download

Programs that open or reference H files

Updated June 17, 2020

Verified by FileInfo.com

The FileInfo.com team has independently researched the C/C++/Objective-C Header file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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