# Writing a binary file in little-endian?

**URL:** <https://fortran-lang.discourse.group/t/writing-a-binary-file-in-little-endian/719>\
**Category:** Help\
**Created:** [February 15, 2021, 12:07pm UTC](https://fortran-lang.discourse.group/t/writing-a-binary-file-in-little-endian/719 "2021-02-15T12:07:39Z")\
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**Author:** ![gardhor](https://yyz2.discourse-cdn.com/free1/user_avatar/fortran-lang.discourse.group/gardhor/32/88_2.png) [@gardhor](https://fortran-lang.discourse.group/u/gardhor)\
**Post date:** [February 15, 2021, 3:30pm UTC](https://fortran-lang.discourse.group/t/writing-a-binary-file-in-little-endian/719/4 "2021-02-15T15:30:09Z")

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About the integer sizes.  
Although must of compilers assume the kind is the size, but it is not the case for all of them, nagfor for instance. So yes, you should use ISO\_FORTRAN\_ENV, but I don’t know if int8 or int16 exist.

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