If you want to create hash of file in windows, this article will provide necessary information for you.
You have an important file and you sent this file to someone else. If you want to know if this file has been changed later, you can hash it using powershell.
You can hash the file using the algorithm you want (sha256-md5).
In the example below, you can create hash of file using the sha256 algorithm. After opening Powershell, you can use the following command.
Get-FileHash C:\frk\frk.txt -Algorithm sha256