XmlFormat
… a most simple tool to format xml files.
It uses .NET's XmlDocument to load and then save the xml file again, which is then with an applied formatting.
Build
It can be build with a .NET SDK (3.0.100 or newer) by running dotnet build.
Usage
Supply the to be formatted files as command line arguments. XmlFormat accepts multiple files:
xmlf ./file1.xml ../folder1/file2.xml ./file.xml.ref