You can easily convert Excel .xls or .xlsx files to YAML with Easy Data Transform:
Install Easy Data Transform on your PC or Mac, if you haven’t done so already. It will only take a minute. There is a fully fuctional free trial and you don’t have to give us your email or sign up to anything.
Start Easy Data Transform.
Drag the Excel .xls or .xlsx file you wish to convert onto Easy Data Transform. A pink input item will be added.
Ensuring the pink input item is selected, click the To File button in the left pane (scroll to the bottom of the left pane).
A window will appear. Set the new file name and location. Select YAML file as the file type.
A green output item is added and selected.
The YAML file is created immediately, no need to ‘run’ anything. You can change the YAML file Encoding in the Right pane.