Batch conversion from jpg to PNG

[L i am]

Hi All I am trying to batch convert materials from jpg to PNG. I am using windows image converter. The reason I need to do this is that I have files from Globe plants that need to be converted from jpg
to PNG so I get an alpha channel for the leaves of the plants, there are many images Any way I am hoping somebody here may have some experience with this. I have attached an image.
Seems pretty simple, but when I try to use the option overweight existing it just goes back to "click to choose" I assume that means that it will overwrite the Jpg's with the PNG conversion but I cant make it happen any ideas please?

[Rich O Brien]

I use FFMPEG but that requires some setup via the terminal.

You could use Riot to batch process too...

https://riot-optimizer.com/

JPG to PNG will bloat file size

[Gus R]

I've used the Batch Image Manipulation Plugin with Gimp and it works pretty fast and uses folders. Didn't use it for alpha channels.

This is the link for BIMP: https://alessandrofrancesconi.it/projects/bimp/

[gullfo]

irfanview. https://www.irfanview.com/main_download_engl.htm

[L i am]

Thanks guys