It’s very straightforward and the quality is much better than various online tools

• Install first InkScape and next ConversionSVG.
• Run ConversionSVG,
• Select the output “Format”  = .PNG,
• Select the “Exportation Zone” = Dessin
• Set the desired “Size” for the output images.
• Select the “Folder” containing the svg images to be converted
• Select bellow the target folder to store the converted images.
• Click “Convert“

Et voilà 😉