02 How do I optimize the file size and color depth of symbols with IrfanView?

  • If not already known, download Irfan View.
  • Press B for batch/stack conversion
  • Select Batch Conversion
  • Select PNG as destination format
  • Set the options for PNG
  • Select Special Options
  • Set the special options

    For Color depth select either 2 (black/white) or 16 (color).
  • Select the source directory
  • Select the destination directory
  • Start the conversion