A tool to convert your grd or exe graphic diffs to grf files.

-h for a help
-s -v -l Show Sprites in GRD-File
-g <two initials> <firstbyte> <secondbyte> for the ID of GRFID
    (Bytes can be given in 0x## format too)
-1 convert file to one grf
-i "Description" "Copyright" for the GRFID

Place the created grf file in your newgrf(w).txt as the numbers show in the filename
Don't forget DOS can handle only 8+3

Name Size Last modified Description
grdtogrf043.tar 22 KiB 2022 01 14 11.96 KiB 2022 01 14
license.txt 1.53 KiB 2022 01 14
changelog.htm 1.55 KiB 2022 01 14