The imagemagick convert
CLI tool can convert an SVG file into a transparent
favicon (ICO) file with the different standard sizes.
Assuming the background that we want to make transparent is white, then include
-transparent white
and then to resize the icon include -define icon:auto-resize ...
. Point to the image.svg
to be converted and specify the
name of the output file (favicon.ico
).
$ convert image.svg -transparent white -define icon:auto-resize=16,32,48,64,128 favicon.ico
We can then use the identify
CLI to inspect the favicon.ico
file to see
that the above worked.
$ identify favicon.ico
favicon.ico[0] ICO 16x16 16x16+0+0 8-bit sRGB 0.000u 0:00.002
favicon.ico[1] ICO 32x32 32x32+0+0 8-bit sRGB 0.000u 0:00.004
favicon.ico[2] ICO 48x48 48x48+0+0 8-bit sRGB 0.000u 0:00.004
favicon.ico[3] ICO 64x64 64x64+0+0 8-bit sRGB 0.000u 0:00.004
favicon.ico[4] ICO 128x128 128x128+0+0 8-bit sRGB 99678B 0.000u 0:00.003