til/unix/convert-svg-to-favicon.md

Convert SVG To Favicon

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

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