In case you missed it, simply use the slightly longer magick convert command rather than the standalone convert command. On Windows, you must check the (quite explicit) Install legacy utilities (e.g. This approach works on all versions including older ones: convert icon.svg -scale 16 tmp/16.pngĪfterwards, the multiple png files can be packed in the final icon.ico with: convert tmp/16.png tmp/32.png tmp/48.png tmp/128.png tmp/256.png icon.icoĪs a final note: the standalone convert binary is no longer installed by default. The second option is a stepped one, generating various png file in a temporary folder. The first option is a one-liner, suited for current version (v7.0.0+) of convert, is the following one-liner: convert logo.svg -define icon:auto-resize=256,128,48,32,16 icon.ico In this case, one practical approach is to use the vector svg image format as input, as it can generate consistent images of multiple size (like ico files content). Imagemagick contains several image handling utilities, is opensource, free to use, available on multiple platforms (Linux, Windows, Mac Os X, iOS) and can be batched easily for example in Continuous Integration pipelines. It provides image re-sizing to generate multiple size icons, and support various other image manipulation.
The opensource imagemagick convert utility can pack multiple images into one single icon file.
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