How to convert a JPEG or PNG to ICO on the Linux CLI

Introduction

While preparing the OpenGraph and FavIcon images for this, your trusted blog, I needed to convert a PNG to ICO. On Linux it is very easy to do with ImageMagick.

Steps

Install ImageMagick:

sudo apt install imagemagick

Convert the PNG or JPEG (256x256px) to ICO:

convert input.png -define icon:auto-resize=256,64,48,32,16 favicon.ico

Where:

• -define icon:auto-resize=256,64,48,32,16 saves multiple icons of those sizes in the .ico file.

And that’s it.