Base64 encoding is built into many programming language these days, or available as easy to install add-ons. It is built-into python's standard library if you are a Unix/linux/mac os X person; I believe it is also built into Microsoft dotnet's too.
If you don't want to do your own little programming task, there is a stand-alone tool called "base64" (!) which is part of GNU coreutils. You could probably download some binaries for whatever platform you are on, by searching for "gnu coreutils".
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Go to the folder your font file is in using the “cd” command, and then type:
This will create a text file next to your font file containing the Base64 string.
If you don't want to do your own little programming task, there is a stand-alone tool called "base64" (!) which is part of GNU coreutils. You could probably download some binaries for whatever platform you are on, by searching for "gnu coreutils".