In the actual Notes application there are menu choices for changing the font of a note. However, this doesn't change the default font for new notes. There is also no Preference.../Settings... where the default font can be changed.

Does anyone know how to change the default font of the Notes app on MacOS Sierra and/or High Sierra etc.


Yes. You have to close out of the Notes application and go to the Notes app in the Applications folder. Right-click on the Notes app and select 'Show Contents" From inside the Contents folder open the Resources folder and inside this folder is a folder named en.lproj. This is for the English language. Other similar folders exist for other languages. Inside this folder is a file named DefaultFonts.plist. Edit this file. The file is locked so editing it can be tricky.This link has a full description of how to do it all. The link will fill in missing details.

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    Why the downvote? It looks helpful to me. Of course, you'll have to copy the Notes app to somewhere in your home directory and then use that instead of the system one. – SilverWolf Oct 19 '17 at 19:59
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    yes, why the downvote? it answers the question! – jmh Oct 19 '17 at 20:02
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    Didn't put the downvote myself, but doesn't seem to work. I knew the workaround worked for the previous notes app, but doesn't seems, unfortunately, to do anything in the current one.. – K3it4r0 Oct 19 '17 at 20:40

Try this

defaults write com.apple.Notes DefaultNoteFont '<62706c69 73743030 d4010203 04050618 19582476 65727369 6f6e5824 6f626a65 63747359 24617263 68697665 72542474 6f701200 0186a0a4 07081112 55246e75 6c6cd409 0a0b0c0d 0e0f1056 4e535369 7a65584e 5366466c 61677356 4e534e61 6d655624 636c6173 73234032 00000000 00001010 80028003 5f100f4d 61726b65 7246656c 742d5468 696ed213 1415165a 24636c61 73736e61 6d655824 636c6173 73657356 4e53466f 6e74a215 17584e53 4f626a65 63745f10 0f4e534b 65796564 41726368 69766572 d11a1b54 726f6f74 80010811 1a232d32 373c424b 525b6269 72747678 8a8f9aa3 aaadb6c8 cbd00000 00000000 01010000 00000000 001c0000 00000000 00000000 00000000 00d2>'

This sets the default font to Market Felt 18 points

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