Japanese system-wide spellchecker I am looking for a relatively easy solution for a Japanese spellchecker (not a Japanese dictionary for the Dictionary app) in High Sierra. I would prefer a link to a downloadable spelling dictionary (Japanese websites are okay). 

If there are no ready to use Japanese spelling dictionaries, I would be glad if you could point me to a good step-by-step tutorial for making one.

P.S. I already acquainted myself with everything the official Apple website has to offer on the topic. I checked OpenOffice and LibreOffice for Japanese spelling dictionaries and could not find anything that I could make work. I also tried to look for a solution on Japanese and English websites but so far I did not have any luck.

And of course, I did not forget to make sure that my computer is plugged in, turned on, logged into my account, and connected to the internet. It is :).
If you have .dic and .aff files, just put them Library/Spelling or Home/Library/Spelling, making the folder if necessary.  Apple's instructions are in the setup area of system prefs/keyboard/text/spelling.

I have not seen such files for Japanese, but they may exist somewhere.  MS Word has Japanese Proofing Tools usable with that app.

Some info on how to make spellcheck dictionaries is here.



If you need reference and translation dictionaries, Apple provides those in the Dictionary App: