HIgh Sierra spell checker can't be disabled I have a Mac with High Sierra (10.13.6) and I am unable to disable the spell checker.

I've tried going to System Preferences -> Keyboard -> Text and unchecking all the boxes but the spell checker still works. Every time I type "echo singlequote" (singlequote was meant to be enclosed in diamonds) the system tries to guess what I'll type next.

I have also disabled System Integrity and renamed the /System/Library/Services/AppleSpell.service/Contents/Resources directory, but the system still tries to guess my typing every time I use quotes.

I don't have the issue on another machine with High Sierra.

I can't type without checking the screen every time I type a single or double quote, or even the ^ symbol. Having to hit the space bar every time I type a quote is driving me mad.

Does anyone know how to stop this spell checker from jumping in every time a type a quote?
Go to System Preferences > Keyboard > Input Sources and make sure you have only one item on the list, and that its name is US or ABC (and not US International PC).

(Note that your problem is not connected to spellcheck.  You are using a special keyboard designed to use various symbols to create the accented characters needed for Spanish, French, German, Italian, etc.)