This option can be used when you occasionally want auto-correction in an individual document and not system-wide. Misspelled words are automatically corrected (unless they begin with a capital letter or appear alone on a line). Manual spell and grammar check options Correct spelling as you type: Choose Edit > Spelling and Grammar > Correct Spelling Automatically (a checkmark shows it's on). You do have to remember to proof read as OS X can make mistakes in the autocorrection process. Select the option to 'Correct spelling automatically.' All incorrect words are corrected as you type. Automatic spell and grammar check option Set a system-wide option to correct spelling automatically in all apps that support it: Choose Apple menu > System Preferences, click Keyboard, then click Text. For do-it-yourselfers, you also can perform a spell check manually using the Spelling and Grammar option available in the 'Edit' menu in many apps. For those who prefer correction on-the-fly, you can configure OS X to check and fix mistakes automatically as you write. The spell and grammar check feature in OS X can be used in two very different ways, depending on whether you prefer automatic or manual correction. These options are hidden in the system preferences and app menus, but they can be particularly useful once you discover them. Though it is not touted as a flagship feature, OS X ships with several useful tools that spell and grammar check your documents as you write.
