Turn Off Auto Correct in Mac OS X Lion
To turn off auto-correct in Mac OS X Lion, open System Preferences, select Language & Text, click the Text tab, and uncheck the box next to “Correct spelling automatically.� This setting disables the automatic correction feature system-wide, so words you type will no longer be silently changed while you work in most applications.
What Auto-Correct Does in Lion
Mac OS X Lion (10.7) introduced a system-wide auto-correction feature that works across nearly every app that uses text input, including Mail, TextEdit, Pages, and even web forms in Safari. When enabled, the system compares what you type against its internal dictionary and automatically replaces words it thinks are misspelled. For example, typing “teh� becomes “the� instantly, and “recieve� becomes “receive� before you even press the spacebar.
This feature is separate from the older “Check spelling while typing� option, which only underlines potential errors in red without changing them. Auto-correction goes a step further by making the replacement automatically. It also includes smart quotes and dashes, which can convert straight quotation marks into curly ones and double hyphens into em dashes—a behavior some users find just as annoying as the word replacements.
Why You Might Want to Turn It Off
While auto-correct can be helpful for fast typists, it often causes frustration. Common complaints include:
- Technical terms, jargon, or proper names being changed to dictionary words (e.g., “MacBook� becoming “Mac book�).
- Words in other languages being “corrected� to English equivalents.
- Accidentally accepted corrections that are difficult to undo, especially in long documents.
- Smart punctuation altering the formatting of code, quotes, or mathematical expressions.
For writers, programmers, or anyone who types specialized vocabulary, the feature can do more harm than good. Disabling it gives you full control over what appears on screen.
How to Turn Off Auto-Correct in Lion
Follow these steps to disable the feature completely:
- Open System Preferences from the Apple menu (the logo in the top-left corner) or the Dock.
- Click Language & Text (it may also be labeled “Language & Text� or “Keyboard� depending on your system version—in Lion it is Language & Text).
- Select the Text tab at the top of the window.
- Uncheck the box next to “Correct spelling automatically.�
- Close System Preferences. The change takes effect immediately for most apps.
If you only want to disable auto-correction in a single application, you can often do so from that app’s Edit menu under Spelling and Grammar—but the system-wide setting above is the most reliable way to stop it everywhere.
What If the Setting Doesn’t Work?
In some cases, a specific app may have its own auto-correction setting that overrides the system preference. For example, Pages and TextEdit have their own “Automatic substitution� options. If you still see unwanted changes after disabling the system-wide setting, check the app’s preferences:
- In Pages, go to Pages > Preferences > Auto-Correction and uncheck the relevant boxes.
- In TextEdit, go to TextEdit > Preferences > New Document (or Open and Save) and uncheck “Correct spelling automatically� under Options.
- In Safari, the system-wide setting usually applies, but you can also check the Edit menu for spelling options.
If the problem persists, restart the application you are using. Some apps cache the setting at launch.
How to Undo a Single Auto-Correction
If you prefer to keep auto-correct on but want to revert an individual change, you can press Command (⌘) + Z immediately after the correction happens. This undoes the replacement and restores your original typing. Alternatively, hover over the corrected word (on some systems) and click the small underline to see the original suggestion, then choose “Change Back.�
This is useful when auto-correct occasionally gets it right but you still want to override it for a specific instance.
Auto-Correct in Later macOS Versions
If you have upgraded from Lion to a newer version of macOS, the location of the setting has changed. In OS X Mountain Lion (10.8) and later, the option is under System Preferences > Keyboard > Text, with the same checkbox. In macOS Ventura and newer, it is under System Settings > Keyboard > Text Input > Edit—look for “Correct spelling automatically.� The behavior remains the same, but the menu paths differ.
Knowing this can help if you are following older tutorials that reference Lion’s Language & Text pane.
Frequently Asked Questions
Will turning off auto-correct affect spell checking?
No. Disabling “Correct spelling automatically� only stops the automatic replacement of words. The red squiggly underline that indicates a misspelling will still appear if you have “Check spelling while typing� enabled. You can still right-click a misspelled word to see suggestions.
Can I turn off auto-correct for just one app?
Yes, in many apps you can disable it locally. For example, in TextEdit, go to Edit > Spelling and Grammar and uncheck “Correct Spelling Automatically.� However, this only affects that app; the system-wide setting in System Preferences remains on for other apps.
Why does my Mac still change words after I unchecked the box?
Check if the app you are using has its own auto-correction setting that is separate from the system one. Apps like Pages, Keynote, and Microsoft Word often have their own substitution features. Also, make sure you are looking at the correct preference pane—in Lion it is Language & Text, not Keyboard.
Does auto-correct work in all languages?
Auto-correction uses the system’s dictionary for the languages you have enabled in Language & Text. If you type in a language not in that list, it may not correct anything, or it may incorrectly apply English rules. You can add languages in the Input Sources tab.
Is there a way to add words to the dictionary so they aren’t corrected?
Yes, you can right-click a word that is underlined in red and choose “Learn Spelling.� This adds it to your user dictionary, and auto-correct will no longer change it. You can manage learned words in System Preferences > Language & Text > Text, under the “Learnings� list.
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