To enable autocorrect on an iPhone, open Settings > General > Keyboard and toggle the Auto-Correction switch to green. It’s turned on by default.
One wrong tap sends the text early. The process to enable autocorrect on an iPhone takes about ten seconds and lives inside the Settings app. Here is how to turn it on, customize it, and fix it when it stops working.
What Does Auto-Correction Actually Do on an iPhone?
Auto-Correction checks every word you type against a built-in keyboard dictionary and automatically replaces misspelled words. When you type “teh,” it changes it to “the” before you hit send. The dictionary learns your regularly used vocabulary over time, including names and slang you use often.
This feature is separate from Predictive Text, which shows word suggestions above the keyboard. People often confuse the two. Predictive Text guesses the next word you might want to type, while Auto-Correction fixes words you already typed incorrectly.
How to Enable Auto-Correction on an iPhone (The Exact Steps)
The official way to turn on Auto-Correction is through the Settings menu. The steps are identical on any iPhone running iOS 12 through iOS 18, which covers every model from the iPhone 5s to the latest iPhone 16 series.
- Open the Settings app on your iPhone.
- Tap General.
- Tap Keyboard.
- Locate Auto-Correction in the “All Keyboards” section.
- Tap the toggle switch to turn it On (the switch turns green).
That is all it takes. When you return to your messaging app and start typing, misspelled words should correct automatically. If they don’t, one of the conflicts below is likely the cause.
Why Isn’t My iPhone Autocorrect Working? (Common Mistakes)
If the toggle is green but typos still go through unchecked, a conflicting setting is almost always responsible. Here are the four most common reasons.
Mistake 1: You Disabled the Wrong Setting
Predictive Text (the word bar above the keyboard) is frequently mistaken for Auto-Correction. Turning off Predictive Text does not disable spelling fixes. You must ensure that the Auto-Correction toggle is the one that is green. They are two separate switches in the same menu.
Mistake 2: A Text Replacement Shortcut Is Blocking It
If you have set up a Text Replacement (for example, typing “omw” to insert “on my way”), that shortcut overrides Auto-Correction for that specific phrase. Even if the shortcut looks like a typo, the system prioritizes it. To fix this, go to Settings > General > Keyboard > Text Replacement and delete the conflicting shortcut.
Mistake 3: The Keyboard Language Is Wrong
Auto-Correction uses the dictionary for the active keyboard language. If your primary keyboard is set to Spanish or French but you type in English, the corrections will look wrong. Check your keyboard list at Settings > General > Keyboard > Keyboards and make sure the correct language is listed first.
Mistake 4: The Keyboard Dictionary Learned an Error
Sometimes the dictionary picks up a persistent misspelling. If it keeps changing a correct word to an incorrect one, the dictionary needs a reset. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Keyboard Dictionary. This wipes everything the dictionary learned and restores the factory vocabulary.
| Problem | Likely Cause | The Fix |
|---|---|---|
| Autocorrect is on but nothing changes | The wrong toggle is enabled (Predictive Text is on instead) | Turn on Auto-Correction specifically |
| A specific word is always changed incorrectly | A Text Replacement shortcut or a learned dictionary error | Delete the shortcut or reset the keyboard dictionary |
| Corrections look like a different language | Wrong primary keyboard language selected | Set the correct language in Keyboards settings |
| Autocorrect keeps repeating the same mistake | The on-device dictionary is corrupted | Reset the keyboard dictionary entirely |
What Are the New Autocorrect Features in iOS 17 and iOS 18?
Recent versions of iOS added visual cues and smarter text predictions. These changes do not require a separate setup, but knowing about them helps when troubleshooting unexpected behavior.
- iOS 17: Corrected words now appear with a temporary underline. Tapping the underlined word opens a pop-up menu with editing options, so you can revert a correction instantly.
- iOS 18: Inline predictive text appears directly in the text line as you type. This is a separate toggle called Inline Predictions in the same Keyboard settings menu.
These features build on the standard Auto-Correction engine and do not replace it. The core toggle that fixes misspelled words is still Auto-Correction.
| Setting | Location | What It Does |
|---|---|---|
| Auto-Correction | Settings > General > Keyboard | Automatically fixes misspelled words as you type |
| Predictive Text | Settings > General > Keyboard | Shows word suggestions above the keyboard |
| Check Spelling | Settings > General > Keyboard | Highlights misspelled words with a red underline |
| Inline Predictions (iOS 18) | Settings > General > Keyboard | Predicts the next word inline as you type |
| Auto-Capitalization | Settings > General > Keyboard | Capitalizes the first word of each sentence automatically |
Final Autocorrect Setup Checklist
Use this quick checklist to confirm your iPhone is set up to catch typos reliably.
- Is the Auto-Correction toggle switched to on (green)?
- Does your active Keyboard Language match the language you actually type in?
- Have you reset the keyboard dictionary if it learned persistent bad corrections?
- Is Predictive Text set to your personal preference (optional, but not responsible for fixing spelling)?
If you checked yes to all four, your iPhone will handle the heavy lifting of fixing typos automatically with no further adjustments needed.
References & Sources
- Apple Support. “Use Auto-Correction and predictive text on your iPhone, iPad, or iPod touch.” Official documentation for enabling and using Auto-Correction on iOS 12 through 18.
- Letterly App. “How to Fix iPhone Autocorrect Not Working (2025 Guide).” Covers keyboard language conflicts and dictionary reset steps.
- Apple Community. “Edit iPhone auto-correct.” Discusses Text Replacement conflicts with Auto-Correction.