System tower · floor

How to turn off autocorrect when it is three settings

How to turn off autocorrect sounds like one switch and is at least three, sitting together on the same screen and producing different symptoms. Turning off the wrong one changes nothing. And before any of them, there is a feature that may remove the reason you came.

“In iOS 17 and later, Auto-Correction temporarily underlines words that it corrects. To quickly edit an auto-correction, tap the underlined word and choose an option from the pop-up menu.”

Before turning anything off, this is worth knowing, because it changes the problem. The phone tells you what it changed, and the correction is one tap from being undone.

That underline is the answer for anybody whose real complaint is “it changed a word and I did not notice”. It does not stop the correction; it makes the correction visible and reversible for a moment, which for most typing is a better arrangement than switching the feature off and losing the corrections you did want.

If you do want it off, the screen is the same one for all three, and it is worth knowing which is which before you start flipping switches.

Three separate settings on one screen

Settings › General › Keyboard

The third of those is the one that produces the strangest complaints, because it does not behave like a spellchecker. Text Replacement is a list that somebody added to, and Apple describes it exactly: enter the shortcut and “your chosen word or phrase automatically replaces it”. Auto-Correction, by contrast, is described as correcting misspelled words from a dictionary. The two definitions give you a test: a substitution that is identical every single time comes from the replacement list; one that varies with the word comes from Auto-Correction. That tells you which screen to open.

And a faster way into that screen than Settings. Apple gives it for predictive text and it works from wherever you are typing: “Touch and hold the smile emoji or the globe icon”, then tap Keyboard Settings.

That is the same keyboard screen, reached without leaving the message you were writing — which matters, because the moment you want to change this is usually the moment it has just done something you did not want.

The word that decides whether any of this will help: dictionary. Apple says Auto-Correction works from your keyboard dictionary — not from a fixed list of English words, but from one attached to you.

Apple does not describe on that page how the dictionary comes to hold what it holds, and this floor will not invent an account of it. What the word does establish is narrower and still useful: the corrections are not coming from a universal list, which is why two phones can disagree about the same sentence.

That is worth holding on to before turning the whole thing off in irritation. Advice that worked on somebody else’s phone may not describe yours, and a correction that seems inexplicable is not evidence that the feature is broken — the list it is working from is not the same list.

A note on where this floor stops. Everything above is quoted from Apple and applies to an iPhone. The same three ideas exist elsewhere under different names and in different places — a Mac keeps them in System Settings, and Android and Windows each have their own arrangement — and those are separate floors rather than assumptions made here.

The floors below take it four ways: the underline that may be enough, the three switches, the replacement list that is not autocorrect, and the dictionary underneath all of it.

Where to start

Four ways in.

“It changed a word and I did not see.”
Start at the underline
“I turned it off and it still happens.”
Go to the three switches
“One word always becomes the same phrase.”
That is text replacement
“Why does it keep correcting this name?”
That is the dictionary

The underline

Since iOS 17 the phone marks what it changed. For a lot of people this removes the reason to turn anything off at all.

Tap the underlined wordWhat the pop-up offers, and how long the underline stays.Being built
Correcting after the factWhen the message has already gone, and what can still be done about it.Being built
Keeping the useful correctionsThe argument for leaving it on with the underline rather than switching it off.Being built

The three switches

One screen, three features, three different symptoms. Knowing which is which is most of the job.

Auto-CorrectionThe spellchecker itself, its dictionary, and the default Apple states.Being built
Predictive textThe suggestion bar, what it learns from, and the extra switch in iOS 18.Being built
Capitals and punctuationThe smaller switches on the same screen that get blamed on autocorrect.Being built

Text replacement

Not a correction feature. A list of shortcuts that expand — and the source of every substitution that is exactly the same every time.

Finding the listWhere it lives, how to read it, and how to delete an entry.Being built
Using it deliberatelyThe version where it saves time rather than causing confusion.Being built
Always the same, or differentThe one test that tells you which of the two features you are fighting.Being built

The dictionary

Apple says the corrections come from your keyboard dictionary. That one word explains most of the differences between two phones.

Why it corrects that nameA word the list has not accepted yet, and what changes that.Being built
Resetting the dictionaryThe smaller reset in the same menu as the larger ones.Being built
The other resets nearbyWhat else sits on that screen, from mild to irreversible.Open this floor →

What this tower will not do

It will not tell you autocorrect is one setting. Apple documents three on the same screen, and they fail in different ways.

It will not assume the substitution is a correction. If it is identical every time, it is a text replacement, and turning off Auto-Correction will not touch it.

And it will not describe the Android or Windows versions from memory. Those are separate floors, and this one says so rather than guessing. What holds instead is simple: the three settings, the underline behaviour in iOS 17 and later, the shortcut into the keyboard screen and the text replacement feature are quoted from Apple’s own documentation, listed below.

Where this page got its facts

  1. Apple Support — How to use Auto-Correction and predictive text on your iPhone, iPad, or iPod touch (the definition of Auto-Correction and its use of your keyboard dictionary, the statement that it is on by default, the underline behaviour in iOS 17 and later with the tap-to-edit pop-up, predictive text and what it draws on, the inline predictions switch in iOS 18, the touch-and-hold shortcut into Keyboard Settings, and the Text Replacement feature with its GM example). Published date given on the page: 30 March 2026 — support.apple.com, read 22 August 2026.

Written by Alberto Gulotta

Founder and editor of AI Tools Primer, writing from Palermo, Italy. Thirty-five years of taking computers apart, starting with a Commodore 64 — the long version is on the about page.

Something wrong on this page? Write to aitoolsprimer@gmail.com and it gets fixed.

Written on 22 August 2026.

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