How-to

Why iPhone autocorrect changes words you typed correctly, and how to stop it

Published 3 October 2026 · 5 min read

You typed the word you meant. You pressed space. Now it says something else. It is the most common complaint about phone keyboards, and it has a few specific causes — each with a fix.

Why it happens

Every autocorrect makes the same bet thousands of times a day: is the word you typed what you meant, or is a nearby word more likely? It weighs where your finger landed against which words are common, and which words usually follow the ones before. When it is confident enough that you slipped, it swaps the word as you press space.

The bet goes wrong in predictable places:

• Words it does not know. Names, places, brand names, slang, technical terms. To a dictionary that has never seen your colleague’s surname, it looks like a typo of something common.
• Your other language. If you write in two languages but the keyboard thinks you are in one, every word from the other looks misspelled.
• Short words. With three or four letters, one wrong key produces another real word, and the keyboard has very little to go on.
• What it learned from you. A keyboard that learns can learn a mistake, too, and then offer it back.

The underlying trade-off is real: a keyboard that corrected nothing would never change a correct word, and would never fix a typo either. The goal is not zero corrections. It is corrections that back off when you mean what you typed.

Five fixes on Apple’s keyboard

1. Undo it straight away

Apple says words are added to the keyboard dictionary when you reject the words iPhone suggests as you type. So when a correction is wrong, take it back immediately rather than retyping the word later; that is the signal the keyboard learns from.

2. Protect a word with Text Replacement

For a word it keeps changing, Apple documents a specific trick. Go to Settings › General › Keyboard › Text Replacement, tap the plus button, type your word in the Phrase field, and leave the Shortcut field blank. Apple describes this as the way to stop a word or phrase you use being replaced.

3. Tell it about your second language

If the words being changed are from another language you write, add that language as a bilingual keyboard: Settings › General › Keyboard › Keyboards › Add New Keyboard, then Add to [language] Keyboard where the option exists. Apple says the keyboard then switches automatically between the two languages you use most. Our guide to typing in two languages on iPhone covers what to do when your pair is not supported.

4. Reset the keyboard dictionary, as a last resort

Settings › General › Transfer or Reset iPhone › Reset › Reset Keyboard Dictionary. Apple says this “erases only the words you’ve added”. It is all of them at once, though: the useful words go with the bad ones, and the keyboard starts learning you again from nothing.

5. Turn Auto-Correction off

In Settings › General › Keyboard, switch off Auto-Correction. Predictions still appear above the keyboard, but nothing is changed unless you tap it. Some people are happier this way; the trade is that typos stay exactly where you left them.

A different approach: a keyboard that backs off

The fixes above all work around the same design: a keyboard that corrects first and asks you to clean up afterwards. Pilcrow, the keyboard we make, starts from the opposite rule.

• A word that exists is left alone. On held-out text, Pilcrow changes a correctly spelled word fewer than 7 times in 1,000, while still restoring 61–72 % of words typed with a genuine slip. Both are quoted at the worst end of the range across the languages it ships.
• Undo once, and it is remembered. Backspace straight after a correction, or tap the undo chip, and that correction is never applied to that word again — not just for this message.
• Your word stays visible. When it does correct, the word you actually typed sits in the suggestion bar, one tap away.
• Names stay names. Your contacts are consulted, so a name you type every day is not corrected into something else. Nothing is copied anywhere, and the keyboard has no networking code to send it with.
• Every language you write counts as a real word. Enable several and it tells them apart word by word, so your other language is not treated as a string of typos.
• You can see what it learned. Words, spellings, phrases, corrections you accepted and ones you refused are a list you can open from the keyboard, and delete or edit one line at a time. If a refusal was a slip of the thumb, it is released when you fix the word by hand or simply write it correctly a few times.

One tap for the whole message

Sometimes the problem is the opposite: you typed fast, left several slips, and pressed send before noticing. Pilcrow has a tool for that too. One tap re-reads everything you have typed, repairs it, and tells you how many words it changed; one more tap puts them all back if you disagree.

Still being corrected?

If you use Pilcrow and a word you added yourself is changed anyway, that is a bug we want to hear about. Write to info@pilcrowtype.com with the word and the sentence around it; we never need anything else you typed. If you are deciding whether to switch at all, Pilcrow vs the iPhone keyboard sets out what changes and what does not.

Sources

1. Apple, Reset iPhone settings to their defaults (Reset Keyboard Dictionary; how words are added)
2. Apple, Set up shorthand for frequently used text on iPhone (Text Replacement with a blank shortcut)
3. Apple, Type with the onscreen keyboard on iPhone (turning auto-correction off)
4. Apple, Add or change keyboards on iPhone (bilingual keyboards)