How to use iPhone grammar check and replace errors
Your iPhone can check spelling, identify some grammar problems and suggest cleaner wording while you type. These tools work in Mail, Messages, Notes, Safari search fields and many other apps, so you can fix mistakes before sending a message or publishing a post.
The process is mostly automatic, but the available controls can be easy to miss. A red underline usually points to a spelling issue, while a blue or other coloured underline may indicate a grammar or usage suggestion. Tapping the marked word can reveal the correction.
The exact behaviour depends on your iOS version, keyboard language and the app you are using. An iPhone set to English (Australia) may make different spelling choices from one set to English (United States), particularly with words such as “organise”, “favourite” and “centre”.
This guide explains how to activate the relevant settings, accept or reject corrections, create your own shortcuts and troubleshoot inaccurate suggestions. The steps apply to current iPhone software, although menu names can vary slightly between iOS releases.
Turn on spelling and grammar assistance
Open Settings, tap General, then select Keyboard. Look for Check Spelling, Auto-Correction, Predictive and, on supported iOS versions and languages, options related to inline predictions or text suggestions. Turn on the features you want to use.
Check Spelling identifies words that may be misspelled. Auto-Correction can replace a recognised typo as you finish a word or insert a space. Predictive displays possible next words above the keyboard and can also offer alternatives to what you have typed.
These controls affect the Apple keyboard across many apps, but they do not override every app’s own editor. A word processor, email client or social platform may use a separate correction system. If an error is ignored in one app but marked in Notes, the difference may come from the app rather than the iPhone.
You can also check the keyboard languages under Settings > General > Keyboard > Keyboards. Add English (Australia) if you want Australian spelling suggestions. When typing, touch and hold the globe or emoji key to switch between installed keyboards.
Read the marks beneath your words
A spelling error is commonly shown with a red dotted underline. Tap the word to see a suggested replacement, then tap the suggestion to insert it. If the word is correct, you may be able to dismiss the suggestion by tapping elsewhere or choosing an option such as Learn Spelling, depending on the context and iOS version.
Grammar suggestions are handled differently from simple spelling corrections. The iPhone may highlight a phrase, punctuation choice or duplicated word and display a proposed edit when you tap it. Grammar checking is language-dependent, so it may be available in English but absent when you switch to a less-supported keyboard.
A suggestion is not automatically right. Names, Aboriginal and Torres Strait Islander language terms, business names, product codes and Australian place names can be flagged even when they are correct. The iPhone has no reliable understanding of every proper noun or local expression.
For example, “Macquarie”, “Parramatta” or “Woolloongabba” may be treated as unfamiliar words. A correction that changes a brand name or a person’s name can be more serious than leaving an underline in place, so review suggested changes before sending an important message.
Replace mistakes while you type
The fastest correction method is to tap the underlined word. The keyboard normally presents a replacement above the keys or directly beside the selected text. Tap the option you want, and iOS will substitute it without requiring you to delete the original letters manually.
If the phone changes a word unexpectedly, tap the backspace key immediately. In many situations, iOS will restore the version you originally typed. You can then continue writing, or tap the original spelling if it appears as an alternative.
For a more deliberate edit, touch and hold the text area until the magnifying cursor appears. Drag the handles to select a word or phrase, then use Replace if that option appears. You can type the corrected version yourself when the keyboard does not offer a suitable suggestion.
Grammar and spelling tools are most useful in short messages, but they can also help with longer writing. In Notes or Mail, reread the complete sentence after accepting a suggestion. A replacement may be grammatically valid while changing your intended meaning, tone or level of formality.
| iPhone feature | What it changes | Where to find or use it | Best use |
|---|---|---|---|
| Check Spelling | Flags words that may be misspelled | Settings > General > Keyboard | Finding typing errors |
| Auto-Correction | Replaces recognised mistakes as you type | Settings > General > Keyboard | Fast everyday messages |
| Predictive text | Suggests words or phrases | Above the keyboard | Finishing common sentences |
| Text Replacement | Converts a shortcut into saved text | Settings > General > Keyboard > Text Replacement | Repeated phrases and addresses |
| Look Up | Provides dictionary or web information | Select text, then tap Look Up | Checking an unfamiliar word |
| Dictation | Converts speech into text | Microphone key on the keyboard | Drafting without typing |
Create replacements for repeated text
Text Replacement is separate from grammar checking, but it is one of the most useful ways to prevent repeated typing errors. Go to Settings > General > Keyboard > Text Replacement, then tap the plus button.
Enter the complete phrase in the Phrase field and the shortcut in the Shortcut field. For instance, you could save your full email address and use a short combination such as “@@”. You might also create shortcuts for a postal address, a regular sign-off or a frequently used technical term.
Choose shortcuts that are unlikely to appear in normal words. A short combination such as “addr” may expand accidentally when it forms part of another word, while a distinctive shortcut is less likely to cause surprises.
Text Replacement is stored with your keyboard settings and may synchronise through iCloud if the relevant settings are enabled. If a saved shortcut appears on one Apple device but not another, check that both devices use the same Apple Account and have keyboard data synchronisation available.
This feature is particularly practical for Australian addresses, mobile numbers and common workplace phrases. It can also help with local spelling by storing “organisation”, “licence” or “travelling” when Auto-Correction repeatedly changes them to an unwanted variant.
Fix unwanted automatic changes
When Auto-Correction keeps making the wrong choice, first check the selected keyboard language. Tap the globe key while typing and choose the appropriate English keyboard. A US English keyboard may prefer “color”, “favorite” and “license”, whereas Australian writing generally follows British-style spelling in many everyday contexts.
You can reset the learned keyboard dictionary by opening Settings > General > Transfer or Reset iPhone > Reset > Reset Keyboard Dictionary. This removes custom words and learned shortcuts from the keyboard. It does not delete your photos, apps or other personal files, but it does remove words the keyboard has learned over time.
Use this reset carefully. If you often type names, industry terms or local place names, you may need to teach them again. It is usually better to add reliable terms to Text Replacement or accept a correct word manually before resetting the entire dictionary.
You can also disable Auto-Correction while keeping Check Spelling enabled. This gives you visual warnings without allowing the iPhone to replace words automatically. It is a useful arrangement for people who write technical documents, use multiple languages or regularly enter model numbers and unusual names.
Check limits, privacy and app behaviour
Built-in grammar assistance does not provide a full editorial review. It may miss awkward wording, repeated ideas, incorrect facts and punctuation problems that depend on the meaning of a whole paragraph. Treat it as a typing aid rather than a substitute for proofreading.
If checking stops working, confirm that the keyboard language supports the feature and that Check Spelling is switched on. Test the same sentence in Notes, because some third-party apps restrict Apple’s standard editing controls. Restarting the app can also help when suggestions stop appearing.
Dictation has its own error patterns. Names, street addresses and Australian suburb names can be transcribed incorrectly, particularly in noisy places such as a Sydney train platform or a busy Melbourne café. Review dictated text before sending it, especially when it includes numbers or delivery details.
Privacy settings and processing methods can vary by feature and iOS release. Read the current information in Apple’s settings and privacy documentation if you are handling confidential work. Avoid assuming that a grammar suggestion guarantees that text has been checked in the same way across every app.
For purchases and support in Australia, Apple’s standard warranty is separate from rights under the Australian Consumer Law. A grammar feature not working is generally a software troubleshooting matter, while a wider keyboard or device fault may require support. If an iPhone was bought from an Australian retailer, keep the receipt and understand that consumer guarantees can apply independently of a manufacturer warranty.
Make corrections before sending important text
For a quick message, tapping a suggested word is usually enough. For an email, job application, school assignment or customer complaint, use a slower review process: check the spelling marks, read each sentence aloud and confirm that names, dates, prices and locations have not changed.
Pay special attention to words that sound alike, such as “your” and “you’re”, or “there”, “their” and “they’re”. Automatic grammar tools can sometimes choose a grammatically possible word that does not match your meaning. A final human read is still the safest way to catch that type of mistake.
If an important document contains many corrections, copy the text into Notes or another editor and review it in sections. This makes it easier to spot changes that are not obvious while you are looking at a small keyboard screen. Zooming the text or turning the iPhone sideways can also make longer paragraphs easier to inspect.
Australian readers should check dates and measurements as well. The iPhone may not correct an incorrectly typed date, postcode, temperature or currency amount. Grammar checking can improve the words around a figure, but it cannot confirm that the figure itself is accurate.
Turn on spelling and automatic correction for ordinary typing, then adjust the settings when they interfere with specialised work. With the right keyboard language and a few carefully chosen Text Replacement shortcuts, the iPhone can catch everyday errors without taking control of your writing. Save these settings alongside your preferred proofreading routine and use them whenever you compose messages, notes or emails on your device.