How to Get Spell Check on Microsoft Word (And Make It Work the Way You Need)
Spell check is one of Word's most reliable features — but it doesn't always behave the way users expect. It can be turned off accidentally, work differently depending on your version or platform, or quietly skip certain types of text. Understanding how it actually works helps you get consistent results instead of chasing random red underlines.
How Spell Check Works in Word
Word uses two overlapping systems: spell check (which flags words not found in its dictionary) and grammar check (which flags sentence-level issues). Both run together under a feature Microsoft calls Editor in newer versions of Word, or simply "Spelling & Grammar" in older ones.
By default, Word checks spelling as you type, underlining suspected errors in red and grammar issues in blue or green depending on the version. It can also run a full document check on demand via the Review tab or by pressing F7.
The spell check feature works by comparing your text against a built-in dictionary for your selected language. If a word doesn't match, it gets flagged — which means technical terms, brand names, proper nouns, and abbreviations often trigger false positives.
How to Turn Spell Check On in Word
If spell check isn't running, it's likely been disabled somewhere in the settings. Here's how to re-enable it:
On Windows (Microsoft 365 / Word 2016–2021):
- Go to File → Options → Proofing
- Under When correcting spelling and grammar in Word, check:
- ✅ Check spelling as you type
- ✅ Mark grammar errors as you type
- Make sure "Hide spelling errors in this document only" is unchecked
- Click OK
On Mac (Word for Mac):
- Go to Word → Preferences → Spelling & Grammar
- Enable Check spelling as you type
- Enable Check grammar as you type if needed
On Word Online (browser version): Spell check runs automatically and cannot be fully disabled by the user. If it's not appearing, check your browser's language settings or try a different browser.
Why Spell Check Might Not Be Working
Several factors can cause spell check to stop functioning even when it appears to be enabled:
Document language is set incorrectly. If the text is marked as a different language — or as "Do not check spelling" — Word will skip it entirely. You can check this by selecting text, going to Review → Language → Set Proofing Language, and confirming the correct language is selected with the "Do not check spelling or grammar" box unchecked.
The text style is set to no-proofing. Some templates apply a "no proofing" flag to certain paragraph styles, like code blocks or footnotes.
Add-ins or third-party tools are interfering. In rare cases, plugins or macros can override proofing settings.
Word is running in a restricted or read-only mode. Spell check doesn't flag errors in protected documents.
Running a Manual Spell Check
If you want to review your entire document at once rather than correcting as you go:
- Press F7 on Windows
- Go to Review → Spelling & Grammar on both Windows and Mac
- Word will walk through each flagged item and offer suggestions, ignore options, or dictionary additions
This is especially useful when you've finished a draft and want a final pass before sharing.
Custom Dictionaries and AutoCorrect
🔤 Word's spell check is only as useful as its dictionary. You can improve accuracy by:
- Adding words to the custom dictionary — right-click a flagged word and select Add to Dictionary to stop it being flagged in future sessions
- Managing AutoCorrect entries — found under File → Options → Proofing → AutoCorrect Options on Windows, this controls which typos get automatically fixed as you type
- Creating or importing custom dictionaries — useful for specialized fields like medicine, law, or software development where standard dictionaries fall short
Custom dictionaries are stored locally by default, so they don't automatically carry over to a new device or a different Microsoft account.
How Spell Check Varies Across Versions and Platforms
| Version / Platform | Spell Check Feature | Notes |
|---|---|---|
| Microsoft 365 (desktop) | Full Editor with AI grammar | Most feature-complete version |
| Word 2019 / 2021 (one-time license) | Spelling & Grammar | Solid coverage, no AI-enhanced suggestions |
| Word Online (browser) | Basic spell check | Limited compared to desktop |
| Word for iPad / Android | Spell check as you type | Settings menu differs from desktop |
| Word for Mac | Full spell check + grammar | Interface varies slightly from Windows |
The Microsoft 365 subscription version receives the most frequent updates to its proofing engine. One-time purchase versions like Word 2019 or 2021 have stable but less frequently updated dictionaries.
Variables That Affect Your Experience
How well spell check performs — and which settings you'll need to adjust — depends on factors specific to your situation:
- Which version of Word you're using (subscription vs. perpetual license)
- Your operating system and whether it's fully updated
- The language and regional dialect set in both Word and your OS
- The type of documents you work with — technical writing, creative writing, and business documents all interact with proofing tools differently
- Whether you share documents with others, since language and proofing settings can travel with a file
Someone writing academic papers with field-specific terminology will configure spell check very differently than someone sending short internal memos. The same feature, meaningfully different use.