Office Settings & Configuration

How to Fix OneNote Proofing Language and Spelling Errors

Adam DavisAdam Davis Oct 29, 2026 869 views

Question details

Users experience inconsistent spell-checking in OneNote, where correctly spelled words are underlined as errors due to conflicting proofing language settings.

How to Fix OneNote Proofing Language and Spelling Errors
Product
Microsoft OneNote
Device & OS
not provided
Scenario
Typing, pasting text, or working within specific sections and table cells where multiple display and proofing languages (e.g., English and Swedish) are configured.
Observed behavior
OneNote incorrectly underlines valid English words with red squiggly lines because individual sections, columns, or pasted content unexpectedly retain a different proofing language.
Before you start

Ensure you have the necessary language packs installed for Microsoft Office and verify that your system keyboard matches your intended typing language.

Solution 1Recommended

Set Default Proofing Language and Manually Adjust Text

Update the default Office language settings to English and apply the correct language to specific sections or affected text.

OneNote often inherits proofing languages from the system keyboard or pasted text, leading to a mix of languages within a single note. Unifying these settings resolves most spelling errors.

1
Set Office Preferences

Open OneNote and navigate to File > Options > Language. Under 'Office authoring languages and proofing', select English and click 'Set as Preferred'.

2
Correct Existing Text

Highlight the words or paragraphs with red underlines, right-click the text, and select 'Set Proofing Language' (or Language) to English.

3
Check Input Method

Ensure your Windows system input method (keyboard layout) in the taskbar is set to English while typing in these sections.

Quick Language Toggle: Pressing Windows Key + Spacebar allows you to quickly toggle between installed keyboard languages to match the language you are currently typing in.
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  3. 3. Set Spell Check Language: Navigate to the Review tab, click on Spell Check, and easily set your preferred default dictionary language.
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Frequently Asked Questions

Why does OneNote change the proofing language when I paste text?

OneNote often preserves the source formatting of pasted text, including its original proofing language. To prevent this, right-click and use the 'Keep Text Only' paste option to adopt the language settings of your current notebook section.

How do I stop OneNote from automatically detecting languages?

OneNote relies heavily on your Windows keyboard input language to determine the proofing language. Switching your Windows keyboard layout to your target language is the most effective way to manage automatic detection. You can also disable automatic language detection in the Review > Language settings if available in your version.

Can I set a specific proofing language for just one table cell?

Yes. Simply highlight the text inside the specific cell or text box, go to the Review tab, click Language, select 'Set Proofing Language', and choose your preferred language for that specific content block.