How to Fix OneNote Proofing Language and Spelling Errors
Question details
Users experience inconsistent spell-checking in OneNote, where correctly spelled words are underlined as errors due to conflicting proofing language settings.

- 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.
Ensure you have the necessary language packs installed for Microsoft Office and verify that your system keyboard matches your intended typing language.
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.
Open OneNote and navigate to File > Options > Language. Under 'Office authoring languages and proofing', select English and click 'Set as Preferred'.
Highlight the words or paragraphs with red underlines, right-click the text, and select 'Set Proofing Language' (or Language) to English.
Ensure your Windows system input method (keyboard layout) in the taskbar is set to English while typing in these sections.
Review Proofing and Custom Dictionary Settings
Ensure OneNote's proofing settings aren't overriding your language preferences or missing crucial custom dictionary entries.
Experience Seamless Multilingual Typing with WPS Office
Tired of dealing with complex proofing settings and formatting inconsistencies? Try WPS Office. It provides a straightforward, lightweight word processor with smart spell-check that supports multiple languages effortlessly, alongside full compatibility with Microsoft Office formats.
- 1. Download and Install: Visit the official WPS website to download and install the free WPS Office suite.
- 2. Open Your Documents: Launch WPS Writer and open your existing text documents to experience seamless editing.
- 3. Set Spell Check Language: Navigate to the Review tab, click on Spell Check, and easily set your preferred default dictionary language.

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.




