If you create presentations that contain text in more than one language, PowerPoint may apply incorrect proofing tools or mispronounce words during reading. The root cause is that PowerPoint does not automatically detect the language of individual words or phrases within a single text box. By default, it uses the language set for the entire text box, which can cause spell-check errors and accessibility issues for screen readers. This article explains how to mark the language of specific text spans in PowerPoint to ensure correct proofing and proper pronunciation.
Key Takeaways: Marking Text-Span Languages in PowerPoint
- Select text > Review > Language > Set Proofing Language: Assigns a specific language to a selected portion of text within a text box.
- File > Options > Language > Add a language: Installs proofing tools for languages not already available on your system.
- Select text > Review > Language > Set Proofing Language > Default: Changes the default proofing language for all new presentations.
Why You Need to Mark Text-Span Languages in PowerPoint
PowerPoint treats each text box as a single language container. When you type or paste text that contains multiple languages, the entire text box uses the language set in the proofing settings. This causes the spell checker to flag correctly spelled words in secondary languages as errors. Screen readers also rely on language tags to pronounce words correctly. Without explicit language marking, a screen reader might pronounce a French phrase using English phonetics, making the content unintelligible for users who depend on assistive technology.
Marking text-span languages is not a cosmetic change. It directly affects the accuracy of the built-in spell checker, thesaurus, and hyphenation tools. It also ensures that the presentation meets accessibility standards such as WCAG 2.1, which requires that the language of each passage or phrase can be programmatically determined.
Steps to Mark Text-Span Languages in PowerPoint
The process works the same in PowerPoint for Microsoft 365, PowerPoint 2021, and PowerPoint 2019. You can mark any contiguous text selection with a different language, regardless of the text box’s default language.
- Open the presentation and select the target text
Click inside the text box that contains the multilingual text. Select the specific word, phrase, or paragraph that is in a different language. For example, select the French phrase within an otherwise English slide. - Go to the Review tab and open the Language menu
On the ribbon, click the Review tab. In the Language group, click Language, then select Set Proofing Language from the dropdown menu. - Choose the correct language from the dialog
In the Language dialog box, scroll to find the language you want to assign to the selected text. Click the language name to highlight it. If the language is not listed, you need to install the language pack first (see section below). - Click OK to apply the language to the selection
After selecting the language, click OK. PowerPoint applies the proofing language only to the selected text span. All other text in the same text box retains its original language setting.
Installing Additional Proofing Languages
If the language you need does not appear in the Set Proofing Language dialog, you must install the corresponding language pack for Office.
- Open File > Options > Language
In PowerPoint, click File > Options > Language. - Add the language under Office authoring languages and proofing
Under the section Office authoring languages and proofing, click Add a Language. Choose the language from the list and click Add. - Download and install the language pack
After adding the language, you see a status message such as Proofing available or Proofing not installed. If it shows Proofing not installed, click the Install link next to it. Follow the prompts to download and install the language pack. You may need to restart PowerPoint. - Return to the Set Proofing Language dialog
After installation, the new language appears in the Set Proofing Language dialog. Select the text span and apply the language as described earlier.
Changing the Default Proofing Language for All New Presentations
If you frequently work with a specific secondary language, you can change the default proofing language for all new presentations. This does not affect existing slides.
- Open a blank presentation
Start a new blank presentation in PowerPoint. This will become the template for the default language setting. - Set the proofing language on the blank slide
Select all text in any text box placeholder, or simply click inside a text box. Go to Review > Language > Set Proofing Language. Choose the language you want as the default and click OK. - Save the blank presentation as a template
Click File > Save As. Choose PowerPoint Template (potx) from the file type dropdown. Navigate to the default Templates folder. Name the file Blank.potx and click Save. When you create a new presentation from File > New, the blank presentation uses your chosen default language.
Common Issues When Marking Text-Span Languages
The Language I Selected Does Not Affect Spell Check
If you mark a text span with a language but the spell checker still flags words as errors, the proofing tools for that language may not be installed. Go to File > Options > Language and verify that the language shows Proofing available. If it shows Proofing not installed, click the Install link and restart PowerPoint.
The Language Setting Resets After I Close the Presentation
PowerPoint stores language settings per text span within the presentation file. If you open the file on a different computer that does not have the same language pack installed, the language reverts to the default of that system. To avoid this, ensure the target language pack is installed on every computer where the presentation will be edited. For presentation delivery only, the language tags remain embedded in the file and are used by screen readers even if proofing tools are missing.
Screen Reader Does Not Pronounce the Marked Language Correctly
Some screen readers, such as Narrator in Windows 11, require the corresponding text-to-speech voice for the language to be installed. Go to Windows Settings > Time & Language > Speech > Manage voices. Add the voice for the language you marked. Without the voice, the screen reader falls back to the default voice, which may not pronounce the text correctly.
PowerPoint Text-Span Language Marking vs. Full Text Box Language
| Item | Text-Span Language Marking | Full Text Box Language |
|---|---|---|
| Scope | Selected word, phrase, or paragraph within a text box | Entire text box or placeholder |
| Proofing accuracy | Spell check and grammar apply only to the marked span | All text in the box uses one language, causing false errors for other languages |
| Accessibility | Screen readers pronounce each span with the correct voice | Screen reader uses one voice for the entire box, mispronouncing other languages |
| Ease of application | Requires manual selection and setting for each span | Set once per text box via Review > Language or default language |
| Best use case | Slides with mixed-language content, such as quotes, terms, or bilingual paragraphs | Slides where all content is in a single language |
By using text-span language marking, you keep the proofing tools accurate and make your presentation accessible to a wider audience. The feature is available in all modern versions of PowerPoint, including PowerPoint for Microsoft 365, PowerPoint 2021, and PowerPoint 2019.
You can now mark individual text spans with the correct language to fix spell-check errors and improve screen reader pronunciation. After setting the language spans, run the Accessibility Checker from Review > Check Accessibility to verify that language tags are properly applied. For presentations that contain more than two languages, consider creating a custom dictionary to avoid repeated false positives during spell check.