PowerPoint Spell Check Language: How to Switch to UK English Globally

When you type in PowerPoint, the spell checker might underline correct UK English words like “colour” or “centre” as errors. This happens because the default proofing language is set to US English. Changing the language for each text box individually wastes time. This article explains how to switch the spell check language to UK English across all slides in a single presentation or as your default for all new presentations.

Why PowerPoint Uses US English by Default

PowerPoint inherits its proofing language from the Office installation settings. When you install Microsoft 365 or Office on a computer with a US English locale, the default proofing language for all apps, including PowerPoint, is set to US English. This means the dictionary, grammar checker, and thesaurus all use US spelling and rules.

Even if you change the display language or the editing language in Windows, the proofing language inside PowerPoint remains US English until you explicitly change it. The proofing language is stored per text run, not per slide or per file. This is why changing the language on one text box does not affect others. To switch globally, you must apply the change to every text element on every slide or change the default for all new files.

Steps to Change Spell Check Language to UK English for a Single Presentation

Use this method if you want to fix the spelling language for one existing presentation only. It applies UK English to all text on all slides, including text in placeholders, text boxes, tables, and shapes.

1. Open the presentation in PowerPoint
   Navigate to the View tab on the ribbon and click Slide Master. This opens the master view where you can edit all slide layouts at once.
2. Select all text in the Slide Master
   Press Ctrl + A to select every element on the current slide master layout. Then press Ctrl + A again to select all elements on all layouts in the Slide Master view. The entire master slide and all its child layouts will be selected.
3. Set the proofing language to UK English
   Go to the Review tab and click Language, then Set Proofing Language. In the dialog box, scroll down and select English (United Kingdom). Click OK.
4. Return to Normal view
   Click Close Master View on the Slide Master tab. All text that used a layout placeholder now uses UK English proofing. However, any text you typed directly in a text box (not a placeholder) may still use US English.
5. Fix individual text boxes if needed
   Select any remaining text boxes that still show US English errors. Press Ctrl + A to select all text inside the box. Then go to Review > Language > Set Proofing Language and choose English (United Kingdom). Repeat for each text box.

Steps to Set UK English as the Default Proofing Language for All New Presentations

To avoid repeating the above steps for every new file, change the default proofing language in PowerPoint options. This setting applies to every new presentation you create.

1. Open PowerPoint Options
   Click File > Options. In the left pane, select Language.
2. Check the authoring language section
   Under Office authoring languages and proofing, look for English (United Kingdom). If it is not listed, click Add a Language, select English (United Kingdom), and click Add.
3. Set UK English as the proofing language
   In the same section, find the row for English (United Kingdom). Under the Proofing column, click the link that says Not enabled or Proofing available. If it says Not enabled, click it and select Enable. Then click Set as Preferred to make UK English the default proofing language.
4. Apply the change
   Click OK to close the Options dialog. Restart PowerPoint. All new blank presentations will now use UK English for spell check.

If the Language Change Does Not Stick

PowerPoint reverts to US English after reopening the file

This usually happens when the template or theme file stores the original language. Open the presentation again, go to View > Slide Master, select all, and set the proofing language to UK English. Then save the file as a new template: File > Save As > PowerPoint Template (potx). Use this template for future presentations.

Spell check still underlines UK English words as errors

The proofing language may not have been applied to all text runs. Select the entire presentation by pressing Ctrl + A in Normal view. Then go to Review > Language > Set Proofing Language and choose UK English. This step is effective only if the selection includes all text elements. For text inside tables or SmartArt, you may need to select each object individually.

UK English does not appear in the language list

The language pack for UK English is not installed. Close PowerPoint. Open Settings > Time & Language > Language & Region in Windows. Under Preferred languages, click Add a language, select English (United Kingdom), and install it. After installation, restart PowerPoint and repeat the steps to set the proofing language.

PowerPoint Language Change Methods Compared

Item	Set Proofing Language in Slide Master	Set Preferred Language in Options
Scope	Current presentation only	All new presentations
Applies to existing text	Yes, if text uses placeholders	No, only new files
Requires restart	No	Yes
Works for text boxes	Partially, manual fix may be needed	Yes, for new text boxes
Best for	Fixing one file quickly	Changing default for all future work

To switch UK English for all existing presentations, you must apply the Slide Master method to each file. The Options method only affects new files. For a permanent solution, combine both: set UK English as the preferred language in Options, then use the Slide Master method to fix any existing presentations.