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On the View tab, select Slide Master. Â
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Select a slideand change the formatting and layout as necessary.
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On the File tab, select Save a Copy or Save as, and choose where to save the template.
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Choose PowerPoint Template from the drop-down menu, and select Save. Â
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Open the presentation you want to use as a template.
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On the File menu, select Save as Template.
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In the Save As box, name the new template.
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Next to File Format, select PowerPoint Template (.potx), or, PowerPoint Macro-Enabled Template (.potm) if your presentation contains macros.
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Select Save.Â
Creating and saving a template isn't currently possible in PowerPoint for the web. You can, however, create and save a template in the PowerPoint desktop app.
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To open the desktop app, at the top of the ribbon, select
 Editing and choose Open in Desktop App. ​​​​​​​
Don't have the PowerPoint desktop app? Try or buy Microsoft 365.