By default, the export resolution of a PowerPoint slide that you want to save as a picture is 96 dots per inch (dpi). To change the export resolution, follow these steps:
Exit all Windows-based programs.
Right-click Start, and then select Run.
In the Open box, type regedit, and then select OK.
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Locate one of the following registry subkeys, depending on the version of PowerPoint that you're using:
PowerPoint 2016, 2019, PowerPoint for Microsoft 365
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\PowerPoint\Options
Select the Options subkey, point to New on the Edit menu, and then select DWORD (32-bit) Value.
Enter ExportBitmapResolution, and then press Enter.
Make sure that ExportBitmapResolution is selected, and then select Modify on the Edit menu.
In the Edit DWORD Value dialog box, select Decimal.
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In the Value data box, specify a resolution of 300. Or, use the parameters from the following table.
Decimal value Full-screen pixels (horizontal × vertical) Widescreen pixels (horizontal × vertical) Dots per inch (horizontal and vertical) 50 500 × 375 667 × 375 50 dpi 96 (default) 960 × 720 1280 × 720 96 dpi 100 1000 × 750 1333 × 750 100 dpi 150 1500 × 1125 2000 × 1125 150 dpi 200 2000 × 1500 2667 × 1500 200 dpi 250 2500 × 1875 3333 × 1875 250 dpi 300 3000 × 2250 4000 × 2250 300 dpi Select OK.
On the File menu, select Exit to exit Registry Editor.