For strict brand compliance, Beautiful.ai is my go-to. It handles PPTX export...

https://future-wiki.win/index.php/My_PowerPoint_Export_Changed_Fonts:_The_Professional%E2%80%99s_Guide_to_Preflighting_Your_Decks

For strict brand compliance, Beautiful.ai is my go-to. It handles PPTX export and font substitutions reliably, unlike most AI tools that break layouts upon download