In PowerPoint for Windows, you can add closed captions to audio files in your presentations. Adding closed captions makes your presentation accessible to a larger audience, including people with hearing disabilities and those who speak languages other than the one used in your audio file.
To read about best practices for accessibility, see Make your PowerPoint presentations accessible to people with disabilities.
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Download and install the STAMP add-in
To add captions to an audio file in PowerPoint you need to use the STAMP add-in. For instructions, refer to Download and install STAMP.
Note: Both the linked article and the STAMP add-in download page only discuss versions up to PowerPoint 2016. However, the latest version of the add-in also works in PowerPoint 2019 and the latest Microsoft 365 version of PowerPoint.
Technical support for customers with disabilities
Microsoft wants to provide the best possible experience for all our customers. If you have a disability or questions related to accessibility, please contact the Microsoft Disability Answer Desk for technical assistance. The Disability Answer Desk support team is trained in using many popular assistive technologies and can offer assistance in English, Spanish, French, and American Sign Language. Please go to the Microsoft Disability Answer Desk site to find out the contact details for your region.
If you are a government, commercial, or enterprise user, please contact the enterprise Disability Answer Desk.