How do I make a presentation understandable when someone cannot hear the speaker?

Make sure a person can follow the main ideas without needing to hear your narration, but that does not mean turning every slide into a transcript. Put the key message, important terms, instructions, and conclusions the audience needs in the deck or a handout. Use small, readable chunks, and do not make an image the only way to convey important text. [S2]

A useful test is: if I removed the spoken explanation, could someone still identify the topic, understand the essential point, and know what action or conclusion follows? If not, add the missing information in writing. Put extra examples or detailed explanations in a companion handout when they would overcrowd a slide. Treat this as a coverage plan, not a guarantee that one format suits every audience.

Make a simple speech-to-materials map before editing. For each section, note what the audience must learn or do, then identify where that information will appear: on a slide, in a handout, or in both. Include spoken details that affect meaning—such as a definition, qualification, step, or explanation of what a chart shows—instead of trying to reproduce every sentence.

For example, suppose a slide shows a three-stage process and you normally explain aloud what happens between stages. A coverage entry could be: “Stage 1: [action]. Stage 2: [action]. Stage 3: [action]. Transition: [what changes between stages].” Add the actual transition on the slide or handout if understanding the sequence depends on it.

Live captions can be another way to convey speech, but do not treat them as the sole plan. PowerPoint for Microsoft 365 offers live captions or subtitles with spoken- and display-language choices and appearance settings. Microsoft says the feature uses a cloud-based speech service and needs a fast, reliable internet connection; its guidance also recommends speaking deliberately and reducing background noise. Check instructions for your specific PowerPoint version and environment before relying on it. The guidance does not establish that captions are error-free or replace prepared written materials. [S1]

Prepare the deck or handout first, then test captions as an additional option if they suit the presentation. Check the displayed language, text size, and placement, and whether the setup works in the room or online environment you will use. If the connection or caption feature is unavailable, your written materials should still cover the essential points.

Review the slides and handout in sequence, comparing them with your talk outline. For each important chart, diagram, or image, add enough nearby text to explain the information the audience needs; do not leave essential wording only inside an image. For embedded video, Microsoft’s guidance says captions or subtitles need to be encoded in the video. It also notes that some media optimization or presentation-to-video operations may not preserve those captions, so check the finished presentation after any such operation. [S2]

Use this coverage checklist:

1. Write down the essential point and any necessary explanation for each talk section.
2. Confirm that key terms, instructions, sequence, and conclusions appear in the deck or handout.
3. Check that charts and images are not the sole carriers of important text or meaning.
4. If using live captions, verify the version, languages, appearance, connection, and presentation setup beforehand. [S1]
5. Check embedded-video captions in the final file and after any conversion or optimization. [S2]

A compact planning template is: “Section: [name] | Spoken point needed: [idea] | Written location: [slide/handout] | Visual or video check: [check] | Ready: [yes/no].”