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Tutorial9 August 2025by Chuhao Liu

Overlay Sunflower AI live captions on PowerPoint slides

Capture your PowerPoint slide show in OBS, overlay Sunflower AI captions, and send the combined picture to your projector. 23 steps, around two minutes.

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A PowerPoint slide showing through OBS with Sunflower AI Chinese captions overlaid

Step 1: Download OBS

From obsproject.com.

OBS download page

Step 2: Click “Slide Show” in PowerPoint

Clicking Slide Show in PowerPoint

Step 3: Rename the scene and add a source in OBS

Rename the item in OBS Scenes to Live Caption. Click Add in OBS Sources.

Renaming the scene to Live Caption and clicking Add in Sources

Step 4: Click “macOS Screen Capture”

For Windows, use the corresponding alternative.

Selecting macOS Screen Capture from the Sources menu

Step 5: Change Name to “PPT” and click “OK”

Naming the source PPT

Step 6: Click “Window Capture”

Switching the source method to Window Capture

Step 7: Pick the PowerPoint slide-show window

Click [Microsoft PowerPoint] PowerPoint Slide Show – [Your Slide Title].

Picking the PowerPoint slide-show window from the list

Step 8: Click “OK”

Confirming the window capture selection

Step 9: Click “Add” in OBS Sources again

Clicking Add in Sources again to add the captions source

Step 10: Click “Browser”

Selecting Browser from the Sources menu

Step 11: Delete the default URL

Clearing the default URL in the browser source

Step 12: Click “Enter Room” in Sunflower AI

Go to your Sunflower AI web app and click Enter Room.

Entering a room in the Sunflower AI web app

Step 13: Click “Start Session”

Starting a session in Sunflower AI

Step 14: Click “Share”

Clicking Share in the Sunflower AI room

Step 15: Click “Caption View”

Selecting Caption View from the share menu

Step 16: Select the language for captions

Selecting the caption language

Step 17: Copy URL

Copying the caption URL

Step 18: Paste URL into OBS

Pasting the caption URL into the OBS browser source

Step 19: Click “OK”

Confirming the browser source URL

Step 20: Adjust size and position of the two sources

Resize and reposition the PPT and Sunflower AI Captions sources.

Adjusting the size and position of both sources in OBS

Step 21: Open “Full-screen Projector”

I put captions below PPT so they don’t block slide content. But if you leave dedicated empty space in the lower third of PPT, you can overlay the captions source onto the slide source in OBS. Once the adjustment is done, right-click Live Caption in Scenes and click Full-screen Projector (Scene).

Right-clicking the Live Caption scene to open Full-screen Projector

Step 22: Pick the output screen

Click the screen you want to output the combined sources of captions and PPT.

Picking the output screen for the projector

Step 23: You’re live

The screen you selected will show PPT with overlaid captions. You can control slides on your computer screen.

Final result: PowerPoint slides with Sunflower AI captions overlaid

Need a hand?

Contact support@sunflowerai.io if you need help. You can also join our Facebook group for feature requests and updates.