How to add English and Japanese real-time translated subtitles to YouTube. And make it multilingual.

Jun Kudo
5 min readMay 10, 2020



YouTube has a subtitle function that allows you to add English or Japanese subtitles.
However, it can only be displayed in one or the other.

How to add two subtitles is to use PowerPoint online in Microsoft 365 (formerly Office 365).
PowerPoint Online has the ability to pick up the audio of your presentation and transcribe it in real time. It also has the ability to translate in real time. Apply these features and add subtitles.

This is possible with some versions of PowerPoint installation, but it takes a lot of effort.

The advantage of having PowerPoint online is that it’s available for both Windows and Mac.

Setting to import audio (Windows)

(Sorry, some of the UI is Japanese.)

You will first need to set up the settings to capture sound from YouTube.
Once the audio is in the mixer, it will be played to the speakers and PowerPoint.

Select the Stereo Mix, if there is one at the input.

If found, proceed to the next PowerPoint settings section.

If you can’t find it, go to the “Sound Control Panel” and go to the recording tab, show the disabled devices, and enable the Stereo Mix.

If you do not see the stereo mixer, install Voicemeeter from VB-AUDIO Software and substitute it.

Select VoiceMeeter Input for the output and VoiceMeeter Output for the input.

This alone will not produce any audio from the speakers. So, launch the ViceMeeter app.

Click on A1 in the upper right corner and select the speaker you want to play. Make sure you get audio.

This completes the audio capture setup.
I don’t think it’s a problem if you can set the mixer even on a Mac.

PowerPoint settings

Open PowerPoint Online and go ahead with the story in the Chrome browser. I don’t know the behavior of other browsers.

Open a new blank presentation.

Open the slideshow in the menu and set the language of the speaker to the language of the YouTube side. The example has selected English.

For the subtitle setting, select the language you want to display. In the example, I selected Japanese and set it to translate English to Japanese.

Subtitle OFF

Subtitle ON

Turn on the subtitle and click “From the beginning” or “From the current slide” to start the slide show.

It starts with a full screen.

If you want to go out with permission to use a microphone, I will allow it.

You can’t see YouTube itself now, so I’ll remove the full screen.
However, it cannot be released with ESC.
I don’t know if it’s a PowerPoint bug or a browser bug, but I use a small trick.

Press the Windows key,

Or press Alt+Tab.

Make sure you see the taskbar below.
It’s important that the taskbar appears in the front.

Bring the cursor to the top with the taskbar in front of you.
Click on the “X” when it appears.

Verify that the full screen display is canceled.

You will now be able to adjust the size of the display.
That’s it for PowerPoint preparation.

Check on YouTube

All that’s left to do is combine and display the YouTube screen with English subtitles on the YouTube side and a Japanese translation with PowerPoint.

PowerPoint online can be launched in multiple ways.
This is used to display Japanese and Chinese.

Combine this with YouTube and you’re done with multilingualism.


The standard feature on YouTube was that you could only add one subtitle. However, I could only choose between English and Japanese.
So by using PowerPoint, you can translate the language and put it as a second subtitle.
This can be used not only on YouTube, but also on video sites such as Netflix and video conferencing.
It’s a very useful feature, so why not give it a try?



Jun Kudo

I’m Japanese, Microsoft MVP for Azure. Alibaba Cloud MVP. .