See English and Korean subtitles together on YouTube
Turn on English subtitles and you get stuck on words you don't know.
Switch to Korean and the English is gone. This shows both at once — and
clicking a word gives you its Korean meaning.
Click a word — the video pauses and the meaning appears
YouTube can't do this on its own
Gear icon → Subtitles → Auto-translate lets you switch to any language,
Korean included.
But only one at a time. English means no Korean; Korean
means no English. Flipping between them breaks your flow, and there is no
sign YouTube plans to add a both-at-once option.
What it does
Two subtitle lines
English and Korean on screen together. No switching back and forth.
Click a word
The video pauses and the Korean meaning appears. No dictionary to open.
Senses kept apart
go is a verb, and also a board game. Each sense is shown separately.
Vocabulary list
Words you look up are saved. Click the extension icon to see them all.
No account, no server. Everything it saves stays in your
own browser, and the developer cannot see any of it.
How to use it
Install it with the “Add to Chrome” button above
Open any YouTube video. Two subtitle lines appear on their own
Click a word you don't know. The video pauses and the meaning appears
Pin the icon. From the puzzle-piece icon (🧩) next to Chrome's address
bar, pin this extension — then one click opens subtitle size, position, and your
vocabulary list
When it won't work
Videos with no captions — no extension can invent subtitles that don't exist
Korean-language videos — if the original is already Korean it stays out of the way, rather than printing the same line twice
Subtitles not showing — reloading the page usually fixes it
How it differs from other extensions
There are already good tools here. Honestly:
Language ReactorOver 2 million installs, and it works on Netflix too. If you study several languages or watch Netflix, pick this. It is feature-heavy, which makes it complex at first.
TrancyOften praised for translation quality. Has paid plans.
이중자막 (this one)Built for Korean speakers only. Click a word and you get a Korean meaning, not an English definition. If you only watch English on YouTube, this is the simplest of the three.
Who made it
A first-year middle school student, using vibe coding. It exists because he
got frustrated studying English on YouTube.
Some things probably don't work yet. Try it and tell me what's broken at
novalaps.kr@gmail.com — I'll fix it.