Guide

Here's the quick version: tell Jupjup what you know, hover words on any Korean page, watch with clickable subtitles, and review what you save. It takes about three minutes. If something's not working, jump to the fixes.

Getting started

1. Say how many words you know

The first time you open Jupjup, it asks how many Korean words you know. A rough guess is fine. Pick the closest one and hit Start. Jupjup uses this to decide which words to underline. You can change it later in Settings, and fix individual words on the Words page.

Jupjup's Home page asking: I know the 600 most common words, with a Start button

2. Hover a word on any Korean page

Open any page with Korean on it and rest your mouse on a word. A card pops up with the meaning and how the word is put together. When a sentence has just one word you don't know, Jupjup underlines it in green. That's your next word.

+ Save word keeps it, along with the sentence it came from, so it shows up in your reviews.
Know means you've got this one. It stops being underlined.
Details opens the full breakdown, grammar included.

A Korean article with 지난주 underlined and its word card open, showing the meaning 'last week' and the buttons Save word, Know, and Details

3. Watch with clickable subtitles

On YouTube or Netflix, switch on Korean captions. Jupjup swaps them for its own clickable line, in the same spot and font. Rest your mouse on a word to look it up. The video pauses while you're on the subtitles and carries on when you move away.

A YouTube video with Jupjup's Korean subtitle line, a word card, and buttons at the bottom, and a note at the top left saying 73% of this video's words you know, 437 new — Shout-out to **Didi (디디)** and **정태웅** for making awesome videos. This screenshot is from this one.

Missed something? Press A to jump back a line.
All words lists every word in the line. History shows earlier lines, so you can replay one.
Hide subtitles brings back the original captions. Alt+Shift+S (Option+Shift+S on a Mac) turns Jupjup's subtitles off and on.

Close-up of Jupjup's subtitles: 기억이 is underlined, its card shows the meaning memory with Save, Know, and Details, and the buttons Previous line, All words, History, and Hide subtitles sit below the line

4. Review a little every day

A few minutes a day is plenty. Open Review (the green button in the toolbar popup) and you'll see a sentence with your word highlighted. Try to remember what it means, press Space to check, then tell Jupjup how it went: 1 Again, 2 Hard, 3 Good, 4 Easy. The easier it was, the longer until you see it again.

A review card after pressing Space: the sentence with the word highlighted, its meaning, and how it's built

Where things are

Click the Jupjup icon in Chrome's toolbar to get to any of these.

Home: your word count, today's reviews, and your progress.
Review: today's cards.
Library: everything you've saved. Search, edit, or delete.
Words: what you know and what you're learning.
Settings: underlining, subtitles, Anki, and your data.

When something isn't working

I don't see any underlines

Reload the page. Pages that were already open when you installed Jupjup need a refresh.
Click the Jupjup icon and check that "Jupjup on this site" is ticked.
Underlines are rare on purpose. Out of the box, only a sentence with exactly one new word gets one. In Settings → Underline you can allow two or three new words, or every word you don't know.
If the Korean is in a picture, it isn't text yet. Try "Read Korean in images" in Settings. It's experimental.

Hovering doesn't show a card

Check Settings → "Word cards on hover". It shouldn't be on "Only while I hold Shift" or "Off".
You can also Alt-click (Option-click on a Mac) a word to open its full card, or select some Korean text and press the button that appears.
Chrome doesn't let extensions run on some pages, like its own settings pages and the Web Store.

No subtitle bar on YouTube or Netflix

Turn on Korean captions in the video's own subtitle menu. Jupjup reads those, so if a video has none, there's nothing to show. YouTube's automatic Korean captions work too.
In Settings, check that "Replace Korean subtitles with Jupjup's clickable subtitles" is ticked.
Try Alt+Shift+S (Option+Shift+S on a Mac). You may have hidden them with the Hide subtitles button.
Reload the video page after installing or updating Jupjup.

The video won't pause, or won't start again

Jupjup pauses the video while your mouse is on the subtitles or a word card, and starts it again when you move away. If that isn't happening, look at Settings → "Pause while my mouse is on the subtitles". And if you paused the video yourself, Jupjup leaves it paused.

Saving doesn't keep the audio

Audio is off until you turn on "Record the line's audio when I save from subtitles" in Settings. Jupjup records by replaying the line once, so it can't do it on Netflix, Disney+, or Prime Video. They block it.

A meaning looks wrong

When a word has several meanings, Jupjup shows the most common one first and lists the rest under "Also". If it's still wrong, press Something wrong? on the card. You can set your own meaning for that word, and you can send the report so it gets fixed for everyone. Nothing is sent unless you press Send.

I'm switching computers

Your data lives in this Chrome profile, on this computer, and uninstalling Jupjup deletes it. Before you switch, open Settings and press Download backup under "Your data". On the new computer, install Jupjup and press Restore from backup.

Something else

Write to hello@getjupjup.com and tell me what you were doing and on which site. A screenshot helps a lot.

For what changed in each version, see What's new. For what happens to your data, see Privacy.