Lookuber – YouTube Subtitles & Web Dictionary by Weiwei

Lookuber turns subtitles and web text into instant, clickable dictionary lookups.

On YouTube, Lookuber overlays clickable subtitles on top of the video. Turn on captions, click any word, and a dictionary card appears—definitions, phonetics, pronunciation audio, and translation into your chosen language. On any other web page, just select text to look it up the same way.

Never miss a word
Unlike tools that show only the current line, Lookuber keeps previous subtitle lines on screen, so you can go back and look up something you just heard. And the moment you move your cursor onto a subtitle, the video pauses automatically—take all the time you need to read, click, and study, then it resumes the instant you move away. No frantic pausing, no rewinding, no missing the next line.

Features

• 🎬 Clickable YouTube subtitles — full sentences split by punctuation, with word-by-word karaoke highlighting.
• ⏸️ Hover-to-pause — moving onto a subtitle pauses the video automatically and resumes when you leave, so you never miss what comes next.
• 🕘 Subtitle history — previous lines stay on screen so you can look back instead of losing them.
• 🌐 Select-to-look-up on any page — trigger by hover, click, or a hotkey.
• 📚 Multiple dictionaries — Google, Cambridge, Wiktionary, Bing, Jisho, Moedict and more, chosen automatically by your target language.
• 🔊 Pronunciation audio where available.
• 📒 Personal vocabulary book — save words with their sentence and video timestamp; export and import as JSON.
• 🌍 11 interface languages, with an independently selectable translation target (30+ languages).
• 🔒 Privacy-friendly — no data is collected by the developer. Lookups go only to the dictionary you choose.

No account, no sign-up. Just install and start clicking.