Twinline – Dual Subtitles for YouTube

Dual-language subtitles on YouTube. Click any word for its meaning and save it to your word list.

Twinline helps you learn languages while watching YouTube: the original and the translated subtitles show together, and any word is one click away from its meaning. DUAL SUBTITLES • Original and translation shown together, replacing YouTube's own captions • The original is always the language spoken in the video; the translation prefers the creator's human-made subtitles and falls back to machine translation • Auto-generated captions are rebuilt into full sentences at the speaker's pauses, with the translation aligned to them • Translate into 14 languages, including Spanish, Portuguese, French, German, Italian, Russian, Japanese, Korean, Vietnamese, Indonesian, Turkish and Chinese CLICK ANY WORD • Click an English word in the subtitles: the video pauses and a card shows its pronunciation and meaning • Built-in offline dictionaries answer instantly: English definitions for about 38,000 words, or Chinese meanings for about 48,000 • Inflected forms resolve to the base word (went → go, children → child) WORD LIST • Save a word with its sentence, translation and the moment in the video • Export to Anki in one click (File → Import), or as CSV for Excel BUILT FOR LEARNING • Subtitles pause the video while your pointer is on them • Shortcuts: A previous sentence, S replay, D next sentence • Subtitles and the word card scale up in fullscreen • YouTube's CC button turns the dual subtitles off too PRIVACY • No personal data collected, no analytics, no ads • Your word list stays in your browser • Runs only on youtube.com Questions or feedback? Reach me at the developer email on this page.