ExtLab Dual Subtitles for Language Learning

Two subtitle lines at once for language learners, for YouTube™ and Netflix®. Click any word for its meaning, and save it.

Learn a language from the videos you already watch. ExtLab Dual Subtitles shows every line twice: a big line in the language you are learning, and a small line in the language you know, so you can check. It works both ways. A Spanish video shows its own Spanish lines. An English video is translated into Spanish, with the English under it. Click a word you do not know, see what it means, and keep it. FREE • Two subtitle lines at once on YouTube™, in the normal player, in theater mode, in full screen and on Shorts • Choose the language you learn and the language you know, with search. One key, W, swaps them • AI translation with a daily allowance of about an hour of video. After that, Basic translation: the site's own subtitles, then Chrome's on-device translator where your browser supports it • Click a word for its meaning, or drag across words to pick a phrase • Keys to go back, repeat a line and jump to the next one: A, S and D • Pause after each line, and a mode that hides the small line until you point at it • Saved words with their sentence and a link to that moment • CSV export made for Anki • Size, position, background, font and colors, from a quick panel on the video PRO • A larger allowance for AI translation with Claude, which reads the lines in context • Word explanations for the sentence you are in • Saved words synced between your browsers • Dual subtitles on Netflix®, with every line translated before it shows Pro is a yearly license from Gumroad for 24 USD per year. AI has daily and monthly limits on every plan. WHAT IT DOES NOT DO • It records no video or audio. • It does not touch DRM. • It offers no subtitle file download. • A video with no subtitles has nothing to show, and the extension says so. Live streams are not supported. PRIVACY AI translation is on by default. It sends the subtitle lines of the video, or the word and line you picked, to our API and to Anthropic, which runs the Claude model. Switch to Basic translation in the menu, and no subtitle text goes to us. We keep answers in a cache for a limited time, under a hash, without the original text. ExtLab is not affiliated with YouTube, Google or Netflix. YouTube is a trademark of Google LLC. Netflix is a trademark of Netflix, Inc. Screenshots show Tears of Steel, (CC) Blender Foundation, mango.blender.org, licensed CC BY 3.0.