Dual subtitle tracks
Use available Netflix tracks or YouTube captions and auto-translate. Set the languages once, then keep watching.
Chrome extension · Dual subtitles for Netflix and YouTube
A calmer way to learn from what you already watch.
Dubstack keeps the useful language tools close to the subtitle line and leaves the rest of the player alone.
Free dual subtitles and lookup. No account required.
While you watch
Two lines that behave like one.
Choose the language you are learning and a translation. Dubstack keeps them synchronized, places the learning language first, and waits until both lines are ready before hiding the player's normal captions.
On YouTube, rolling auto-captions are translated as complete pairs so the second line does not arrive on its own several seconds later.
Native-caption fail-safe
The player's captions remain visible until Dubstack has subtitle cues of its own. Missing tracks do not leave an empty screen.
Position and appearance
Adjust size, width, background, and top or bottom placement without rebuilding the video player around a control panel.
When a line is difficult
Look at the phrase, not another tab.
Click a word or drag across a phrase. Dubstack pauses the video, keeps the full subtitle nearby, and continues when you close the panel.
Premium can add a short note about grammar, idioms, or tone when a direct translation still misses the point.
A little active practice
Useful controls, without turning the screen into homework.
Blur the translation
Try the original line first, then reveal the second line on hover when you want to check yourself.
Replay the current line
Alt-R returns to the start of the current subtitle, without dragging the player timeline.
Save the whole context
Keep the word, translation, and subtitle sentence together, then export to CSV or Anki.