Subtitle blur
Turn on subtitle blur to test your listening first (off by default). Hover a line to reveal it when you need help.
Free, open source, no tracking
Sublens
Translate & learn from subtitles
Blur subtitles until you want to read them, then click, Ctrl/Cmd+click or drag-select any word for instant translation, dictionary definitions and pronunciation.
Works on
Netflix
YouTube
Prime Video
Features
Everything you need to learn while watching
Turn the subtitles you already watch into an active language lesson, without leaving the player.
Click to translate
Click a word for its translation and dictionary entry, Ctrl/Cmd+click to add more words, or click-and-drag to select a whole phrase.
Pronunciation
Hear the selected word or phrase in the subtitle language, with a speaker button to replay it. Auto-play can be turned off in the settings.
Auto-pause on hover
Hovering a subtitle pauses the video so you have time to read, and pausing reveals every blurred line at once.
Replay the last line
Press the Left Arrow key to jump back to the previous subtitle and hear it again, instead of the player's default rewind.
Your languages, your rules
Pick the subtitle language or auto-detect it, choose your translation language, and toggle Sublens on Netflix, YouTube and Prime Video independently.
How it works
Three steps, no setup
1
Install Sublens
Add the extension to Chrome. There is nothing to configure to get started.
2
Press play
Open any title with subtitles on Netflix, YouTube or Prime Video. On YouTube, turn captions on with the CC button.
3
Click any word
Hover to reveal a line, then click a word for its translation, definition and pronunciation.
FAQ
Frequently asked questions
Everything you might want to know before installing.
Is Sublens free?
Yes. Sublens is completely free and open source, with no account, no sign-in and no ads.
Does it work with auto-generated captions?
Yes. On YouTube both manual and auto-generated captions are
supported on youtube.com/watch pages, as long as
captions are turned on with the CC button. On Netflix and Prime
Video it uses the title's subtitle track; Prime Video titles
with image-based (bitmap) subtitles fall back to native
captions.
Which languages does it support?
The subtitle (source) language is auto-detected from the active caption track on Netflix and YouTube, or you can set it manually. Prime Video's player exposes no caption-track language, so its source language is auto-detected by Google Translate instead. Translations and dictionary definitions can be shown in any of the supported target languages, picked in the settings popup.
Is my data private?
Yes. Sublens collects no personal data and has no tracking or analytics. Only the word or phrase you actively click is sent to Google Translate to return its translation and pronunciation. See the Privacy Policy for details.
Start learning from what you already watch
Free, private, and works right inside the player.