Sub2Learn is a free tool that translates movie/TV subtitles based on your English level. It translates only the words and lines above your level and keeps the rest in English, so you learn English by watching while only getting help on genuinely new vocabulary.

Is my video uploaded to a server?

No. When you extract subtitles from an MKV/WebM video, the file is read entirely inside your own browser and never leaves your device. Image-subtitle OCR also runs locally. Only the extracted text is sent out for the translation step.

Which subtitle and video formats are supported?

Subtitle files: SRT and ASS. Video files (for in-browser extraction): MKV and WebM. Inside a video, text subtitle tracks (SubRip, ASS/SSA, WebVTT) are extracted directly, and Blu-ray PGS image subtitles are OCR-ed locally. DVD VobSub is not supported yet.

Does it work in mainland China?

Yes. Translation is performed server-side using the Bing translator by default, with automatic Google fallback. Because the server does the fetching, it works even where Google is not directly accessible.

How do the English levels work?

Each level corresponds to a list of the most frequent English words (about 300 for Kindergarten up to about 6000 for CET-6 / High school). A subtitle line whose words are all within your level stays in English; a line with any word above your level is translated in full.

Yes, Sub2Learn is free to use and requires no account or login.

English Level selection support, more movies watching, more English learning!

Turn your favorite shows into a language class by Subtitle Translator Pro!

We translate the difficult bit so you can build your English memory muscle with the rest.

Which file do you have?

📄

I have a subtitle file

Already got an .srt / .ass? Translate only the words above your English level and learn as you watch.

🎯 Graded by CET-4 / 6 & more · only above-level words get translated

Upload subtitle · translate

Works with .srt / .ass files; outputs bilingual or Chinese-only subtitles.

🔒 Local extraction · zero upload

🎬

I have a movie / video file

Pull the embedded subtitles straight out of the movie — including Blu-ray PGS image subs (OCR'd locally) — then translate in one click.

🔒 Your movie is never uploaded · processed entirely in your browser · uses almost no data

Supports MKV / WebM (the usual self-contained movie formats). MP4 / AVI keep subtitles in a separate .srt file — just use "Upload subtitle" on the left.

📄 Upload a subtitle file (.srt / .ass)

Subtitle language：

Translate subtitles to：

No.	From	To	Original Text	Translated Text