Two subtitle tracks, side by side
Load subtitles in the language you're learning alongside a translation. Compare meaning line by line without leaving the video.
Learn while you watch
Learn languages by watching what you love
Comprendio turns any video with subtitles into a study tool. Watch in the language you're learning, click words you don't know to save them in context, and review your growing vocabulary later — without ever stopping the show.
Open the playerFree · runs entirely in your browser
How it works
Three steps to your first study session
- 01
Pick a video
Choose any video from your computer. Nothing gets uploaded — it plays straight from your drive.
- 02
Load subtitles
Drop in an SRT, VTT, ASS or TTML file, or pick a track embedded inside an MKV.
- 03
Add a translation
Upload a second subtitle file in your native language, or let AI translate the first track for you with one click.
What's inside
Everything you need to study from video
Click any word to save it
Tap an unfamiliar word in the active line and it gets saved with the surrounding sentence as context. Your vocabulary list grows naturally from what you watch.
A–B loop and playback speed
Set an in-point and out-point to replay a tricky line until you catch it. Slow audio down to hear every syllable, or speed it up once it feels easy.
Machine translation on demand
If you only have subtitles in one language, generate a translation in your native language directly inside the player. No need to leave the page or upload anywhere else.
Explain this for tough lines
Hit a keyboard shortcut on any cue to get a detailed explanation of the current scene — grammar breakdown, idioms and slang, plus cultural context so the line lands the way a native speaker hears it.
Bring any video and any subtitles
Drag and drop a local video, pick a subtitle track embedded in an MKV file, or upload SRT, VTT, ASS, or TTML. Everything stays on your machine.
Resume where you left off
The player remembers your playback position, both subtitle tracks, and your saved words per video. Switch between up to five recent videos without losing progress.
Export to CSV for further study
Download your saved words, their sentence context, and any notes you wrote as a CSV file. Import it into Anki, a spreadsheet, or any other tool to keep working on the material.
Merge subtitles for TV playback
Export both tracks merged into a single colour-coded ASS file. Drop it next to the video file on a USB stick or media server and your TV will show original and translated subtitles together, no Comprendio needed.
Pick a video and start learning
No sign-up, no upload, no waiting. Your video and notes stay on your device.