- Videos teach best when you already know almost every word you hear and read.
- Same-language subtitles beat none, and a few swapped words beat a full foreign track.
- Words you meet in videos stick only if you see them again within days.
Why subtitles help at all
Reading and listening at once gives you two chances to catch a word. A 2013 meta-analysis of captioned video found clear gains in both listening and vocabulary compared with no captions.
The catch is difficulty. Reading research puts comfortable understanding at about 98% known words, and video is no kinder: if half the line is new, you watch the pictures instead.
Pick the track for your level
Hand-made tracks beat auto-generated ones: they have punctuation, fewer mistakes and lines that end where the sentence does.
Choose videos you would watch anyway
A video you skip after a minute teaches nothing. Pick channels you already like, then turn on subtitles, so the habit costs no willpower.
Short videos with one speaker and a clear topic are easier than films with fast dialogue and slang.
Let a few words come to you
NativeLingo swaps a few words in each YouTube subtitle line into the language you learn, at your level and in the right form. Hover a word to see the original, and the rest of the line stays easy.
The subtitle text stays in your browser. Ads and live streams keep their own subtitles.
Keep the words you meet
Seeing a word once rarely makes it stick. Words you met in videos join your word list and come back in a short typed review, just before you would forget them.
Questions
Below B1, your language with a few swapped words works better. From B1 on, switch to subtitles in the language you learn.
They work, but hand-made tracks are cleaner. Use auto-generated ones when nothing else exists.
One you actually enjoy is better than three you force. Ten minutes a day adds up.