Romanyt - Romanize for YouTube Captions

About

Romanyt – Romaji for YouTube Captions
Learning Japanese from YouTube just got easier. Romanyt automatically displays Hepburn romaji below Japanese captions as you watch, so you can follow along even when kanji and kana are moving faster than you can read them.

What it does
Romanyt detects Japanese subtitles on any YouTube video and overlays a romaji reading directly beneath each caption line — in real time, with no manual steps. It uses a full morphological tokenizer (kuromoji) to break Japanese text into words before converting, so readings are accurate rather than character-by-character guesses. Kanji, hiragana, and katakana are all handled.

Four display modes
Both: Japanese caption on top, romaji below (great for active learners)
Romaji only: hides the Japanese and shows only the romanized text
Japanese only: turns the extension off without uninstalling it
Off: disables all changes to the page

Customisable colours
Pick any colour for the romaji text from a set of presets or enter your own hex code, so it always stands out against the video background.

Who it's for
Beginners who haven't learned kana yet and want to get started with real content
Intermediate learners building reading speed through shadowing and listening practice
Anyone studying Japanese who wants to watch native YouTube content without constantly pausing to look up readings

Completely private
Everything runs locally in your browser. No data is collected, no account is needed, and nothing is sent to any server.