SubTranslate helps you translate video subtitles instantly while you watch. Click any subtitle word to pause the video and see its translation in a tooltip. Double-click to translate the full sentence. Triple-click to translate all visible subtitles at once. Features:

Click individual subtitle words for instant translation
Double-click to translate the full sentence
Triple-click to translate all visible subtitles at once
Explore sentence translations with clickable words
Click translated words to see reverse translations back to the source language
Right-click subtitles to copy the text or look up a word on Wiktionary
Correctly handles hyphenated words split across subtitle lines
Automatically pauses playback during translation (configurable)
Tooltip closes when playback resumes
Works on YouTube, SVT Play, and svt.se
Supports all languages available through DeepL

Appearance & customization:

Adjustable subtitle font size and vertical position
Customizable highlight color with presets and HSL color picker
Per-site settings overrides — configure each site independently

Advanced options:

Context history — include previous subtitles for more accurate translations
Choice of DeepL translation model (high quality or fast)

Setup: A DeepL API key is required. Get one from deepl.com/your-account/keys, then open the extension popup and enter your API key and preferred languages.

Simon

Published Firefox add-on:

SubTranslate