Media
3 items
Description
Fast bilingual subtitles for YouTube videos, with automatic target-track and translation fallback. ToneSub adds fast bilingual subtitles to YouTube videos. It displays the original captions alongside a target-language translation, automatically preferring YouTube’s available target-language caption track and using a translation fallback when needed. Customize subtitle order, position, font, size, colors, background, and outline to match your viewing style. Optional DeepSeek BYOK AI enhancement is off by default. It only activates after you provide your own API key, confirm the in-extension data disclosure, and grant the optional permission. ToneSub works only on YouTube video pages. It has no ads, no account system, and no developer-operated backend.