YouTube Bilibili AI subtitles for Global Video & Shorts

Millions of creator uploads, VTuber archives, tech reviews, lectures, and vertical clips go live every day without captions—or with auto-captions locked to a single language. MiraiSub provides youtube bilibili ai subtitles alongside Douyin and TikTok support directly over the web player.

When native captions fall short: youtube bilibili ai subtitles

YouTube disables automatic captions on countless foreign-language uploads, music-backed vlogs, and niche creator channels, while YouTube's built-in machine translate frequently splits sentences mid-phrase on Japanese, Mandarin, Korean, or Russian speech. On Bilibili (bilibili.com), rich tech deep-dives, anime commentary, and game guides rarely include English, Vietnamese, Spanish, or Indonesian tracks—especially for unlogged international visitors.

Short-form feeds on YouTube Shorts, Douyin, and TikTok move even faster: creators upload raw spoken clips or bake Mandarin/Japanese text into vertical 9:16 frames with zero multilingual caption tracks. MiraiSub listens directly to the browser's HTML5 media element and overlays context-aware translations in over 60 target languages.

Seamless SPA navigation from long-form videos to vertical Shorts

Modern video platforms are single-page web applications where clicking a recommended video or swiping down a Shorts/TikTok feed reuses or swaps HTML5 video elements dynamically without reloading the browser tab. Generic subtitle scripts often get stuck showing lines from the previous clip.

MiraiSub includes dedicated adapters for desktop YouTube, mobile m.youtube.com, YouTube Shorts, Bilibiliwatch/bangumi routes, Douyin, and TikTok. Whenever the video ID changes, the extension detaches the previous track immediately, anchors a single clean badge to the active viewport player, and scales line width for 16:9 horizontal or 9:16 vertical layouts.

  • Supports youtube.com, m.youtube.com, YouTube Shorts, bilibili.com (BV & bangumi), douyin.com, and tiktok.com.
  • Automatically pauses ad-clip attachment during skippable pre-rolls so ads never consume quota.
  • Adapts typography margins on vertical Shorts and Reels so subtitles never collide with right-side like/share buttons.

Contextual LLM translation vs word-by-word auto-captions

Traditional rolling auto-captions emit two or three words at a time without knowing how the speaker finishes the sentence—a major headache in Japanese, Korean, German, or Turkish where verbs appear at the end. MiraiSub groups natural speech utterances and translates complete thoughts with large language models so technical terms, gaming slang, and conversational tone read naturally.

When you scrub ahead to chapter 4 of a 90-minute Bilibili documentary or YouTube lecture, playhead scheduling shifts immediately to your current timestamp instead of processing from minute zero.

Mobile m.youtube.com and Bilibili on Android Kiwi & iOS Orion

On phones, opening m.youtube.com, Bilibili, or TikTok web inside Kiwi Browser (Android) or Orion Browser (iOS) gives you full MiraiSub subtitle overlays—including portrait fullscreen for vertical Shorts and landscape fullscreen for widescreen videos, with touch-friendly 44px controls.

Note that browser extensions run inside web browsers rather than closed native iOS/Android store apps, so bookmarking m.youtube.com or bilibili.com in Kiwi or Orion gives the smoothest one-tap mobile experience.

Frequently asked questions

Does MiraiSub work on Bilibili without uploading or downloading the video?

Yes. Open any Bilibili BV video or bangumi episode in your browser, press play, and click the MiraiSub badge on the player to stream translated subtitles directly over the video.

Does it follow swipes on YouTube Shorts, Douyin, and TikTok?

Yes. As you scroll or swipe to the next vertical clip on YouTube Shorts, Douyin, or TikTok web, the overlay re-attaches to the newly playing video and loads a fresh key.

How is this better than YouTube's built-in auto-translate?

MiraiSub works even when a creator has no captions at all, groups full sentences instead of choppy rolling fragments, and translates idioms accurately across 60+ languages.

Can I watch m.youtube.com with AI subtitles on Android?

Yes. Install MiraiSub in Kiwi Browser on Android, open m.youtube.com (both regular watch pages and Shorts), and enjoy full portrait and landscape fullscreen subtitle rendering.

Will YouTube pre-roll ads waste my subtitle minutes?

No. Ad-state detection suppresses subtitle generation while pre-roll or mid-roll ads are playing and attaches only to the main video.

Subtitles are generated by AI and can contain mistakes. We do not host or link to videos.