Paste a YouTube link. Pick your language. Watch with perfectly synced, auto-generated subtitles — on Chrome, iOS, or Android.
No complex setup. No accounts required. Just paste, pick, and play.
Drop any YouTube URL or search for a video directly inside the app
Select from 15+ languages including Korean, Japanese, Chinese, Spanish, and more
Perfectly synced translated subtitles appear over the video in real-time
Every detail is designed around a seamless subtitle experience across all your devices.
AI transcribes and translates any YouTube video's audio into your chosen language automatically.
Korean, English, Japanese, Chinese, Spanish, French, German, and many more supported out of the box.
Watch on mobile with our native video player. Subtitles overlay directly on the video with frame-perfect sync.
Watch your translation job progress through each stage — from downloading to transcribing to completion.
Subtitle overlay directly on YouTube's own player. No app switching needed — it just works in your browser.
Tap "Share" in the YouTube app and select RootblySub. Your link is ready to translate instantly.
15 languages and growing. Watch content from anywhere, understood everywhere.
15 languages supported — with more on the way
Free to start. No credit card required. Guest mode lets you try before signing up.
Overlay subtitles directly on YouTube
Built-in player with subtitle overlay
Share from YouTube, translate, watch