Mandarin Lens - AI Chinese YouTube Voiceover

Mandarin Lens turns any YouTube video into a Mandarin Chinese listening lesson — no textbooks, no flashcards, just the content you already enjoy. Activate on any YouTube video with captions. Within seconds, an AI-generated Mandarin voiceover plays over the video while tone-colored pinyin subtitles appear on screen. The original audio ducks to a low level in the background — like a live news interpreter — so you still hear the speaker's tone and rhythm while listening to natural Mandarin Chinese. RECENT UPDATES (v0.2.6) • New natural-sounding Mandarin voices (Mei, Lin, Wei, Jun), switchable mid-video. • Added a User Guide button to replay the walkthrough, plus Report Issues and Rate links. FEATURES • AI Mandarin voiceover — hear every sentence spoken aloud in natural Mandarin, synced to the video • Tone-colored pinyin — each syllable is color-coded by tone (red, orange, green, blue) so you learn Chinese tones passively • Full transcript panel — the complete Chinese translation appears beside the video with timestamps; click any line to jump to that moment • Instant dictionary — click any Chinese word for its pinyin, definition, and audio pronunciation • Karaoke highlighting — Chinese characters light up in sync with the audio so you always know where you are • Tap to replay — click the subtitle overlay to replay the last phrase • Adjustable audio — control Mandarin volume and original audio independently HOW IT WORKS Visit any YouTube video with captions (CC) Click the Mandarin Lens icon and sign in with Google Click Activate — AI generates the Mandarin voiceover in seconds Watch in Chinese with tone-colored pinyin subtitles and a full transcript panel WHO IT'S FOR Designed for beginner and intermediate Chinese learners who want more listening input without sitting through structured lessons. Watch cooking, travel, interviews, documentaries — whatever you already enjoy — and absorb Mandarin naturally in context. If you watch YouTube, you can start building Chinese comprehension in the time you were going to spend anyway. PRIVACY • Does not collect personal information beyond Google authentication • Does not store your viewing history or track activity • Does not share data with third parties • Audio is your own AI-generated content — we never access or store YouTube audio REQUIREMENTS • Works on YouTube videos with captions (CC) available • Free Google account required