I Built an AI Tool That Dubs Any YouTube Video Into 50+ Languages

There are millions of great YouTube videos out there. Tutorials, podcasts, documentaries, lectures. But most of them are locked behind a language barrier. I built TubeVoice to fix that. What it does Paste any YouTube URL, pick a target language, and TubeVoice generates a fully dubbed version in minutes. The original background music and ambient sounds stay intact — only the voice changes. Try it free: tubevoice.io How it works Transcription — AI transcribes the original audio (Whisper) Translation — Neural machine translation to your chosen language Voice Synthesis — Natural-sounding TTS generates the dubbed voice Audio Mixing — AI separates vocals from background using source separation (Demucs), then mixes the new voice with the original background audio The result sounds surprisingly natural. The timing is preserved, background music plays through, and the dubbed voice matches the original pacing. Tech Stack Frontend: Next.js + Tailwind CSS (deployed on Vercel) Backend: Python + Cel