MP4Loader

Download any video, auto-generate subtitles in 15 languages, and dub it with AI voices — all running as your own private server on your own network.

Download (Windows)

✨ Features ⚙️ How It Works

Why MP4Loader?

🌐

Grab video or audio from YouTube and other sites, or import a file you already have. MP4 or MP3, up to full quality, your choice.

📝

Local speech recognition transcribes the audio, then translates it into any of 15 languages — with automatic source-language detection.

🎙

Full voice-over translation with natural neural voices, male or female. Timing is automatically matched to the original speech.

🔒

Speech recognition and translation run entirely on your own machine — no video or text is uploaded anywhere for those steps.

🖥️

Runs as a lightweight local web server. Start a download from your phone, laptop, or any device on the same network.

⚡

Recognition and translation results are saved. Re-run a dub in another voice or regenerate subtitles in seconds, not from scratch.

Behind every subtitle and every dubbed voice is the same simple pipeline:

✅ History with Progress: Every job shows a live progress bar and can be cancelled at any time.
✅ Retry-Friendly: A failed or interrupted job never forces you to start over from zero.
✅ Format Flexible: Save just the audio as MP3, or keep the full MP4 video.
✅ Language Presets: Set your default source and target languages once in Settings.

Speech Recognition

Local AI transcribes the original audio, auto-detecting the language if needed.

↓

Translation

The transcript is translated into your chosen target language.

↓ then choose:

→A

Subtitles (.srt)

Timed subtitle file, ready to open with the video or burn in.

→B

AI Dubbing

Neural text-to-speech voices the translation, synced to the original timing.