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VoxSub – AI Subtitle Translator & Dual Captions

VoxSub is a lightweight subtitle extension for HTML5 video players. It helps you translate, customize, search, filter, and display subtitles directly while watching videos.

With VoxSub, you can view dual captions, translate subtitles using supported AI services, rewrite subtitles in different tones or dialects, search inside subtitle text, upload your own subtitle files, and create smart subtitle profiles for better control over your viewing experience.

Key Features

Dual Captions
Display two subtitle tracks at the same time, such as the original subtitle and a translated or rewritten version.

AI Subtitle Translation & Rewriting
Translate subtitles, simplify text, adjust tone, or rewrite subtitles into supported dialects using your own instructions.

Smart Subtitle Profiles
Create custom subtitle profiles to replace words, skip subtitle segments, or mute selected audio parts while watching. Build separate profiles for anime, movies, family content, kids, or language learning, and apply them instantly.

Rules are stored locally in your browser and can be imported or exported anytime.

Subtitle Search
Search for words or phrases inside detected or uploaded subtitles and jump directly to the matching timestamp.

Subtitle Customization
Adjust subtitle appearance and playback options from a simple control panel, including subtitle display, audio-related tools, and quick access to search and filtering features.

Automatic Subtitle Detection & Upload
VoxSub can detect available subtitles on supported HTML5 video players. If subtitles are not available, you can upload your own subtitle files and use translation, search, editing, filtering, and dubbing features normally.

Optional AI Voice Dubbing
Generate voice playback from subtitles through supported AI voice services when configured with your own API key.

Lightweight & Fast
Built to stay compact, responsive, and efficient while watching videos.

Privacy Friendly
VoxSub does not collect personal data. Subtitle rules are stored locally in your browser. AI features run only when triggered and may require user-provided API access depending on the selected service.