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VoxSub – AI Subtitle Translator & Subtitle Toolkit for HTML5 Video Players

VoxSub is an all-in-one subtitle toolkit for HTML5 video players. It lets you detect, translate, rewrite, search, filter, synchronize, download, upload, and customize subtitles directly while watching videos.

Whether you're learning a new language, watching international content, improving subtitle quality, or creating your own subtitle experience, VoxSub gives you complete control over subtitles without interrupting playback.

Key Features

Dual Captions

Display two subtitle tracks at the same time, such as the original subtitles alongside a translated or rewritten version.

Perfect for language learning, bilingual viewing, and subtitle comparison.

AI Subtitle Translation & Rewriting

Translate subtitles into supported languages or rewrite them using your preferred AI service.

Simplify text, adjust writing style, change tone, rewrite subtitles into different dialects, or create your own custom translation instructions.

Smart Subtitle Profiles

Create reusable subtitle profiles that automatically replace words, skip subtitle segments, or mute selected audio while watching.

Build separate profiles for anime, movies, family content, kids, language learning, or any personal preference, then switch between them instantly.

All subtitle rules are stored locally in your browser and can be imported or exported at any time.

Subtitle Download & Upload

Download detected subtitles from supported HTML5 video players, regardless of subtitle length.

Upload your own subtitle files to supported websites and use every VoxSub feature, including translation, rewriting, searching, synchronization, filtering, dual captions, and subtitle customization.

Subtitle Search

Search instantly inside detected or uploaded subtitles.

Jump directly to any matching subtitle line or timestamp without manually searching through the video.

Perfect for studying, reviewing conversations, or finding specific scenes in seconds.

Subtitle Synchronization

Quickly synchronize subtitle timing with the video by selecting the spoken word or subtitle line.

An easy way to fix subtitle delays without manually editing subtitle files.

Subtitle Customization

Customize subtitle appearance and playback behavior from a simple control panel.

Adjust subtitle display, filtering, search tools, playback options, and subtitle-related settings without leaving the video.

Automatic Subtitle Detection

VoxSub automatically detects subtitles available on supported HTML5 video players.

If subtitles are unavailable, simply upload your own subtitle file and continue using all subtitle tools without limitations.

Optional AI Voice Dubbing

Generate AI voice playback from subtitles using supported AI voice services with your own API key.

Lightweight & Fast

Designed to stay lightweight, responsive, and efficient while watching videos.

Privacy Friendly

VoxSub does not collect personal data.

Subtitle profiles, settings, and rules are stored locally in your browser.

AI features run only when you choose to use them and may require your own API key depending on the selected AI service.

Why Choose VoxSub?

• Translate subtitles with AI.
• Display dual subtitles.
• Rewrite subtitles using custom AI instructions.
• Download subtitles from supported websites.
• Upload your own subtitle files.
• Synchronize subtitle timing.
• Search subtitle text instantly.
• Create reusable subtitle profiles.
• Replace words, skip subtitle lines, or mute selected audio.
• Lightweight, fast, privacy-friendly, and easy to use.