# VoxSub > Translate, download, upload, synchronize, search, filter, rewrite, and customize subtitles on HTML5 video players. Canonical page: [https://chrome-stats.com/d/voxsub](https://chrome-stats.com/d/voxsub) ## Overview - **ID:** `voxsub` - **Platform:** Firefox - **Type:** Firefox add-on - **Status:** Available - **Publisher:** voxsub - **Category:** language-support,photos-music-videos - **Daily users:** 13 - **Weekly downloads:** 5 - **Rating:** 5.00 / 5 (1 ratings) - **Version:** 1.7.4 - **Last updated:** 2026-08-23 - **First published:** 2026-05-11 - **Size:** 550 KB - **Data as of:** 2026-09-06 - **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/voxsub/) - **Website:** [https://voxsub.netlify.app/contact](https://voxsub.netlify.app/contact) - **Privacy policy:** [https://addons.mozilla.org/firefox/addon/voxsub/privacy/](https://addons.mozilla.org/firefox/addon/voxsub/privacy/) ## Description 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. ## Rankings - #29,741 — Overall - #184 — upload ## Permissions and access ### Permissions - `activeTab` - `downloads` - `scripting` - `storage` - `webRequest` ### Host permissions - `` ### Content script matches - `` ## Safety - **Risk impact:** High risk impact - **Risk likelihood:** High risk likelihood ### Analysis details - Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site. - This extension was recently updated in the past month. New updates may not be stable or safe. > Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing). ## Similar extensions and apps - [EasySubs](https://chrome-stats.com/d/easysubs) — 189 users, 3.88 / 5 - [SubText](https://chrome-stats.com/d/subtext) — 15 users, 5.00 / 5 - [YouSub](https://chrome-stats.com/d/yousub) — 12 users - [Dual Subtitles & AI Translation - InterSub](https://chrome-stats.com/d/intersub) — 1,441 users, 3.85 / 5 - [AI Subtitle Translator](https://chrome-stats.com/d/ai-subtitle-translator) — 19 users - [Sublern — AI Translate Words in Video Subtitles](https://chrome-stats.com/d/sublern) — 174 users - [Subtitle Translator](https://chrome-stats.com/d/subtitle-translator) — 20 users - [+Sub](https://chrome-stats.com/d/plussub) — 509 users, 4.41 / 5 - [Live Subtitle & Translator](https://chrome-stats.com/d/live-subtitle-translator) — 106 users - [SubTranslate](https://chrome-stats.com/d/subtranslate) — 14 users - [Subtitles Translator](https://chrome-stats.com/d/subtitles-translator) — 36 users, 1.00 / 5 - [Dualsub - YouTube Subtitle Translator](https://chrome-stats.com/d/dualsub) — 4,964 users, 4.25 / 5 --- Source: [Chrome-Stats](https://chrome-stats.com/d/voxsub)