YouTube Video Translator

Translate any YouTube video with AI, free

Translate YouTube subtitles into 40 languages while you watch, with dual subtitles, timing sync and optional AI dubbing.

Get on Firefox Get on Microsoft Edge
Works with: YouTube Dailymotion Crunchyroll Vimeo Netflix* + more
✓ HTML5 video players ✓ Local subtitle rules ✓ Optional AI services
Translate Transform Dub Search Filter
VoxSub complete subtitle control dashboard

What you get

More than YouTube’s built-in translation

Translate with AI, see two subtitle lines at once, and control how it all looks and sounds.

VoxSub showing English and Arabic dual subtitles with a 40-language selector
🔀

Dual subtitles

Keep the original line and your translation on screen together to learn or double-check meaning.

🌍

40 languages, instantly

Pick a language from the list and the available subtitles are translated while you watch. No uploads and no links to paste.

🧠

Tell the AI how to translate

Add your own Gemini API key and write your instruction: formal, casual, simplified, or a dialect such as everyday Arabic.

💚

Free to install

VoxSub is free on Firefox and Edge. Google voice dubbing is free; Gemini translation and ElevenLabs voices use your own API key.

VoxSub custom AI instruction box where you describe how to translate

VoxSub translates the subtitles available on the video, or a subtitle file you load.

Why VoxSub

Powerful subtitle tools in one lightweight extension

Everything you need to watch, learn, translate, and control subtitles.

🎯

Dual Captions

Display the original subtitle beside a translated or rewritten version while watching.

🌍

AI Translation

Translate, simplify, rephrase, or rewrite subtitles into supported dialects using your own prompts.

🎙️

Optional AI Voice Dubbing

Generate voice playback from subtitles. Google voices are free; ElevenLabs voices use your own API key.

🛡️

Smart Subtitle Profiles

Create profiles to replace words, skip subtitle segments, or mute selected audio parts while watching.

🔍

Subtitle Search

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

📂

Upload Subtitle Files

Upload your own subtitle files and use translation, search, filtering, editing, and dubbing features normally.

Product Tour

See how VoxSub transforms your YouTube watching experience

Take full control of subtitles, translations, and sound while streaming.

01

Dual Captions & Translation

Display the original subtitle beside a translated or rewritten version while watching YouTube videos.

  • Original subtitle & translated subtitle side-by-side
  • AI translation & custom prompts
  • Support for multiple languages & dialects
VoxSub dual captions on YouTube video player
02

Optional AI Voice Dubbing

Generate voice playback from subtitles. Google voices are free; ElevenLabs voices use your own API key.

  • Listen to YouTube videos in your language
  • Free Google voices or ElevenLabs (your own key)
  • Real-time audio sync & voice tuning
AI dubbing panel inside VoxSub for YouTube
03

Full Subtitle Timing & Sync

Fix out-of-sync subtitles in seconds. Adjust timing with global offset, one-click sync, or drift correction.

  • Instant timing adjustment
  • Global offset & One-click audio sync
  • Two-point drift correction across entire video
Subtitle sync and timing controls
04

Subtitle Search & Jump

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

  • Find any dialogue or tutorial step instantly
  • Click timestamp to jump directly in the video
  • No external subtitle tool required
Search inside YouTube subtitle timeline

Simple Setup

Start watching with better subtitles in 3 steps

⬇️

1. Install VoxSub

Add the extension to your browser and open any video page.

▶️

2. Load subtitles

Use detected subtitles or upload your own subtitle file.

⚙️

3. Translate, search, and filter

Apply AI translation, subtitle profiles, search, dubbing, and visual customization while watching.

Power User Features

Smart Subtitle Profiles & Filtering

Create custom subtitle profiles to replace words, skip subtitle segments, or mute selected audio parts while watching.

Replace Words Skip Segments Mute Audio Import / Export
Privacy friendly: your 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.
Smart subtitle profiles and customization interface

Supported Platforms

Works where you watch

Works on most websites that use HTML5 video players.

*Requires subtitle file upload when subtitles are not directly available.

20
Languages & dialect workflows
7
Core subtitle tools
600
KB lightweight package target

Get VoxSub

Ready to upgrade your subtitles?

Install from Microsoft Edge Add-ons or Firefox Add-ons.

Get on Firefox Get on Microsoft Edge

Want to support development? Visit our support page