Youtube Translate Speak

Video Translate & Speak — Watch Any Video in Your Language

Translate subtitles into 90+ languages — right on the video player. No copy-pasting, no switching tabs, no interruptions.

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✦ SUPPORTED PLATFORMS
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🎬 YouTube 🎤 TED
📚 Udemy 🎓 Coursera

More platforms coming soon...

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✦ WHAT IT DOES
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🌍 Instant Caption Translation
Pick your language, hit translate, and watch subtitles appear in real time as the video plays. Supports 90+ languages out of the box.

🔤 Side-by-Side Bilingual View
See both the original and translated text at the same time — ideal for picking up new vocabulary or following along in two languages.

🔊 Read Aloud
Have the translated text spoken to you using your browser's built-in voices or Google Cloud TTS (Chirp3-HD) for natural, human-like speech.

🎙️ No Captions? No Problem.
Some videos simply don't have subtitles. With Soniox speech recognition, the extension listens to the tab audio and generates captions from scratch — in real time.

🎨 Make It Yours
Customize everything: font, text size, colors, background opacity, and text stroke. Your subtitles, your style.

📥 Download as SRT
Export both original and translated captions as SRT files (zipped together). Great for video editing, studying, or offline use.

✨ AI Video Summary (YouTube)
Hit the Summarize button and get a structured summary of the entire video — overview, key points, takeaways, and details — powered by OpenAI. Pick your language and the summary is written in it. No need to watch the whole thing to know what it covers. Copy as Markdown or download as a .md file.

⚡ Set It and Forget It
Translations are cached locally per video. Come back anytime — no need to re-translate.

🖱️ Draggable Panels
Move the control panel and subtitle list anywhere on screen. Works perfectly across all supported sites.

🔄 Smooth Navigation
Built to handle single-page app behavior. Switch between videos on YouTube, TED, Udemy playlists — everything keeps working.

📜 Toggleable Side Panel
Close the subtitle list anytime without losing it — hit the 📜 button to bring it back.

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✦ GETTING STARTED
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1. Go to any video on a supported platform
2. The control panel appears automatically on the player
3. Choose your language → press ▶ Translate
4. That's it — bilingual subtitles appear instantly

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✦ FREE vs. PREMIUM FEATURES
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Everything below works right after installation — zero setup:

✅ Caption translation (Google Translate, free)
✅ Bilingual overlay on the player
✅ YouTube, TED, Udemy, Coursera supported
✅ Voice readout via browser TTS
✅ Style customization
✅ SRT export
✅ Local caching
✅ Quick action buttons (Translate & Summarize) on YouTube

Want even better quality? You can optionally bring your own API keys:

🔑 Google Cloud Translation — more accurate and stable for long sessions or technical content
🔑 OpenAI API — context-aware AI translation with customizable prompts + AI video summary
🔑 Google Cloud TTS (Chirp3-HD) — natural, human-like voices that sound far better than default browser speech
🔑 Soniox STT — the only way to get captions on videos that have none at all

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✦ FAQ
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❓ Do I need an API key?
Nope. Install it and go. The free Google Translate engine handles translation, and your browser's voices handle speech. Nothing else required.

❓ Then what are API keys for?
They're optional upgrades:
• Google Cloud Translation → better accuracy, especially for nuanced or technical language
• Google Cloud TTS → premium Chirp3-HD voices that sound remarkably natural
• Soniox → generates live captions from audio when a video has no existing subtitles

❓ Will API keys cost me money?
Each service offers a generous free tier. Google Cloud gives you 500,000 translated characters per month at no charge. You'd only pay if you go beyond those limits.

❓ Is my API key secure?
Absolutely. Keys stay in your browser's local storage and are sent only to the official service endpoints (Google Cloud, Soniox). They never pass through any third-party server.

❓ What if a video has no subtitles at all?
You'll need a Soniox API key for that. The extension captures the tab's audio stream and converts speech to text on the fly.

❓ Is this useful for language learning?
Very much so. The bilingual display lets you compare original and translated text line by line. Pair that with voice readout for pronunciation, and you've got a solid immersion tool using real-world content.

❓ How does the AI Summary work?
On YouTube, click the ✨ Summarize button on the right side. The extension grabs the video transcript and sends it to OpenAI, which returns a structured summary with overview, key points, takeaways, and details — written in your chosen language. Requires an OpenAI API key.

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✦ WHY THESE PERMISSIONS?
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• Site access (YouTube, TED, Udemy, Coursera) — to read captions and render the overlay on the player
• Tab audio capture — only used when Soniox STT is active, to generate captions from audio
• Storage — to keep your preferences, cached translations, and API keys locally

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💬 Questions, bugs, or ideas? Drop a review or reach out via the support page — every bit of feedback helps shape future updates.