DualTrans: AI Bilingual Translator for Web Pages & YouTube Subtitles

Free side-by-side translation for any web page and YouTube. Select to translate, look up words, and use AI or your own API key.

Read any foreign-language page with the original and the translation right next to each other — so you understand the meaning without losing the author's exact words. DualTrans is a free AI translator for web pages, YouTube subtitles and selected text. It keeps the page layout intact and puts each translated paragraph directly under its source, which makes it ideal for reading news, research papers, technical docs and forums, or for learning a new language. ━━━━━━━━━━━━━━━━━━━━ ✨ WHAT YOU CAN DO ━━━━━━━━━━━━━━━━━━━━ 📖 Bilingual web page translation • Translate a whole page in one click from the toolbar, the floating button or the right-click menu. • Show translation below the original, or translation only — switch any time. • Pick a style that suits your eyes: plain, underline, highlighter, divider, quote block and more. • Only visible paragraphs are translated as you scroll, so long pages stay fast. • Pages already in your language are skipped automatically. 🎬 YouTube dual subtitles • Watch with two subtitle lines at once: the original and your language. • Subtitle size adapts to the player, and one button in the player turns dual subtitles on or off. 🖱️ Select to translate & word lookup • Highlight any word or sentence to see the translation instantly. • Single words show dictionary entries, part of speech and pronunciation. 🤖 Choose your engine — or bring your own AI • Several free translation engines are built in, including Chrome's on-device translator — no account needed. • Bring Your Own Key: add an API key from the AI provider you trust, or connect any OpenAI-compatible endpoint, including local models. • Automatic fallback: if one engine is rate-limited or down, DualTrans switches to another so your reading isn't interrupted. 🌍 32 interface languages and 100 translation languages. ━━━━━━━━━━━━━━━━━━━━ 🔒 PRIVACY FIRST ━━━━━━━━━━━━━━━━━━━━ • No ads, no tracking of the pages you read. • Your API keys and settings are stored locally in your browser. • Text is sent only to the translation engine you choose. ━━━━━━━━━━━━━━━━━━━━ ❓ FAQ ━━━━━━━━━━━━━━━━━━━━ Is DualTrans free? Yes. Web page translation, YouTube dual subtitles and selection translation are free with the built-in engines. You can also connect your own AI API key at no extra cost from us. Which sites does it work on? Any regular web page — news, blogs, documentation, forums and video sites. How do I start? Pin DualTrans to the toolbar, open a foreign-language page and click the icon — or press the floating button on the page. Questions or feedback: support@productcool.com · https://dual.productcool.com