DualView Translator - 原文併記翻訳 by hirokatsu hibino

Tired of translation tools that swallow the original text? DualView Translator keeps it right there — the translation slides in right under the original, so you never lose the context.

Great for language learners, anyone reading foreign articles, or when you just want to double-check what a translator gave you.

■ What you get

• Dual-view display — the translation appears right under the original, no jumping back and forth
• 8 translation modes — pick what fits: a single line, the whole page, just one element, with or without AI summary
• Auto-translation rules — set up your favorite sites once, and they get translated automatically when you open them
• Translation reset — undo per element with the × button, or wipe everything in one tap
• Two engines — Google Translate (free, no setup) or DeepL (sharper translations)
• AI summaries — Claude or Gemini sums up the translated content in 3–5 lines
• Tabbed popup — translation actions and settings, neatly separated
• Keyboard shortcuts — Ctrl+Shift+T, you know the drill
• 11 UI languages — Japanese, English, Chinese (Simplified/Traditional), Korean, French, German, Spanish, Portuguese, Russian, Arabic
• Dark / Light theme — follows your OS, no fuss

■ The 8 translation modes

1. Selection translation — highlight text, the panel pops up
2. Full-page translation — translate the whole page in dual view
3. Full-page + AI summary — translation plus a quick overview
4. Element selection translation — click the element you care about
5. Element selection + AI summary — same, but with a summary
6. Right-click translation — select text, right-click, done
7. Element translation (right-click) — right-click on a block to translate it
8. Element translation + AI summary — same, with a summary

■ The translation bar

Open a foreign-language page and a small bar pops up at the top. One click to "Translate", one click to "Translate & Summarize". That's it.

■ Auto-translation rules

Got a site you read in another language every day? Register it once with a URL pattern, narrow down to the part you care about with a CSS selector (or just click the element to generate one), and you're set. Works with SPAs, dynamic content, even webmail.

■ Dynamic content

Lazy-loaded sections, infinite scroll — they get picked up and translated as they appear. No need to keep clicking "translate" again.

■ Translation engines

• Google Translate: free, no API key, ready to roll (default)
• DeepL: better quality. Free tier covers 500,000 characters/month

■ AI summaries

Hook up Claude (Anthropic) or Gemini (Google) and get a quick 3–5 line summary of the page you just translated. API key needed for these.

■ Privacy, plain and simple

• Your text only goes to the translation engine you picked
• API keys live in your browser's local storage, nowhere else
• No history collection, no tracking, no data goes to us

■ Keyboard shortcuts

• Ctrl+Shift+T → toggle full-page translation
• Ctrl+Shift+Y → translate selected text
• Ctrl+Shift+R → enter element selection mode