Shinkansen - Blazing fast web & YouTube translator

Recent updates:

• Added multi-language translation + multi-language UI: Traditional Chinese / Simplified Chinese / English / Japanese / Korean / Spanish / French / German
• Added Instant Translation — press translate and see the page start turning into Chinese within 1 second (Gemini only)
• Added Bilingual Mode — original and translation displayed side by side
• Added Custom AI Models — connect to OpenRouter / Claude / DeepSeek / local Ollama, and any other model
• Added AI Subtitle Re-segmentation — YouTube auto-generated subtitles are re-segmented by AI for more natural, readable Chinese
• Added Blocked-word list — list of words you don't want in the translation.
• Added Translate Article Opening Only — translate just the first N paragraphs as a preview to save tokens

Features:

• Privacy first — connects directly to Google; no third-party servers in between
• Open source — code is publicly available on GitHub for anyone to audit
• Multi-language translation + multi-language UI — Traditional Chinese / Simplified Chinese / English / Japanese / Korean / Spanish / French / German

Web page translation • Instant Translation: press translate and see the page start turning into Chinese in 1 second — no waiting for the full API batch to return (Gemini only) • Translated segments are automatically cached; re-translating costs nothing next time • Two display modes: "Monolingual Overlay" replaces text in place, "Bilingual" shows original and translation side by side • Edit translations: after translation completes, edit the rendered text directly on the page to fix any awkward translations before exporting to PDF

YouTube subtitle translation • Real-time translation of YouTube subtitles into Traditional Chinese, matching native YouTube subtitle styling • AI-powered re-segmentation: auto-generated (ASR) subtitles are re-segmented by AI based on meaning, turning fragmented snippets into readable sentences • Bilingual subtitles: English + Chinese on two lines simultaneously — great for listening practice

Three translation hotkeys / three engines • Alt+A / Alt+S / Alt+D each map to a preset translation engine • Gemini AI (best quality, API key required) • Google Translate (free machine translation, no API key needed, even faster) • Custom AI Models (OpenAI-compatible — connect to OpenRouter / Claude / DeepSeek / Groq / local Ollama, hundreds of models)

Translation quality controls • Fixed glossary: force specific terms to always be translated to your chosen rendering (global + per-domain layers) • Customizable blocked-word list: an editable list of words you don't want in the translation. write your own substitution pairs. • Document-wide glossary consistency: names and proper nouns translated consistently throughout long articles • Translate opening only: translate the first few paragraphs as a preview before deciding whether to read the rest — major token savings Auto-translate and cross-page continuation • Auto-translate specified sites: add a domain, and pages on that domain are translated on entry • Cross-tab continuation: when you click a link from a translated page to open a new tab, the new tab is auto-translated and inherits the same preset

Usage tracking and cost-saving reports • Logs token count, cost, and cache hit rate for every translation, with charts and CSV export • Two-layer cache (local cache + Gemini implicit context cache); cache hit rate and actual savings are shown in real time after each translation completes