Tonglens — Bilingual Web Translator

Keep original text visible with inline translations. Customize providers, sync saved rules, and send feedback.

Keep the original text in view while reading a translation beside it. Tonglens works on web pages and includes configurable translation providers, personal translation-position rules and Chrome Sync. Install and start 1. Install Tonglens from the Chrome Web Store: https://chromewebstore.google.com/detail/nglkdndphmcfbdoikddencgcmcfgijaf 2. Open a clearly English page. Automatic translation uses Simplified Chinese as the default target. To use another target, open Settings and change the language code (zh-CN, zh-TW, ja, en, etc.). 3. Other or mixed-language pages require manual translation. Open the floating 通 button and choose 立即翻译此页 (Translate this page) or 强制翻译此页 (Force translation). Built-in rules handle English Amazon product titles separately. 4. Choose 标记需翻译位置 (Mark a position to translate), select an element and confirm to save a personal site rule. Reload other open pages after the rule has synced. Providers and reliability The default third-party Google channel needs no user API key. Its availability and limits are controlled by the provider. Optional OpenAI-compatible providers use your own endpoint, model and API key. Remote endpoints require HTTPS; local loopback services may use HTTP. Version 0.1.4 adds a 12-second limit per Google request and at most one retry for temporary failures. Failed text is recorded as a failure, not an empty translation; successful items in the same batch remain available. The popup shows failure counts. Retry manually after connectivity recovers. No Microsoft fallback is included. Sync and privacy The same Chrome Sync account and extension ID can share non-sensitive settings, site blocklists and saved hostname/selector rules. API keys and translation caches remain on each device. Sync is asynchronous and open pages may need a reload. Translation text is sent directly to the selected provider; the developer does not receive it. Privacy policy: https://tonglens-privacy.pages.dev/ Scope and limitations This extension translates web-page text, not PDF files, video subtitles or EPUB books. Automatic translation is limited to clearly English pages; manual translation is available for other pages. The main settings screens currently use Chinese labels. The feedback page and quick-start guide support English and Simplified Chinese, with automatic language selection and a manual switch. Support and feature requests Open Help & feedback / 反馈 from the popup or settings, use the English feedback page https://tonglens-privacy.pages.dev/support/tonglens/?lang=en, or email 1793master@gmail.com. Include the extension version, website, reproduction steps and expected result. Review and send the email yourself. Hide personal information in screenshots. We evaluate requests by impact and feasibility; submission does not promise a release date.