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Kuaiyi Translate — Chinese-focused multi-format AI translation (PDF / video / EPUB / web) with bilingual side-by-side

TranslationFreemiumLLM-drafted

Part of this entry was LLM-drafted and is being polished.

Kuaiyi (literally 'fast translate') is one of the Chinese-sphere AI translation products that emerged in the GPT-3.5 era and survived. It specializes in document-format-preserving translation: drop in a PDF and get back a layout-preserved bilingual PDF (English original on left page / Chinese translation on right page, formulas / tables / images intact). Same flow for EPUB, .docx, .pptx, video subtitle (.srt). For browsing it has a Chrome extension similar to Immersive Translate but focused harder on Chinese as both source and target. Free tier handles light use; paid unlocks larger files + premium models (DeepSeek, Claude, GPT). Best fit: anyone who needs to read or distribute long-form English / Japanese / Korean content in Chinese while preserving layout.

Editor's verdict

Solid choice for layout-preserving document translation into Chinese — PDFs especially. Immersive Translate is better for browser reading (free, unlimited, sponsor-supported); Kuaiyi is better for offline document workflow. For raw quality on novel Chinese, DeepL still wins on European languages but its Chinese has gotten worse since 2023.

Use cases

  • PDF 雙語對照翻譯
  • 影片字幕一鍵翻
  • 網頁沉浸式翻譯
  • EPUB 電子書翻譯
  • Word / PPT 保留版面翻譯

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Last updated: 2026-04-29

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