Convert between Simplified Chinese and Traditional Chinese online using OpenCC. Supports Taiwan localized phrases (s2twp / tw2sp) and character-only conversion, 100% client-side.
Convert between Simplified Chinese and Traditional Chinese online using OpenCC. Supports Taiwan localized phrases (s2twp / tw2sp) and character-only conversion, 100% client-side. Use it for everyday work, development, learning, or quick verification.
This tool runs in your browser. Before working with sensitive data, make sure you trust your browser and device environment.
Converting between Simplified Chinese (used in Mainland China and Singapore) and Traditional Chinese (used in Taiwan, Hong Kong, and Macau) involves much more than a simple character-by-character lookup. While standard character conversion replaces glyphs directly, regional Mandarin varieties also differ significantly in everyday and technical vocabulary. For instance, Mainland Chinese uses terms like 软件 (software), 信息 (information), 视频 (video), and 默认 (default), whereas Taiwan Traditional Chinese uses 軟體, 資訊, 影片, and 預設.
This tool is powered by OpenCC (Open Chinese Convert), the industry-standard open-source conversion engine for Chinese script and regional lexicon adaptation. By using phrase-level segmentation and curated regional dictionaries, OpenCC supports both pure glyph conversion (s2t / t2s) and full Taiwan phrase localization (s2twp / tw2sp). When you select "Simplified → Traditional (Taiwan Phrases)", the engine converts simplified characters to Taiwan Ministry of Education standard glyphs while seamlessly translating Mainland idioms into natural Taiwan expressions.
One of the biggest linguistic challenges in Chinese conversion is "one-to-many" character mapping (一對多字). During script simplification in the 20th century, multiple distinct Traditional characters were merged into single Simplified forms—for example, 发 can map to 發 (send/develop) or 髮 (hair), and 后 can map to 後 (after/behind) or 后 (queen/empress). Although OpenCC resolves the vast majority of ambiguities through context-aware phrase matching, human proofreading is still recommended for proper nouns, classical poetry, and specialized terminology.
Privacy and Security First: Because the OpenCC dictionary bundle is approximately 1.1 MB, this tool lazy-loads the engine on your first conversion and caches it in memory. Every conversion happens 100% locally inside your web browser. Your confidential documents, localization strings, and personal text never leave your device or touch an external server.
"Characters Only (s2t)" performs character-level conversion to standard Traditional Chinese without altering vocabulary. "Taiwan Phrases (s2twp)" additionally replaces Mainland Chinese terms with authentic Taiwan vocabulary (such as converting 软件 → 軟體, 信息 → 資訊, 鼠标 → 滑鼠, and 文件 → 檔案), making it ideal for localizing apps, websites, and articles for Taiwan audiences.
A single Simplified character often corresponds to two or more Traditional characters with different meanings (e.g., 干 can be 乾 "dry" or 幹 "trunk/do"; 里 can be 裡 "inside" or 里 "neighborhood/mile"). OpenCC uses dictionary segmentation to pick the right character in common words, but ambiguous single characters or rare proper names should be double-checked by a reader.
Clicking the Swap button moves your current converted output into the input box and automatically reverses the active conversion mode—flipping s2twp ⇄ tw2sp or s2t ⇄ t2s—so you can immediately test round-trip conversion or edit in the opposite direction.
No. All dictionary lookups and text transformations run strictly client-side in your browser using JavaScript. Zero network requests are made with your input text, ensuring complete privacy for sensitive documents.
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