Chinese Formal Numeral (大写) Converter [Free] — CNY/TWD/HKD

What are Chinese Formal Numerals (大写)?

In China, Taiwan, and Hong Kong, financial documents such as invoices (发票), receipts, contracts, and bank forms are required to use formal Chinese numerals (大写 / dàxiě) instead of standard numerals or simplified characters. These complex characters — such as 壹 (1), 贰 (2), 叁 (3) — are deliberately harder to alter, preventing tampering with monetary amounts.

This practice is similar to writing "Amount in Words" in English-speaking countries, but is legally mandated in mainland China for official financial documents. The People's Bank of China and tax authorities require 大写 notation on invoices, checks, and payment orders.

If you are issuing invoices or contracts for Chinese, Taiwanese, or Hong Kong clients, this tool helps you convert any amount into the correct 大写 format with the appropriate currency units (元/圓, 角/毫, 分/仙).