Why do Chinese invoices and cheques require the formal (大写) form?

It's the law. The PRC Accounting Law and the Ministry of Finance《会计基础工作规范》 mandate formal capital numerals (壹贰叁肆伍陆柒捌玖拾佰仟万亿) on every accounting document — invoices, vouchers, cheques, contracts. Reason - the simple form (一二三十百千) is trivially altered (一 becomes 十 with one pen stroke, 三 becomes 五). The capital form is dense and visually distinct, so post-hoc fraud is much harder. Skip the 大写 form and your invoice gets rejected.

What's the difference between simplified (贰) and traditional (貳) capital numbers?

They're the same number system, different character glyphs. Mainland China uses simplified - 贰叁陆亿. Hong Kong, Taiwan, and Macau use traditional - 貳參陸億. Both follow the identical 零壹贰叁肆伍陆柒捌玖 / 拾佰仟万亿 structure, but on a Hong Kong cheque you'd write 壹萬圓整, on a mainland one 壹万元整. We give you both modes — pick by jurisdiction.

How do I write 0.5 yuan in formal Chinese?

零元伍角整. Three rules at work — (1) integer zero is written as 零元 (not omitted); (2) decimal 0.5 means 5 角 (one tenth of a yuan); (3) since 分 (one hundredth) is zero and 角 is the last non-zero unit, append 整. If it were 0.55 — 零元伍角伍分 (no 整, because 分 is non-zero).

Why is "整" appended to whole amounts?

整 means "exactly / nothing more" and seals the amount against fraud. If you write 壹仟元 (one thousand yuan) without 整, a forger can append 伍角 (50 cents) or even 零伍角伍分. Adding 整 declares "stops here, no decimals". Rule - append 整 whenever 角 and 分 are both zero (or amount is a clean integer). When 角 or 分 has value, omit 整.

What's the maximum number this supports?

Up to 京 (10^16). The Chinese big-unit system goes 万 (10^4) → 亿 (10^8) → 兆 (10^12) → 京 (10^16) → 垓 (10^20). We cap at 京 because beyond that the units are essentially academic — no real invoice, contract, or bank document uses them. JavaScript's Number is safe to ~9 × 10^15, so 京 is the practical ceiling. For higher precision use the BigInt-friendly version (planned).

Chinese Numeric Converter — Arabic ↔ Simple / Formal Capital / Amount (元角分)

Arabic ⇄ Chinese number — simple (一二三), formal (壹貳參), or amount (金额大写 with 元角分).

Runs locally
Category Format Converter
Best for Turning pasted content or local files into a handoff-friendly format.

Direction

Output mode

Input

Quick samples

Result

壹仟贰佰叁拾肆点伍陆

What this tool does

Convert Arabic numerals to Chinese numbers — and back — in your browser. Four modes cover every real-world use case: simple Chinese (一千二百三十四) for reading and informal writing; formal simplified capitals (壹仟贰佰叁拾肆) used on every mainland Chinese invoice, bank cheque, and tax receipt under the《会计基础工作规范》; formal traditional (壹仟貳佰參拾肆) used in Hong Kong, Taiwan and Macau; and reverse parsing — paste any Chinese number back to its Arabic form. Amount mode (金额大写) follows the official MoF rule set: "整" suffix on whole amounts, single "零" for internal gaps, proper 元 / 角 / 分 placement, and no-ambiguity formatting (no "零零", no "重大"). Supports decimals, negatives, and integers up to 京 (10^16). Bundle 14 KB, 100% client-side, no upload.

Tool details

Input: Files + Numbers; The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output: Live result + Copy; The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy: Browser-side processing; The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share: No account required; Open the page and use it; whether results survive refresh depends on the tool.
Performance budget: Initial JS <= 14 KB; No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit: Format Converter · Finance; Category and role tags drive related tools, internal links, and quick fit checks.

How to use

1. Input

Paste or drop your content into the tool panel.
2. Process

Click the button. All processing is local in your browser.
3. Copy / Download

Copy the result or download to disk in one click.

How Chinese Numeric Converter fits into your work

Use it when the main problem is getting content from one practical format into another.

Conversion jobs

Turning pasted content or local files into a handoff-friendly format.
Previewing a conversion before you use it in a larger workflow.
Cleaning small format mismatches without opening a full editor.

Conversion checks

Try a small sample first when the source format is messy.
Check character encoding, separators, and line endings after conversion.
Keep the source until the converted output has been reviewed.

Good next steps

These links move the current task into a more complete workflow.

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Chinese Numeric Converter — Arabic ↔ Simple / Formal Capital / Amount (元角分)

What this tool does

Tool details

How to use

1. Input

2. Process

3. Copy / Download

How Chinese Numeric Converter fits into your work

Conversion jobs

Conversion checks

Good next steps

FAQ

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