KoguNavi

Japanese Numeral Converter

Convert common Japanese numeric expressions for documents, invoices, vertical writing, and manuscript cleanup.

Conversion tools

What it helps with

  • Prepare Japanese document amounts in kanji numerals
  • Convert old or formal numeric text into Arabic numbers for review
  • Normalize invoice, manuscript, or vertical-writing examples

How to use

  1. Paste numbers or text containing numeric expressions.
  2. Choose the conversion direction.
  3. For Arabic-to-Japanese conversion, choose normal kanji or daiji style.
  4. Review the result and copy it.

Examples

Arabic to Japanese

Input

12,345円

Output

一万二千三百四十五円

Daiji amount

Input

参拾弐万円

Output

320000円

Good to know

  • Very old, ambiguous, or context-dependent number phrasing may need manual review.
  • The first version focuses on integer expressions and common Japanese units.
  • It does not validate legal or financial document correctness.

FAQ

Does this support daiji numerals?
Yes. Common forms such as 壱, 弐, 参, 拾, and 萬 are supported.
Does this validate financial or legal documents?
No. It is a conversion helper. Important documents still need manual review.
Is document text uploaded?
No. Conversion runs in your browser.

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