Guides JP

Number to Kanji Converter

Convert between Arabic numerals and Japanese kanji numerals. Shows standard kanji, financial daiji (壱弐参拾), comma-separated numbers, and amount notation at once.

Last updated: 2026/10/16 Text Feedback & bug reports
Quick input:
Arabic numeral (comma separated)
Enter a number or kanji numeral and the converted results will appear here.
Kanji numeral (standard)
Enter a number or kanji numeral and the converted results will appear here.
Daiji (formal / financial)
Enter a number or kanji numeral and the converted results will appear here.
Amount notation (daiji)
Enter a number or kanji numeral and the converted results will appear here.

How to Use

1

Enter a number or kanji

Type an Arabic numeral (e.g. 12345) or a kanji numeral (e.g. 一万二千三百四十五). The conversion direction is detected automatically.

2

Check the results

Standard kanji, financial daiji, comma-separated Arabic numerals, and amount notation are generated in real time.

3

Copy with one click

Press the copy button on any result to copy that notation to your clipboard, ready to paste into invoices or contracts.

About the Number to Kanji Converter

A web tool to convert between Arabic numerals (0-9) and Japanese kanji numerals (一二三 … 十百千万億兆). It also supports daiji (壱弐参拾), the tamper-resistant numerals used in contracts, invoices and receipts. All processing happens in your browser, so your numbers are never sent to a server.

Features

  • Real-time two-way conversionConverts as you type and auto-detects whether you entered a number or kanji.
  • Daiji supportOutputs formal numerals like 壱, 弐, 参, 拾 used to prevent tampering in documents.
  • Amount & comma formatGenerates amount notation such as 金壱万円也 and 3-digit comma separation at once.
  • Privacy protectedAll processing happens in your browser. Your numbers are never sent to a server.

Use Cases

  • Write amounts on invoices and receipts using daiji (壱弐参拾)
  • Tamper-resistant kanji notation for contracts and checks
  • Kanji numerals for vertical writing or design
  • Read kanji numerals in old documents into Arabic numerals
  • Verify the digits of large numbers (万 / 億 / 兆)

FAQ

What is daiji?
Daiji are complex-form kanji numerals such as 壱, 弐, 参, 拾 used instead of 一, 二, 三, 十. Their intricate shapes prevent amounts from being altered, so they appear on contracts, invoices and checks.
Should I enter a number or kanji?
Either works. Enter an Arabic numeral to get kanji and daiji, or enter kanji to get the Arabic numeral. The direction is detected automatically from your input.
How large a number can it convert?
It supports up to 万, 億, 兆, 京 and 垓, so even large integers with dozens of digits convert accurately without overflow errors.
Can it read both 一万二千 and 二〇二四 style?
Yes. It converts both positional notation using place units (一万二千) and digit-by-digit notation (二〇二四) into Arabic numerals.
Are my numbers sent to a server?
No. All conversion happens inside your browser, and your input is never sent to or stored on any server.

Related Tools

Character Counter Count characters, words, and lines in real-time Fullwidth/Halfwidth Converter Convert between halfwidth and fullwidth characters Text Replace Tool Find and replace text with regex support Text Diff Checker Compare two texts and highlight differences Mojibake Fixer Auto-detect and fix garbled text encoding

Popular Tools

JSON Formatter Format and validate JSON with syntax highlighting QR Code Generator Create custom QR codes with logo, colors & styles Password Generator Generate secure random passwords with one click Base64 Encoder Encode and decode text or files to Base64 IP Address Checker Check your global IP address Percent Calculator Calculate percentages easily