Japanese Input Method

By Xah Lee. Date: . Last updated: .

Here's a introduction to Japanese Writing System and Japanese Input Method.

mac japan input 2019-12-21 rfjrq
MacOS Japanese Input preference 2019-12-21

Japanese Writing System

Japanese writing uses the following characters:

Of the kana, there are 2 types:

There are total of 48 hiragana in modern Japanese. Same total for katakana.

Japanese kana: hiragana and katakana
kstnhmyrw
a
a
ka sa ta na ha ma ya ra wa
i i ki si ti ni hi mi ri wi
u u ku su tu nu hu mu yu ru
e e ke se te ne he me re we
o o ko so to no ho mo yo ro wo
n
n

The Dakuten Diacritic Mark

Dakuten is a diacritic mark that often occurs for many hiragana.

When it appears on a hiragana, it means that the consonant of the syllable should be voiced.

Character Frequency in Japanese

In formal writing, such as newspaper or books, about half are kanji, and other half are hiragana.

Japanese Character frequency
Characters%
Kanji41.38
Hiragana36.62
Katakana6.38
Punctuation and symbols13.09
Digits2.07
English letters0.46

Source, Japanese newspaper Asahi Shimbun from the year 1993 (around 56.6 million tokens). [Chikamatsu, Nobuko; Yokoyama, Shoichi; Nozaki, Hironari; Long, Eric; Fukuda, Sachio (2000). A Japanese logographic character frequency list for cognitive science research. Behavior Research Methods, Instruments, & Computers. 32 (3): 482–500.] via Wikipedia Japanese writing system

Here's sample of Japanese writing, from Wikipedia Japanese article on keyboard:

キーボード(英: Keyboard)は、コンピュータへの入力機器の一つであり、手指でキーを押すことでコンピュータへ文字信号などを送信するもの。様々なソフトウェア上で文字入力を基本とした機器であるが、コンピュータ (OS) の操作全般にも用いられる。

日本語における 鍵盤はkey boardからの訳語であり両者は本来的に同一のものである。欧米においては鍵盤楽器のカラクリを応用した機械式タイプライターを経て、タイプライターのインタフェースを模した電子的入力機器へと連続的に発展していった歴史的経緯により一連の概念として理解されるが、タイプライターの普及が限定的に留まった日本の社会通念においては、楽器の鍵盤と入力機器のキーボードとは断絶しており個別に扱われることが多く、電子楽器のキーボードでわずかに関連性が示される程度である。

[2017-07-16 キーボード (コンピュータ)]

Those complex looking ones are kanji (Chinese characters). The cursive looking ones are hiragana, and angular ones are katakana.

In informal writing, such as online chat, less kanji is used.

To read Japanese newspaper or books, you need to know 2k kanji. See Jōyō kanji (常用漢字)

In comparison, for Chinese people reading Chinese newspaper, 3500 characters are needed. [〈通用规范汉字表〉 [Table of General Standard Chinese Characters]. Ministry of Education of the People's Republic of China. 18 Jun 2013.]

See also: How to Tell the Difference Between Chinese, Japanese, Korean?

How to Type Japanese

So, writing Japanese is hard. You have:

There are 2 major systems to input hiragana:

To input kanji, press a “conversion” key , then it'll convert previous kana character or phrase to kanji. Because there are many homonyms, typically a selection will popup to let you pick the correct kanji.

To input katakana, either switch to a dedicated katakana mode, or, the katakana shows as a choice among kanji character choices.

To input English letters (romaji), switch to romaji mode that lets you enter the English letters as is.

Japanese input method menu 39864
Progression of typing Japanese. First type English letters, it becomes hiragana, then press “conversion” a key, then choices of kanji or katakana.

That's the basics.

Most people in Japan, use romaji method to input Japanese. That is, on a normal PC keyboard with QWERTY layout, type the English letters of the kana reading, and it becomes the hiragana character, and press a key to convert the previous word to kanji or katakana (if desired).

This is a inefficient method, but requires no learning.

See also: Chinese Input Methods

Special Keys on Japanese Keyboards

Keyboards sold in Japan usually have special keys.

They are not necessary, as you can type Japanese with US keyboard. When a keyboard doesn't have these special keys, usually Space, Return, or a Ctrl combination works.

Here's the keys.

In Japanese and Chinese, each character is a square. Text are aligned vertically, forming a grid. The width of English letters are not the same as Japanese and Chinese. So, there's the idea of full-width English alphabet characters, where each character has the same width as the square, so that the text has columns aligned.

[see Unicode Full-Width Characters]

So, there's usually a key 半角/全角 or software toggle for user to chose between full-width or half-width. Half-with means using proportional font for English.

Note: Full-width English letters in Japanese text is not necessarily preferred, since English in full-width doesn't look good.

Apple keyboard Japan
Apple keyboard Japan. Note the 英数 (alphanumeric) key, and かな (kana) key.
happy hacking keyboard pro jp type s 447832
Happy Hacking Pro keyboard, Japan version. [see Happy Hacking Keyboard]
[image source geekhack.org, photo by 002]
The circle arrow key 🗘, that's 変換 (reads “henkan”, meaning “conversion”).
On the left with a slash is 無変換 (reads “muhenkan”, meaning “no conversion”.)
Also, note the kana key.

Japanese Keyboard Layouts

Japanese Keyboard Layouts

Japan keyboards

Japan FKB8579 661 thumb shift keyboard 45474 s335x187
Thumb-Shift, 1980
NEC PC 8801 K1 keyboard bj3qh-s333x188
NEC PC-8801-KI, 1983
NEC mini7 mqjdk-s306x204
NEC 文豪 Mini7, 1985
TRON Keyboard Unit TK1 s1520x831
TRON, 1986
nec m-type keyboard 1990 36618-s278x225
NEC M-system, 1990
NEC mini7rm 48190-s306x204
NEC 文豪 Mini7RM, 1992
NEC M-shiki keyboard NEC PC98 1992-s333x188
NEC PC-9801, 1992
NEC keyboard pk-kb015 2-s320x195
NEC Ergofit, 1998
scythe ergo diver keyboard left s289x217
Scythe Ergo Diver, ~2003
utron keyboard 02-s289x217
μTRON, 2007
Esrille keyboard 40445-s289x217
Esrille New

Keyboard Layouts

Dvorak

International

Layout Efficiency

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