How to Type Japanese: A Practical IME Guide for Windows, Mac, iOS and Android

Typing Japanese looks intimidating from the outside: three scripts, thousands of kanji, and a keyboard with only 26 letters. In practice, every major operating system ships with a Japanese input method editor (IME) that does the heavy lifting. You type sounds, the IME turns them into kana, and then it offers kanji conversions. Once you know a dozen rules, you can type almost anything.

This guide from the POMODIARY team covers how an IME works, how to set one up on each platform, the romaji rules that trip up learners, and a list of gotchas worth knowing before they cost you time.

How a Japanese IME works

An IME sits between your keyboard and the app you are typing in. The typical flow has three steps:

Composition. You type romaji such as nihongo. The IME shows にほんご with an underline, meaning the text is not committed yet.
Conversion. You press Space. The IME guesses the most likely kanji and kana mix, for example 日本語. Press Space again to see more candidates.
Commit. You press Enter, and the text is inserted into the document.

The IME guesses from context, so typing a whole phrase before converting usually gives better results than converting each word separately. Typing watashihanihongowobenkyoushiteimasu and pressing Space once often yields 私は日本語を勉強しています directly.

Setting up the IME

Windows

Open Settings, go to Time and language, then Language and region, and add Japanese. Windows installs Microsoft IME. Switch between English and Japanese with the language icon in the taskbar or the Windows key plus Space. Inside the Japanese IME, Alt plus the grave accent key (the one left of 1 on a US keyboard) toggles between direct alphanumeric input and hiragana input. On a Japanese keyboard, the 半角/全角 key does the same.

macOS

Open System Settings, then Keyboard, then Input Sources, and add Japanese (Romaji). Switch input sources with Control plus Space, or with the Globe or fn key, depending on your settings. Once added, the menu bar shows the current mode; you can pick Hiragana, Katakana or Romaji there.

iOS and iPadOS

Go to Settings, General, Keyboard, Keyboards, Add New Keyboard, and choose Japanese. You will be offered two layouts: Romaji, which uses a QWERTY layout, and Kana, which is a 12-key flick keyboard. Tap the globe key to switch keyboards.

Android

With Gboard, open the Gboard settings, choose Languages, add Japanese, and select a layout. The common choices are 12-key (flick input) and QWERTY (romaji). Other Android keyboards offer similar options.

Flick input in brief

On a 12-key layout, each key holds one row of the kana chart. Tapping か gives か; flicking left gives き, up gives く, right gives け, down gives こ. It is very fast once learned and is how many people in Japan type on phones. Romaji QWERTY is easier to start with if you already type English.

Romaji rules you need to know

IME romaji is not exactly the same as textbook romanisation. It follows kana spelling, not pronunciation.

You want	Type	Notes
っ (small tsu)	double the next consonant: kitte → きって	Works with any consonant: zasshi → ざっし, matcha → まっちゃ
Standalone small っ	xtu or ltu	Useful for exclamations like あっ
ん	nn, or n before a consonant	A single n before a consonant (konban → こんばん) or at the end before Space usually becomes ん
ん before a vowel or y	nn or n'	genin gives げにん; type gennin or gen'in for げんいん
Small ゃゅょ	kya, shu, cho, etc.	Standalone: xya, lyu, xyo
Small ぁぃぅぇぉ	xa, li, xu, etc.	Also in combos: fa → ふぁ, thi → てぃ, dhi → でぃ
Particle は	ha	Pronounced wa, spelled は
Particle へ	he	Pronounced e
Particle を	wo	Pronounced o
ぢ and づ	di and du	Needed for words like 縮む (ちぢむ) and 続く (つづく)
ヴ	vu	Shows up in loanwords
Long vowel mark ー	the minus key	Used in katakana: ko-hi- → こーひー → コーヒー

A few alternatives are accepted interchangeably: shi or si for し, chi or ti for ち, tsu or tu for つ, fu or hu for ふ, ji or zi for じ.

Long vowels in hiragana

In hiragana words, long vowels are spelled with kana, not the minus key. Type toukyou for とうきょう, not to-kyo-. Type ookii for おおきい, and oneesan for おねえさん. The ou versus oo spelling depends on the word: 東京 is とうきょう, but 大きい is おおきい. A dictionary will tell you which one is correct.

Converting to kanji efficiently

Space converts and cycles candidates; the candidate list also opens with a second press.
Arrow keys (left and right) move between segments when the IME splits a phrase into chunks. Shift plus an arrow resizes a segment if the IME split it in the wrong place.
F6 converts the composition to hiragana, F7 to full-width katakana and F8 to half-width katakana on Windows. On a Mac, Control plus J converts to hiragana and Control plus K to katakana, and the function keys behave the same way if you enable Windows-like shortcuts in the Japanese input source settings.
F10 converts to half-width romaji, which helps when you accidentally typed an English word in Japanese mode.
Enter commits without further conversion, so if you want hiragana, simply press Enter instead of Space.

Common gotchas

Wrong kanji from a correct reading

Many words share a reading. こうえん can be 公園 (park), 講演 (lecture) or 公演 (performance). Type more context, such as kouendesanpo, so the IME can pick the right one, or read the candidate list carefully.

Accidental full-width letters and numbers

In Japanese mode, digits and letters may come out full-width (１２３ instead of 123). This breaks passwords, URLs and spreadsheet formulas. Switch to direct input for these, or press F10 before committing.

The stray n

Typing kon'nichiha correctly gives こんにちは. Typing konichiha gives こにちは, which is wrong. If an ん seems to vanish, check whether the next letter was a vowel or y.

Learned wrong suggestions

IMEs learn from what you commit. If you once picked a wrong kanji, it may keep suggesting it first. Both Windows and macOS let you clear the learning history or remove a single candidate from the conversion list.

Punctuation

In Japanese mode the period key gives 。 and the comma gives 、. The slash often gives ・, and the square bracket keys give 「 and 」. Know these, because Japanese text normally uses them instead of Western punctuation.

Practising until it is automatic

The setup takes ten minutes. Fluency takes repetition. The fastest way to get there is to type real sentences every day: notes in Japanese, messages to a language partner, or transcripts of audio you are studying. Pay particular attention to long vowels, small tsu and ん, because these are the spots where your knowledge of the language and your typing habits meet.

If you want structured drills, FlowType.AI offers browser-based typing practice for kana, vocabulary and sentences with romaji input and immediate feedback on each keystroke, which makes it easy to spot exactly where your romaji habits are off.

Quick checklist

Add Japanese (Romaji) input on every device you use.
Learn the toggle shortcut for your system and practise switching without looking.
Memorise the double-consonant rule for っ and the nn rule for ん.
Remember ha, he and wo for the particles は, へ and を.
Convert phrases, not single words, to get better kanji guesses.
Use F6 to F10 to fix the script of a word before committing.
Read the candidate list instead of trusting the first suggestion.