Hepburn romanization

File:Kana & Romaji Chart.svg

Chart of kana and their Hepburn romanizations, including both hiragana (roman) and katakana (italicized)

Hepburn (Template:Langx, Template:Lit) is the main system of romanization for the Japanese language. The system was originally published in 1867 by American Christian missionary and physician James Curtis Hepburn as the standard in the first edition of his Japanese–English dictionary. The system is distinct from other romanization methods in its use of English orthography to phonetically transcribe sounds: for example, the syllable () is written as and () is written as , reflecting their pronunciation in English (compare to and in the more systematic Nihon-shiki and Kunrei-shiki systems).

In 1886, Hepburn published the third edition of his dictionary, codifying a revised version of the system that is known today as "traditional Hepburn". A version with additional revisions, known as "modified Hepburn", was published in 1908.

Although Kunrei-shiki was the style favored by the Japanese government for 70 years, Hepburn remained the most popular method of Japanese romanization. Recognizing this fact, on December 22, 2025, the Japanese government officially adopted Hepburn, making it the standard romanization system for the country.

It is learned by most foreign students of the language, and is used within Japan for romanizing personal names, locations, and other information, such as train tables and road signs. Because the system's orthography is based on English phonology instead of a systematic transcription of the Japanese syllabary, individuals who do not speak Japanese and know English phonology will generally be more accurate when pronouncing unfamiliar words romanized in the Hepburn style compared to other systems.

History

File:James Curtis Hepburn.jpg

James Curtis Hepburn, creator of the system

In 1867, American Presbyterian missionary doctor James Curtis Hepburn published the first Japanese–English dictionary, in which he introduced a new system for the romanization of Japanese into Latin script. He published a second edition in 1872 and a third edition in 1886, which introduced minor changes. The third edition's system had been adopted in the previous year by the , a group of Japanese and foreign scholars who promoted a replacement of the Japanese script with a romanized system.

Hepburn romanization, loosely based on the conventions of English orthography (spelling), stood in opposition to Nihon-shiki, which had been developed in Japan in 1881 as a script replacement. Compared to Hepburn, Nihon-shiki is more systematic in its representation of the Japanese syllabary (kana), as each symbol corresponds to a phoneme. However, the notation requires further explanation for accurate pronunciation by non-Japanese speakers: for example, the syllables and , which are written as and in Hepburn, are rendered as and in Nihon-shiki. After Nihon-shiki was presented to the in 1886, a dispute began between the supporters of the two systems, which resulted in a standstill and an eventual halt to the organization's activities in 1892.

After the Russo-Japanese War of 1904–1905, the two factions resurfaced as the , which supported Hepburn's style, and the , which supported Nihon-shiki. In 1908, Hepburn was revised by educator Kanō Jigorō and others of the , which began calling it the or .

In 1930, a Special Romanization Study Commission, headed by the Minister of Education, was appointed by the government to devise a standardized form of romanization. The Commission eventually decided on a slightly modified "compromise" version of Nihon-shiki, which was chosen for official use by cabinet ordinance on September 21, 1937; this system is known today as Kunrei-shiki. On September 3, 1945, at the beginning of the occupation of Japan after World War II, Supreme Commander for the Allied Powers Douglas MacArthur issued a directive mandating the use of modified Hepburn by occupation forces. The directive had no legal force, however, and a revised version of Kunrei-shiki was reissued by cabinet ordinance on December 9, 1954, after the end of occupation.

Although it lacked de jure status, Hepburn remained the de facto standard for multiple applications in Japan. As of 1977, many government organizations used Hepburn, including the Ministry of International Trade and Industry; the Ministry of Foreign Affairs requires the use of Hepburn on passports, and the Ministry of Land, Infrastructure and Transport requires its use on transport signs, including road signs and railway station signs. According to a survey by the Japanese Agency for Cultural Affairs in 2022, the Japanese primarily used Hepburn to spell place names. Hepburn is also used by private organizations, including The Japan Times and the Japan Travel Bureau.

American National Standard System for the Romanization of Japanese (ANSI Z39.11-1972), based on modified Hepburn, was approved in 1971 and published in 1972 by the American National Standards Institute. In 1989, it was proposed for International Organization for Standardization (ISO) standard 3602, but was rejected in favor of Kunrei-shiki. ANSI Z39.11-1972 was deprecated as a standard in 1994.

In January 2024, the Cultural Affairs Agency proposed revising the 1954 Cabinet ordinance to make Hepburn the standard romanization system of Japan.

On December 16, 2025, the Japanese government decided to issue a cabinet notification on December 22 revising national rules on romanization for the first time in about 70 years, making the Hepburn system the standard instead of Kunrei-shiki.

Variants

File:Toyooka Station Sign (cropped).jpg

Former Japan National Railways–style board of Toyooka Station. For the two adjacent stations, "GEMBUDŌ" follows the Hepburn romanization system, but "KOKUHU" follows both the Nihon-shiki and Kunrei-shiki systems.

There are many variants of the Hepburn romanization. The two most common styles are as follows:

• Traditional Hepburn, as defined in various editions of Hepburn's dictionary, with the third edition (1886) often considered authoritative (although changes in kana usage must be accounted for). It is characterized by the rendering of syllabic as before the consonants b, m and p: for example, for .
• Modified Hepburn, also known as Revised Hepburn, in which (among other changes) the rendering of syllabic as before bilabial consonants is no longer used: for . The version of the system published in the third (1954) and later editions of Kenkyusha's New Japanese-English Dictionary are often considered authoritative; it was adopted in 1989 by the Library of Congress as one of its ALA-LC romanizations, and is the most common variant of Hepburn romanization used today.

In Japan itself, there are some variants officially mandated for various uses:

• , which mostly follows Modified Hepburn, except syllabic is rendered as in Traditional. Japan Railways and other major railways use it for station names.
• , used for road signs, which otherwise follows Modified Hepburn closely but specifies that macrons are not to be used.
• , a permissive standard that renders the syllabic as before b, m and p. Most of the long vowels are not rendered, and macrons are not used above the letter. Moreover, this standard explicitly allows the use of in personal names with special approval, notably for passports. In particular, the long vowel ō can be romanized , or (, or for ).

Details of the variants can be found below.

Obsolete variants

The romanizations set out in the first and second versions of Hepburn's dictionary are primarily of historical interest. Notable differences from the third and later versions include:

Second version

• and were written as : Yedo
• and were written as : kudzu, tsudzuku
• , , and were written as , and
• (modern: ) was written as : Kuwannon, kuwaidan

First version

The following differences are in addition to those in the second version:

• was written as .
• was written as .
• and were written as .

Features

The main feature of Hepburn is that its orthography is based on English phonology. More technically, when syllables that are constructed systematically according to the Japanese syllabary contain an "unstable" consonant in the modern spoken language, the orthography is changed to something that better matches the real sound as an English-speaker would pronounce it. For example, is written not . This transcription is thus only partly phonological.

Some linguists such as Harold E. Palmer, Daniel Jones and Otto Jespersen object to Hepburn, contending that the pronunciation-based spellings can obscure the systematic origins of Japanese phonetic structures, inflections, and conjugations. Since the vowel sounds in Hepburn are similar to the vowel sounds in Italian, and the consonants similar to those of many other languages, in particular English, speakers unfamiliar with Japanese will generally be more accurate when pronouncing unfamiliar words romanized in the Hepburn style compared to other systems.

Long vowels

In Hepburn, vowel combinations that form a long sound are usually indicated with a macron (◌̄). Other adjacent vowels, such as those separated by a morpheme boundary, are written separately:

Vowels part of the same morpheme

	in traditional Hepburn	in modified Hepburn
A + A	aa: – 'grandmother' (ba + a)	ā: – 'grandmother' (ba + a)
I + I	ii: – (ni + i)
U + U	ū: – 'mathematics' (su + u)
E + E	ee: – 'older sister' (ne + e)	ē: – 'older sister' (ne + e)
O + O	ō: – 'detour' (to + o)
O + U	ō: – 'study' (kyo + u)

Vowels part of separate morphemes

	In traditional and modified Hepburn
A + A	aa: – + – 'evil'
I + I	ii: – + – 'grey' (also terminal adjectives: – + – 'good')
U + U	uu: – + – 'lake' (also terminal verbs: – + – 'to eat')
E + E	ee: – + – 'open veranda'
O + O	oo: – + – 'dance of joy'
O + U	ou: – + – 'calf' (also terminal verbs: – + – 'to get lost')

All other vowel combinations are always written separately:

• E + I: – + – 'uniform' (despite E + I often being pronounced as a long E)
• U + I: – + – 'light (in weight)'
• O + I: – – 'nephew'

Loanwords

In foreign loanwords, long vowels followed by a chōonpu (ー) are indicated with macrons:

• : se + (ー) + ra + (ー) = 'sailor'
• : ta + ku + shi + (ー) = 'taxi'
• : ko + n + ku + (ー) + ru = 'competition'
• : ba + re + (ー) + bo + (ー) + ru = 'volleyball'
• : so + (ー) + ru = 'sole (of a shoe, etc.)'

Adjacent vowels in loanwords are written separately:

• : ba + re + e – 'ballet'
• : mi + i + ra – 'mummy'
• : so + u + ru – 'soul', 'Seoul'

Variations

There are many variations on the Hepburn system for indicating long vowels with a macron. For example, () is properly romanized as Tōkyō, but can also be written as:

• – not indicated at all. Common for Japanese words that have been adopted into English, and the de facto convention for Hepburn used in signs and other English-language information around Japan.
• – indicated with circumflex accents, as in the alternative Nihon-shiki and Kunrei-shiki romanizations.
• – indicated with an h (only applies after o). This is sometimes known as "passport Hepburn", as the Japanese Foreign Ministry has authorized (but not required) it in passports.
• – written using kana spelling: ō as ou or oo (depending on the kana). This is also known as style, as it reflects how text is entered into a Japanese word processor by using a keyboard with Roman characters. more accurately represents the way that ō is written in kana by differentiating between (as in (), in ) and (as in (), in ); however, it fails to differentiate between long vowels and vowels separated by a morpheme boundary.
• – written by doubling the long vowels. Some dictionaries such as the Pocket Kenkyusha Japanese Dictionary and Basic English Writers' Japanese-English Wordbook follow this style, and it is also used in the JSL form of romanization.

Particles

In traditional and modified:

• When is used as a particle, it is written .

In traditional Hepburn:

• When is used as a particle, Hepburn originally recommended . This spelling is obsolete, and it is commonly written as (Romaji-Hirome-Kai, 1974).
• When is used as a particle, it is written .

In modified Hepburn:

• When is used as a particle, it is written .
• When is used as a particle, it is written .

Syllabic n

In traditional Hepburn:

Syllabic () is written as before consonants, but as before labial consonants: b, m, and p. It is sometimes written as n- (with a hyphen) before vowels and y (to avoid confusion between, for example, n + a and , and n + ya and ), but its hyphen usage is not clear.

• : – guide
• : – Gunma
• : – simple
• : – trust

In modified Hepburn:

The rendering m before labial consonants is not used and is replaced with . It is written n' (with an apostrophe) before vowels and y.

• : – guide
• : – Gunma
• : – simple
• : – trust

Long consonants

Elongated (or "geminate") consonant sounds are marked by doubling the consonant following a sokuon, ; for consonants that are digraphs in Hepburn (sh, ts), only the first consonant of the set is doubled, except for ch, which is replaced by tch.

• : – result
• : – quickly
• : – all the time
• : – ticket
• : – magazine
• : – together
• : (not ) – this way
• : (not ) – matcha
• : – three

Romanization charts

あ ア	い イ	う ウ	え エ	お オ
か カ	き キ	く ク	け ケ	こ コ	きゃ キャ	きゅ キュ	きょ キョ
さ サ	し シ	す ス	せ セ	そ ソ	しゃ シャ	しゅ シュ	しょ ショ
た タ	ち チ	つ ツ	て テ	と ト	ちゃ チャ	ちゅ チュ	ちょ チョ
な ナ	に ニ	ぬ ヌ	ね ネ	の ノ	にゃ ニャ	にゅ ニュ	にょ ニョ
は ハ	ひ ヒ	ふ フ	へ ヘ	ほ ホ	ひゃ ヒャ	ひゅ ヒュ	ひょ ヒョ
ま マ	み ミ	む ム	め メ	も モ	みゃ ミャ	みゅ ミュ	みょ ミョ
や ヤ		ゆ ユ		よ ヨ
ら ラ	り リ	る ル	れ レ	ろ ロ	りゃ リャ	りゅ リュ	りょ リョ
わ ワ	ゐ ヰ  †		ゑ ヱ  †	を ヲ  ‡
				ん ン  /
が ガ	ぎ ギ	ぐ グ	げ ゲ	ご ゴ	ぎゃ ギャ	ぎゅ ギュ	ぎょ ギョ
ざ ザ	じ ジ	ず ズ	ぜ ゼ	ぞ ゾ	じゃ ジャ	じゅ ジュ	じょ ジョ
だ ダ	ぢ ヂ	づ ヅ	で デ	ど ド	ぢゃ ヂャ	ぢゅ ヂュ	ぢょ ヂョ
ば バ	び ビ	ぶ ブ	べ ベ	ぼ ボ	びゃ ビャ	びゅ ビュ	びょ ビョ
ぱ パ	ぴ ピ	ぷ プ	ぺ ペ	ぽ ポ	ぴゃ ピャ	ぴゅ ピュ	ぴょ ピョ

• Each entry contains hiragana, katakana, and Hepburn romanization, in that order.
• † — The characters in red are historical characters and are obsolete in modern Japanese. In modern Hepburn romanization, they are often undefined.
• ‡ — The characters in blue are rarely used outside of their status as a particle in modern Japanese, and romanization follows the rules above.

Extended katakana

These combinations are used mainly to represent the sounds in words in other languages.

Digraphs with orange backgrounds are the general ones used for loanwords or foreign places or names, and those with blue backgrounds are used for more accurate transliterations of foreign sounds, suggested by the Cabinet of Japan's Ministry of Education, Culture, Sports, Science and Technology. Katakana combinations with beige backgrounds are suggested by the American National Standards Institute and the British Standards Institution as possible uses. Ones with purple backgrounds appear on the 1974 version of the Hyōjun-shiki formatting.

	イィ		イェ
ウァ *	ウィ	ウゥ *	ウェ	ウォ
		ウュ
ヴァ	ヴィ	ヴ ⁑	ヴェ	ヴォ
ヴャ		ヴュ	ヴィェ	ヴョ
			キェ
			ギェ
クァ	クィ		クェ	クォ
クヮ
グァ	グィ		グェ	グォ
グヮ
			シェ
			ジェ
	スィ
	ズィ
			チェ
ツァ	ツィ		ツェ	ツォ
		ツュ
	ティ	トゥ
		テュ
	ディ	ドゥ
		デュ
			ニェ
			ヒェ
			ビェ
			ピェ
ファ	フィ		フェ	フォ
フャ		フュ	フィェ	フョ
		ホゥ
			ミェ
			リェ
ラ゚	リ゚	ル゚	レ゚	ロ゚
ヷ ⁂	ヸ ⁂		ヹ ⁂	ヺ ⁂

• * — The use of in these two cases to represent w is rare in modern Japanese except for Internet slang and transcription of the Latin sound into katakana. E.g.: ミネルウァ (Mineruwa "Minerva", from Latin MINERVA ); ウゥルカーヌス (Wurukānusu "Vulcan", from Latin VVLCANVS, Vulcānus ). The wa-type of foreign sounds (as in watt or wipe) is usually transcribed to ワ (wa), while the wu-type (as in wood or woman) is usually to ウ () or ウー ().
• ⁑ — has a rarely used hiragana form in that is also in Hepburn romanization systems.
• ⁂ — The characters in green are obsolete (out of date) in modern Japanese and very rarely used.

See also

• List of ISO romanizations

External links

• Preface of Hepburn's original dictionary, explaining romanization: First edition, Third edition