Romaji to Hiragana Converter Online

What is Romaji to Hiragana Converter Online?

It is a conversational transliterator that turns Latin-script Japanese (romaji) into hiragana characters. You type something like konnichiwa or gakkou, and it returns こんにちは or がっこう as copyable text. The job is character substitution, not translation: it does not decide what an English sentence means in Japanese, and it does not choose kanji. It reads the letters you give it and maps them to kana.

Key Features

• A complete stated mapping table. The five vowels, the k, s, t, n, h, m, y, r and w rows, standalone n, and the digraphs shi, chi, tsu, sha, shu, sho, cha, chu, cho, ja, ju, jo are all defined up front, so you can see exactly what will happen before you type.
• Voiced and semi-voiced rows. Dakuten forms (ga, za, da, ba rows) and handakuten forms (pa row) are handled, along with the small-kana combinations such as kya, kyu, kyo.
• Small kana, sokuon and long vowels. kya, kyu, kyo and similar combinations produce small ゃ ゅ ょ; a doubled consonant produces っ, and the clusters tch and cch are explicit entries, so matcha becomes まっちゃ; ou, oo, aa, ii, uu and ee are defined long-vowel entries, so kyou becomes きょう.
• Longest-match resolution. Overlapping sequences are resolved by trying the longest defined romaji sequence first, so sha becomes しゃ rather than し plus a stray あ. The apostrophe rule is applied before longest match, so n'ya becomes んや rather than にゃ.
• A conversion report. After the hiragana block, you get a short list of any characters that had no mapping, so nothing disappears silently.
• Reverse direction on request. Ask for hiragana-to-romaji and you get a fixed Hepburn reading back, with the same reporting for unmapped kana.

How to Use

1. Type or paste your romaji into the message box. Plain letters, spaces, punctuation and line breaks are all fine. Example: watashi wa gakusei desu.
2. Read the hiragana block first. It appears as a separate copyable block, followed by a short note on any characters that could not be converted.
3. Ask for a change if you need one: switch to reverse mode, keep punctuation as-is, or convert only part of the text. Each follow-up works on the text already in the conversation.

Example Use Cases

• Checking a romaji spelling before study. You wrote gakkou and want to confirm it renders as がっこう with the small っ, not がこう.
• Rendering a name or short phrase in kana. You have hanako or arigatou and want the hiragana characters to paste into a document or flashcard.
• Reverse reading practice. You have a hiragana line such as こんにちは and want a romaji reading to check your pronunciation guess.
• Seeing why a result looks the way it does. You got an unexpected output for kyou or matcha; here the full table shows which rule fired.

Tips for Best Results

• Write romaji the way Japanese textbooks do: ou or oo for long o, doubled consonants for っ, and n' before a vowel when you mean standalone ん.
• If a word comes back with a reported unmapped character, that character is usually punctuation or a symbol outside the table; ask to keep it unchanged and it will be preserved.
• For reverse conversion, paste hiragana only. Mixed kanji and kana input will convert the kana and report the kanji as unmapped.

FAQ

What input format does it accept?
Plain Latin text up to a few thousand characters per message. Spaces, punctuation and line breaks are preserved. If the text is very long, it is converted in parts with an explicit truncation notice, and you can ask for the remainder.

How accurate is the output?
The conversion is deterministic: the same input always gives the same hiragana, because it follows a fixed published table. Accuracy therefore depends on whether your romaji follows standard conventions. Non-standard spellings may produce a literal but unexpected result, and the report will tell you which rule fired.

How does the conversion handle overlaps?
It scans left to right and tries the longest defined sequence first, so sha becomes しゃ and kyou becomes きょう. The apostrophe rule takes precedence, so n'ya becomes んや. Anything with no mapping is preserved and listed.

Does it translate English into Japanese?
No. It converts the letters you type into kana. It does not choose vocabulary or kanji for an English sentence.