Japanese Language Tools
Small, exact tools for handling Japanese text. Each one runs entirely in your browser — nothing you type is uploaded, stored, or sent anywhere — and each explains the rules it follows, because a converter you cannot check is a converter you cannot trust.
Why this section exists
Most romaji converters online are a text box with no explanation. That is fine until the output looks wrong, at which point you have no way to tell whether the tool is mistaken or your expectation is — and Japanese has several places where a reasonable expectation and the correct answer differ.
These tools state the rules they apply and where they deliberately stay literal, so you can check the result rather than trust it. They also run locally, which matters more than it sounds: text people convert is often a name, an address, or something they have not published yet.
Popular tools
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Converters
Convert between romaji, hiragana and katakana in your browser. Free, instant, and nothing you type leaves your device.
ExploreText
Analyse Japanese text in your browser: count characters by script, and see how much of a passage is kanji, kana or Latin.
ExploreCalendar
Convert between Japanese imperial era years (和暦) and Western years, including the years that span two eras.
ExploreAll language tools
Romaji to Hiragana
Type Japanese in the Latin alphabet and get hiragana back instantly, in your browser.
Read guideHiragana to Katakana
Turn hiragana into katakana instantly, in your browser.
Read guideKatakana to Hiragana
Turn katakana into hiragana instantly, in your browser.
Read guideFull-width & Half-width
Fix text a Japanese form rejects: convert between full-width and half-width characters.
Read guideCharacter Counter
Count Japanese text by script — hiragana, katakana, kanji, Latin and digits.
Read guideEra Converter
Convert between Japanese imperial era years (和暦) and Western years, both directions.
Read guideWho these tools are for
Learners writing in kana
You know the sounds but not yet the shapes, and you want to see how a word you can say is actually spelled.
Anyone without a Japanese keyboard
You need kana on a machine you cannot install an input method on, for a form, a search box, or a message.
People checking someone else's romaji
You have a name or place written in the Latin alphabet and want the kana it corresponds to, including where the romanisation is ambiguous.
What is coming next
More kana converters
Hiragana to katakana, katakana to hiragana, and romaji to katakana — the same engine and the same page shape, one registry entry each.
Reading aids
Tools that annotate rather than replace, for text you want to read rather than rewrite.
Frequently asked questions
Do these tools send my text anywhere?
No. Every conversion runs in JavaScript in your browser. Nothing you type is uploaded, logged, or stored — you can disconnect from the network and the tools keep working.
Are they free?
Yes, and there is no sign-up, no usage limit, and no advertising. The site carries no affiliate links or paid placement.
Which romanisation do they accept?
Modified Hepburn (shi, chi, tsu, fu, ji) is the primary spelling, and the common Kunrei variants (si, ti, tu, hu, zi) are accepted too, because people type the system they were taught. Both produce the same kana.