What is the best free tool to add furigana to Japanese text?

The best free furigana reader tools in 2026 are Yomimaru (adaptive JLPT-level furigana on any text you import), Yomichan/Yomitan (browser extension for hover-over furigana on any webpage), and ichi.moe (grammar breakdown with furigana per sentence). For reading full documents rather than individual word lookups, Yomimaru is the most complete free option.

Can I add furigana to Japanese text on my phone?

Yes. Yomimaru works in mobile browsers with no app installation required — paste any Japanese text and the furigana reader applies immediately. Jisho.org also works on mobile for individual word lookups. Browser extensions like Yomichan require a desktop browser and are not available on iOS or Android.

What is the difference between furigana and romaji?

Furigana are small hiragana or katakana characters printed above a kanji to show its pronunciation. Romaji is the representation of Japanese sounds using the Latin alphabet. Furigana keeps you reading within the Japanese writing system and builds kanji recognition over time. Relying on romaji prevents you from developing the reading skills needed for real Japanese texts, which never include romaji.

What is adaptive furigana and how does it work in Yomimaru?

Adaptive furigana shows pronunciation guides only for kanji above a set difficulty level. In Yomimaru, you choose your JLPT level (N5 to N1), and furigana appears only on kanji beyond that level. An N3 learner sees furigana on N2 and N1 kanji but not on N4 and N5 kanji they already know. This removes the training wheels selectively, building kanji recognition without leaving you stranded on genuinely hard characters.

Best Furigana Reader Tools Online: Add Furigana to Any Japanese Text (2026)

The best free furigana reader tools online in 2026 are Yomimaru (adaptive JLPT-level furigana on any text you import), Yomichan/Yomitan (browser extension for hover-over furigana on any webpage), Jisho.org (word-level furigana lookup), and ichi.moe (grammar breakdown with furigana per sentence). For reading complete documents — an article, a light novel chapter, any text you choose — Yomimaru is the most capable free option because it applies furigana to content you bring in, calibrated to your level.

What Is a Furigana Reader?

A furigana reader is any tool that displays pronunciation guides above Japanese kanji, allowing learners to read words they could not otherwise decode. The pronunciation guides are written in hiragana or katakana — the phonetic alphabets Japanese learners typically learn first.

Furigana appears naturally in children's books, manga, and beginning-level Japanese textbooks. Adult Japanese media — newspapers, novels, websites, business documents — does not include it. A furigana reader bridges this gap, making authentic texts accessible before a learner has memorized all the kanji they contain.

The challenge is that not all furigana tools are the same. Some add furigana to individual words you click. Others add it to full documents. The best tools go further: they let you control which kanji get furigana based on what you already know.

Why Learning to Read Without Furigana Is the Long-Term Goal

Here is a paradox that surprises many learners: the best furigana readers are designed to help you need furigana less over time.

Reading with furigana on every single kanji trains your eyes to skip the kanji character and read the furigana instead. This feels easier in the short term but creates a dependency that slows kanji acquisition. You are reading hiragana, not kanji — and Japanese adults read kanji.

The solution is adaptive furigana: showing pronunciation guides only for kanji above your current knowledge level, so your brain is forced to recognize the kanji you have already learned while still getting help on genuinely unknown ones.

This is how children in Japan read — kanji they know have no furigana; kanji above their grade level are annotated. It is also what the best adult learner tools now implement.

The Best Furigana Reader Tools Online

Yomichan / Yomitan — Best Browser Extension

Yomichan (now continued as Yomitan) is a free browser extension for Chrome, Firefox, and Edge. It adds instant hover-over furigana and dictionary definitions to any Japanese webpage: news articles, Wikipedia, fan sites, blogs, Twitter/X posts — anything rendered in your browser.

How it works: Hover your mouse over any kanji or word. A popup appears showing the reading in hiragana, the English definition, and the JLPT level of the word. No clicking or copy-pasting required.

Best for: Learners who read Japanese content on the web and want instant lookups without leaving the page. Yomitan is the gold standard for this use case and is genuinely excellent.

Limitations: Desktop-only — browser extensions do not work on iOS or Android. Does not work on PDF files, images, or content you paste in from another source. No adaptive furigana (it shows furigana on everything you hover, rather than filtering by your level). Cannot be used on apps, ebooks, or downloaded files. Grammar explanations require separate lookup.

Jisho.org — Best for Word-Level Lookup

Jisho is a free Japanese-English dictionary with furigana display on all entries. Search for any word, kanji, or sentence fragment and get a clean display with readings, meanings, pitch accent, and example sentences — all with furigana.

Best for: Confirming the reading and meaning of a specific word you encountered elsewhere. Jisho is fast and reliable for individual lookups.

Limitations: Not a reading interface. You cannot paste in a full text and read it with furigana throughout — only individual word lookups. Works well on mobile. No grammar analysis.

ichi.moe — Best for Sentence-Level Grammar Breakdown

ichi.moe is a free web tool that parses Japanese sentences and displays each component with furigana, grammatical role, and English glosses. Paste in a sentence, and it breaks it down word by word showing what each element does.

Best for: Beginners who want to understand the grammatical structure of specific sentences they are struggling with. Excellent for examining why a sentence works the way it does.

Limitations: Not a full reading interface — best used on one or two sentences at a time, not whole articles. The parser occasionally struggles with complex or colloquial sentences. No continuous reading flow.

Kuroshiro — For Developers Only

Kuroshiro is an open-source JavaScript library that automatically adds furigana to Japanese text. Developers can integrate it into web apps, tools, or browser scripts.

Best for: Developers building their own Japanese reading tools or websites who need a programmatic furigana conversion engine.

Limitations: Requires technical setup — not usable by learners who want a finished product. No reading interface, no dictionary, no grammar help.

Yomimaru — Best for Reading Full Japanese Texts

Yomimaru is a Japanese reading platform that applies furigana to any text you import: paste in an article, a chapter from a novel, a recipe, a company announcement, or a manga transcript, and the full reading interface activates immediately.

What makes it different from the tools above:

Adaptive JLPT-level furigana. This is the feature the other tools do not have. Set your JLPT level (N5 to N1), and Yomimaru shows furigana only on kanji above that level. An N3 learner sees no furigana on N4 and N5 kanji — kanji they should already know — and furigana only on N2+ kanji. This builds recognition of known kanji during real reading, rather than letting eyes fall back to hiragana readings every time.

Custom text import. Yomichan works only on webpages rendered in your browser. Yomimaru works on any text you bring in — a PDF you copied, an ebook extract, a private message, anything. If you can paste it, Yomimaru can apply furigana to it.

Tap-to-lookup dictionary. Tap any word to see the reading, JLPT level, meaning, pitch accent, and example sentences. The lookup does not break your reading flow the way switching to Jisho does.

AI grammar explanations. When you highlight a confusing sentence, Maru-Sensei breaks down its grammatical structure: which particle does what, where relative clauses begin and end, what the subject of a passive construction is. This replaces ichi.moe lookups — but inline, on content you chose to read.

Try Yomimaru's furigana reader — no credit card required →

Feature Comparison

|---|---|---|---|---|

| Free | ✓ | ✓ | ✓ | Free tier + paid plans |

| Adaptive furigana by JLPT level | ✗ | ✗ | ✗ | ✓ |

| Works on PDFs / ebooks | ✗ | ✗ | ✗ | ✓ (paste text) |

Which Furigana Tool Is Right for You?

Use Yomichan/Yomitan if: You do most of your Japanese reading on websites in a desktop browser and want instant hover-over lookups without changing your workflow. It is the most frictionless tool for web-based extensive reading.

Use Jisho.org if: You need a quick, reliable dictionary lookup for a specific word and want to see the kanji reading clearly. Best as a supplement, not a reading environment.

Use ichi.moe if: You are a beginner trying to understand the grammatical structure of a specific difficult sentence — why the particles work the way they do, how the verb conjugation chains together.

Use Yomimaru if: You want to read full Japanese texts you choose yourself — not just webpages — with adaptive furigana that fades as you improve, plus AI grammar help on demand. Especially useful once you start reading authentic content at N3 and above, where texts are not available on the open web and you need to paste in your own material.

Many learners use Yomichan and Yomimaru together: Yomichan for casual web reading and news, Yomimaru for structured reading sessions with material they bring in themselves.