Best Japanese Dictionaries Online: A Complete Guide

A good dictionary is the most important tool in a language learner’s arsenal. For Japanese learners specifically, the right dictionary can mean the difference between understanding a sentence and being completely lost. Japanese presents unique challenges — kanji with multiple readings, complex compound words, homophones distinguished only by pitch accent, and a vast vocabulary drawn from multiple historical layers.

Fortunately, the internet offers an abundance of excellent Japanese dictionary resources, both free and paid. This guide covers the best options available, from beginner-friendly bilingual dictionaries to advanced monolingual resources, mobile apps, and browser extensions that integrate dictionary lookups into your daily browsing.

What to Look for in a Japanese Dictionary

Before diving into specific resources, it helps to understand what features matter most.

Kanji lookup by radical or stroke: When you encounter an unfamiliar kanji, you need to look it up without knowing its reading. The best dictionaries support radical lookup, handwriting recognition, or SKIP code searching.

Multiple example sentences: A dictionary entry should show the word used in context. Example sentences reveal usage patterns, common collocations, and appropriate contexts.

Pitch accent information: Knowing the pitch pattern of a word is essential for correct pronunciation and listening comprehension. Not all dictionaries include this, but the best ones do.

Frequency information: Knowing whether a word is common (JLPT-level vocabulary) or rare helps you prioritize what to learn.

Integration capabilities: The best dictionary is the one you will actually use. Browser extensions, pop-up dictionaries, and mobile widgets make lookups frictionless.

Bilingual Dictionaries (Japanese to English)

Jisho.org

Jisho is the most popular free Japanese-English dictionary online. It has a clean interface, powerful search features, and extensive data.

Jisho’s search supports multiple modes. You can search by English meaning, Japanese word (in kanji or kana), or individual kanji. The search parser understands several special search commands: #kanji for kanji-specific results, #jlpt-n5 through #jlpt-n1 to filter by JLPT level, and #common to show only common words.

Each word entry includes readings, definitions, example sentences (from the Tanaka Corpus), JLPT level, and commonly used compounds. Kanji entries show stroke order diagrams, radical information, readings, and example words at various levels.

Jisho also has a radical-based kanji search. Click the “Radicals” button to select radicals visually, which helps when you encounter an unknown kanji and need to look it up without knowing its reading.

The main limitation of Jisho is that the data comes from open-source projects (JMdict and KANJIDIC). This means some entries have translation quirks, and pitch accent information is limited. However, for most learner needs, Jisho is the best free option.

Weblio

Weblio is a major Japanese dictionary aggregator that pulls data from multiple sources. It is available in both English-Japanese and Japanese-only versions.

Weblio’s strength is the volume of data. For any given word, you typically get definitions from multiple dictionaries, example sentences from news articles, and usage notes. The thesaurus feature shows related words and synonyms.

Weblio also has a sentence search that finds real-world usage examples from news sources and web pages. This is more useful than Jisho’s Tanaka Corpus examples because the sentences come from authentic contemporary sources.

The interface is busier than Jisho, and the English-language sections are not as refined. But the depth of data makes it valuable for serious learners.

Tanoshii Japanese

Tanoshii Japanese combines dictionary lookup with grammar and vocabulary learning tools. The dictionary shows readings, definitions, pitch accent diagrams, example sentences, and related grammar points.

The unique feature of Tanoshii is the integration of grammar and vocabulary. When you look up a word, the site shows what grammar patterns it commonly appears in. This helps you understand not just what a word means but how it is used structurally.

Tanoshii also has a “words in this sentence” feature. Paste a Japanese sentence, and it breaks down every word with readings and definitions. This is extremely helpful for reading practice.

Monolingual Japanese Dictionaries

As you advance beyond the intermediate level, monolingual (Japanese-Japanese) dictionaries become more useful than bilingual ones. They provide more precise definitions, better explanations of nuance, and force you to think in Japanese rather than translating through English.

Goo Jisho

Goo Jisho is one of the most popular free monolingual dictionaries. It uses the Kojien dictionary database, which is one of the most authoritative Japanese dictionaries. Definitions are thorough and include usage examples.

Goo Jisho is entirely in Japanese. The interface is straightforward, but you need hiragana input to search. It supports both key word search and 後方一致 (backward matching) for compound searches.

Kotobank

Kotobank is an aggregator that searches across multiple dictionaries simultaneously, including the Daijirin, Daijisen, and other major Japanese dictionaries. For any search, you get multiple definitions side by side, which helps you understand the full range of a word’s meaning.

Kotobank also includes encyclopedia entries,人名辞典 (biographical dictionaries), and 百科事典 (encyclopedia) results from the Britannica Japan database. This makes it useful beyond vocabulary lookup — it is a genuine research tool.

Sanseido Dictionary

Sanseido’s online dictionary is the digital version of the popular Sanseido paper dictionaries. It includes the Super Daijirin and other Sanseido reference works.

The Sanseido online dictionary has a clean interface and authoritative definitions. Some features require a subscription, but basic lookup is free.

Kanji-Specific Dictionaries

Kanji Alive

Kanji Alive is a free interactive kanji dictionary. It covers all Jōyō kanji with stroke order animations, readings, compounds, and etymology.

The standout feature is the stroke order animations. Each kanji is drawn in real time, with the ability to slow down the animation. This is more useful than static stroke order diagrams for learning proper writing technique.

Kanji Alive also includes etymological breakdowns showing how kanji evolved historically. This helps with memorization through understanding the character’s origin.

Kanji Database Project

This site provides detailed information about every Jōyō kanji, including frequency rankings, radical breakdowns, and compound lists organized by reading.

It is especially useful for finding which kanji share the same phonetic component, which helps with learning On’yomi (Chinese readings). Our guide on onyomi vs kunyomi explains why phonetic component recognition accelerates kanji learning.

Mobile Apps

Shirabe Jisho (iOS)

Shirabe Jisho is widely considered the best Japanese dictionary app for iOS. It combines dictionary lookup with study tools including flashcards, quizzes, and SRS review.

Features include handwriting recognition for kanji lookup, pitch accent diagrams for thousands of words, example sentences, radical search, and the ability to create custom word lists. The app downloads its database locally, so it works offline.

The flashcard system integrates with Anki, letting you export words to your Anki decks. The SRS review adapts to your performance.

Akebi (Android)

Akebi is the leading free Japanese dictionary for Android. It includes handwriting recognition, radical search, example sentences, and detailed kanji information including stroke order.

Akebi also supports text file analysis. You can open a Japanese text file in the app, and it will provide dictionary lookups for every word. This turns any digital text into a study resource.

Takoboto (Android)

Takoboto is another excellent Android dictionary. It integrates with offline data, supports multiple dictionary databases, and includes grammar dictionary lookup alongside word lookup.

The grammar dictionary is a standout feature. Takoboto includes hundreds of grammar patterns with explanations and examples. This makes it useful not just for vocabulary but for understanding sentence structure.

Browser Extensions for Instant Lookups

Yomichan (Browser Extension)

Yomichan is an indispensable tool for anyone reading Japanese on the web. It creates a pop-up dictionary that activates when you hover over or click on Japanese text.

When you hover over a word, Yomichan shows the reading, definition, pitch accent, frequency, and example sentences. It also presents kanji breakdowns for each character in the word.

Yomichan uses the JMdict and KANJIDIC databases (the same underlying data as Jisho). You can install additional dictionaries for more data. The extension supports Anki integration — with one click, you can create a flashcard from any word you look up.

Yomichan is available for Chrome, Firefox, and other Chromium-based browsers. It is free and open source.

10ten Japanese Reader (Browser Extension)

10ten Japanese Reader (formerly known as Rikaichamp) is a similar pop-up dictionary extension. It shows readings, definitions, and kanji information on hover.

10ten has a cleaner interface than Yomichan and works well out of the box. However, Yomichan has more customization options and better Anki integration. Many serious learners install both and switch between them depending on the task.

Migaku (Browser Extension)

Migaku (formerly Language Learning with Netflix) is a browser extension designed specifically for learning languages from streaming content. It provides subtitled text lookups for Netflix, YouTube, and Amazon Prime.

When watching Japanese content, Migaku shows dual subtitles. You can click any word to see the definition and add it to your review system. It also tracks your known words and highlights unfamiliar vocabulary.

Migaku is not free, but it is one of the most effective tools for learning from anime and dramas. Our learn Japanese from anime guide discusses how to use these tools in your study routine.

Specialty Dictionaries

Pitch Accent Dictionaries

For learners focused on pronunciation, dedicated pitch accent dictionaries are valuable. Online Japanese Accent Dictionary (OJAD) is the best free option. It shows the pitch patterns of words and can analyze entire sentences to predict accent patterns.

OJAD includes a verb conjugation accent search — it shows how the pitch pattern changes when a verb conjugates. This is crucial because verb conjugation affects pitch accent in ways that are not always predictable.

Onomatopoeia Dictionaries

Japanese has thousands of onomatopoeic words (giongo and gitaigo) that are poorly covered in general dictionaries. The Nihongo Master onomatopoeia dictionary and the JFZ Games onomatopoeia list are dedicated resources for these words.

Onomatopoeia are essential for natural Japanese and appear frequently on the JLPT. Our Japanese onomatopoeia guide covers the most common ones in detail.

Business Japanese Dictionaries

For learners preparing for work in Japanese companies, business Japanese dictionaries cover keigo, business idioms, and formal vocabulary. The Weblio business dictionary is a good free option.

Business Japanese overlaps substantially with JLPT N2 and N1 content. Our JLPT N2 study strategies and JLPT N1 preparation guides cover how to prepare for these levels.

How to Use Dictionaries Effectively

Having a good dictionary is only half the battle. You must also use it effectively.

Look Up Words Immediately

When reading Japanese, look up unfamiliar words as soon as you encounter them. With pop-up dictionaries like Yomichan, this takes one second. Delaying lookup means you will have forgotten the context by the time you look it up later.

Read the Example Sentences

The dictionary definition gives you the meaning. The example sentences show you the usage. Always read at least one example sentence for every word you look up.

Note the Pitch Accent

For words you plan to learn actively, note the pitch accent pattern. This prevents you from forming incorrect pronunciation habits that are difficult to correct later.

Check Multiple Sources

For important words (especially grammar function words), check multiple dictionary sources. Bilingual dictionaries sometimes oversimplify. The nuance captured by a monolingual dictionary entry is often more accurate.

Create Flashcards from Lookups

The best learners create Anki cards from the words they encounter in reading. Yomichan’s one-click card creation makes this frictionless. Over time, this builds a personalized vocabulary deck based on your actual reading input.

Which Dictionaries Should You Use?

Here is a recommendation based on your level:

Beginner (N5-N4): Start with Jisho and Yomichan. Jisho is the most user-friendly for simple lookups. Yomichan makes reading web pages practical. Add Akebi or Shirabe Jisho on mobile.

Intermediate (N3): Add Weblio for deeper definitions and sentence searches. Start using Kotobank for monolingual lookup of common words. Install 10ten Japanese Reader as a backup to Yomichan.

Advanced (N2-N1): Transition primarily to monolingual dictionaries (Goo Jisho, Kotobank, Sanseido). Use bilingual dictionaries only as a backup. Install OJAD for pitch accent reference.

For vocabulary building at any level, use our N5 vocabulary and N4 vocabulary pages alongside your dictionary lookups. Test your knowledge with practice tests to see how well you have retained what you looked up.

Conclusion

Japanese dictionaries have evolved far beyond the bulky paper volumes of the past. Modern online dictionaries, mobile apps, and browser extensions provide instant access to readings, definitions, example sentences, pitch accent, and kanji information. The best approach is to layer multiple tools — a general bilingual dictionary for quick reference, a monolingual dictionary for depth, a browser extension for reading, and a mobile app for on-the-go lookup.

The key is to make dictionary use frictionless. When there is no barrier between encountering an unknown word and looking it up, you will actually do it. And consistent lookup, combined with review through SRS, is the foundation of vocabulary acquisition.

Practice Your Skills

Ready to apply what you learned? KanjiTest.Online has everything you need:

• Study — Browse all N5 kanji with readings and examples
• Flashcards — Flip through interactive flashcards
• Vocabulary — Learn essential N5 words
• Practice Tests — Test your knowledge with timed quizzes

For more resource recommendations, read our guides on JLPT preparation resources, how to use Anki for Japanese, and flashcards for kanji.