Japanese Grammar Checker

Paste the Japanese you wrote. We'll correct it and explain why, particle by particle.

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How the grammar checker works

Paste a sentence you wrote in Japanese and the checker compares it against the rule it should be following. You get the corrected sentence with the changed characters highlighted, a short explanation of every fix, and a link to the grammar page that covers that rule in full.

Corrections and suggestions are kept separate on purpose. Corrections are real mistakes. Suggestions are sentences that are already correct but that a native speaker would phrase differently, so you can tell at a glance which is which.

Mistakes this checker looks for

These are the errors that show up most often in beginner and intermediate Japanese writing. Each one has a full explanation on its own page.

は vs が

The most common mistake in beginner writing. は marks the topic, が marks the subject.

に vs で

に marks a destination or point in time. で marks where an action takes place.

を with the wrong verb

Intransitive verbs do not take を. Check the verb before you mark the object.

Mixing masu form and plain form

Switching register mid-paragraph is grammatical but reads as careless.

na adjectives treated as i adjectives

綺麗い is not a word. na adjectives conjugate through です, not through い.

te form built from the wrong group

Group 1 verbs change stem before て. Group 2 verbs just drop る.

Transitive and intransitive pairs

開ける and 開く look alike and take different particles. Learners mix them constantly.

Negative forms

ません, ない and なかった each belong to a different register and tense.

Word order

Japanese is flexible, but the verb goes last and modifiers come before what they modify.

Checking, or reading?

This tool is for Japanese you wrote. If you want to understand a sentence someone else wrote, from a book, a song or the news, the Japanese sentence analyzer breaks it down word by word instead. Starting from English? The English to Japanese tool shows you how to say it, then explains the result.

Learn these patterns in full lessons

Use the grammar links for quick reference, then use these lessons when you want the same patterns explained in longer examples.