Check Japanese spelling, grammar and punctuation free. Every issue underlined where it happens, with the reason attached.
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Japanese grammar checker
Japanese grammar checked with the reason attached
Paste Japanese and every issue is underlined where it happens, labelled spelling, grammar, punctuation or style, with the reason attached. Japanese is written in kanji, hiragana and katakana, and particles, keigo, okurigana, kanji conversion errors are what a checker has to get right in it. This one shows the rule each time, not just the change, so you can accept the fix, ignore it, or learn from it.
How to check Japanese grammar
Three steps. The third is the one most checkers leave out.
1
Paste or upload the Japanese
Type, paste or drop in a document. Japanese is already selected as the language on this page. If the text turns out to be something else, the detector says so and you can change it.
2
Read the flags
Every flag is underlined in the text and listed beside it. Spelling and grammar flags are errors; punctuation and style flags are judgements, and the label tells you which is which before you decide.
3
Accept, ignore or read why
Click a flag to see the fix and the rule behind it, then accept it or ignore it. Japanese has rules that speech does not reveal, and the reason is there so the same error is not made twice.
What the checker looks at in Japanese
The parts of Japanese grammar and spelling where a checker has to know the language, not just the words.
AgreementJapanese has no gender, number or agreement; the particles (は, が, を, に, で, へ, の) mark the role of each phrase and the verb ends the sentence. Most grammar errors are a wrong particle (は against が, に against で) or a missing one.
VerbsVerbs conjugate for tense, polarity and politeness but not for person: 書く, 書きます, 書いた, 書かない. The polite -ます form and the plain form must not mix inside one text (the です・ます against だ・である distinction), and keigo adds respectful and humble verb forms (いらっしゃる, 伺う) that are grammatical, not decorative.
Spelling and diacriticsThe script itself is the spelling: the wrong kanji from a conversion candidate (以外 for 意外, 聞く for 効く), the wrong okurigana (the kana that complete a kanji word: 行なう against 行う, 受け付け against 受付), and the small kana (っ, ゃ, ゅ, ょ) written full size are the errors typing produces.
PunctuationThe Japanese full stop 。 and comma 、, full-width brackets and the corner brackets 「」 for quotation. Text is written without spaces, and a question in polite writing ends in か。 rather than a question mark, although ？ is common informally.
Capital lettersNo capital letters. Emphasis and proper nouns are carried by kanji and katakana.
Common mistakes in Japanese writing
Five errors Japanese readers notice at once, and what the checker does with each.
The wrong kanji from conversion
意外 (unexpected) against 以外 (other than), 効く (to be effective) against 聞く (to hear), 保証 against 保障 against 補償. The reading is the same; the meaning is not.
は or が, に or で
は marks the topic, が the subject that carries new information; に the point of arrival or existence, で the place of action. 学校に勉強する is wrong; 学校で勉強する is right.
Mixed politeness levels
A text in です・ます that drops into plain だ for one sentence reads as a slip. Choose the level and keep it, and keep keigo consistent about who is respected and who is humbled.
Okurigana
行う (not 行なう), 受付 as a noun but 受け付ける as a verb, 申し込み against 申込 in form headings: the official guidelines set which kana follow the kanji.
ら抜き and い抜き
食べられる, 来られる, 見られる are the standard potential forms; 食べれる, 来れる, 見れる are speech, and 見てる for 見ている belongs to chat.
Formal and informal Japanese
The whole verb system shifts with the reader: plain form for notes and to close friends, です・ます for most writing, keigo (尊敬語 and 謙譲語) for customers, superiors and business correspondence. Mixing levels inside one text, or using a respectful form about oneself (ご覧になりました for 拝見しました), is the error that matters most.
The checker flags a mixed register as style rather than as an error, so the decision stays yours. If a whole text needs to move from one register to the other, the tone changer rewrites it in one pass.
Who checks Japanese here
1
Students and job seekers in Japan, where an entry-sheet or thesis with a keigo slip is judged on it.
2
Companies writing to Japanese customers and partners, where the level of politeness is the content.
3
Learners at N3 and above who want the particle and the keigo explained rather than silently fixed.
Japanese grammar checker FAQs
Is the Japanese grammar checker free?
Yes. Check Japanese without an account, within the per-check and daily word allowances shown beside the editor. Signing in raises them, and Pro removes the guest limits and the ads. The pricing page lists what each plan includes.
Which Japanese does it check?
Standard written Japanese, spelled as the current standard has it. Beyond conversion errors, the checker flags ら抜き言葉 (食べれる for 食べられる) in formal text, the confusion of ずつ and づつ, じ and ぢ, the particle は written as わ, and long-vowel marks in katakana loanwords (コンピューター against コンピュータ, both accepted in different style guides). Japanese is preselected on this page; the language menu above the editor changes it if the text turns out to be something else.
Does it correct Japanese spelling as well as grammar?
Yes, and in Japanese the two overlap. Beyond conversion errors, the checker flags ら抜き言葉 (食べれる for 食べられる) in formal text, the confusion of ずつ and づつ, じ and ぢ, the particle は written as わ, and long-vowel marks in katakana loanwords (コンピューター against コンピュータ, both accepted in different style guides). Each of these is underlined where it happens, labelled spelling or grammar, with the standard form and the rule beside it.
Will it rewrite my Japanese?
Not unless you ask it to. A check corrects what is wrong and leaves your sentences as you wrote them; every change is a separate flag you accept or ignore. The Improve and Rewrite passes, which do change wording, are separate buttons, and the paraphraser is a separate tool.
Can I check a whole Japanese document?
Yes. Paste the text or drop in a .docx, .pdf or .txt file; the document is checked paragraph by paragraph and the corrected version can be copied or exported. Long documents are checked within the per-check allowance and continue as you scroll.
Is it useful if I am learning Japanese?
That is where the reason attached to each flag earns its keep. Japanese has no gender, number or agreement; the particles (は, が, を, に, で, へ, の) mark the role of each phrase and the verb ends the sentence. A learner sees which rule was broken, not just the corrected word, and can accept the fix or read why it was raised before deciding.
After the check
Translate the corrected Japanese, change its tone, or shorten it. One plan covers every tool.
Each page opens the checker with that language already selected and explains what it looks for in it. The picker above the editor covers more than seventy languages in all.
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