Check Korean spelling, grammar and punctuation free. Every issue underlined where it happens, with the reason attached.
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Korean grammar checker
Korean grammar checked with the reason attached
Paste Korean and every issue is underlined where it happens, labelled spelling, grammar, punctuation or style, with the reason attached. Korean is written in Hangul, and spacing, particles, speech levels, 되 and 돼 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 Korean grammar
Three steps. The third is the one most checkers leave out.
1
Paste or upload the Korean
Type, paste or drop in a document. Korean 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. Korean 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 Korean
The parts of Korean grammar and spelling where a checker has to know the language, not just the words.
AgreementKorean has no gender, number or agreement; particles (은/는, 이/가, 을/를, 에, 에서) mark the role of each phrase and the verb ends the sentence. The particle changes shape after a vowel or a consonant (책은, 사과는), and the wrong shape or the wrong particle is the grammar error met most.
VerbsVerbs conjugate for tense and for speech level, not for person: 가다, 갑니다, 가요, 간다, 갔어요. The formal 합쇼체 (-습니다), the polite 해요체 (-요) and the plain 해라체 must not mix inside one text without reason, and honorific forms (-시-, 드리다, 계시다) mark respect for the subject or the listener.
Spelling and diacriticsHangul has no diacritics; the spelling question is which final consonant (받침) to write when several sound alike (낫, 낮, 낯, 났 all end in the same sound), and which of the vowel pairs (애/에, 외/왜/웨) the word takes.
PunctuationLatin punctuation with full-width variants in some publishing. Word spacing (띄어쓰기) is part of the spelling rules: particles attach to the noun, spaces separate words, and dependent nouns (것, 수, 때) take a space before them.
Capital lettersNo capital letters. Proper nouns are unmarked.
Common mistakes in Korean writing
Five errors Korean readers notice at once, and what the checker does with each.
되 or 돼
돼 is the contraction of 되어: 안 돼요 (되어요), 됐다 (되었다), but 되고, 되니까, 됩니다. Replace with 하/해 to test: if 해 fits, it is 돼.
안 or 않
안 is an adverb before a verb (안 먹어요); 않 is the verb stem in -지 않다 (먹지 않아요). 않 먹어요 is wrong.
Spacing before dependent nouns
할 수 있다, 먹을 것, 갈 때: 수, 것, 때, 데, 지 (as a noun) take a space. Particles never do (책은, 학교에서).
Mixed speech levels
A message that opens in 합니다 and continues in 해요 for the same reader, or slips into 한다, reads as a draft. Choose the level and keep it.
며칠, 웬, 금세, 오랜만
몇일, 왠 (except in 왠지), 금새, 오랫만 are common and wrong. The checker knows the standard forms.
Formal and informal Korean
The speech level is grammatical. Business and customer writing uses -습니다/-ㅂ니다 or -요, with the honorific -시- for the reader (하십니다, 하세요) and humble forms for oneself (드리다, 말씀드리다). A text that switches between 합니다 and 해 for the same reader is wrong, not casual.
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 Korean here
1
Students and job seekers in Korea, where 자기소개서 and reports are read for spacing and spelling.
2
Companies writing to Korean customers and partners, where the speech level is the message.
3
Learners at TOPIK 3 and above and heritage speakers who want the rule attached to the fix.
Korean grammar checker FAQs
Is the Korean grammar checker free?
Yes. Check Korean 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 Korean does it check?
Standard written Korean, spelled as the current standard has it. The National Institute of Korean Language sets the spelling and spacing rules. Korean 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 Korean spelling as well as grammar?
Yes, and in Korean the two overlap. The National Institute of Korean Language sets the spelling and spacing rules. The errors met most are spacing (할 수 있다 with spaces, 할수있다 without), 되/돼, 안/않, the 받침 in sound-alike words, and 왠/웬, 며칠/몇일 (only 며칠 is correct). 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 Korean?
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 Korean 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 Korean?
That is where the reason attached to each flag earns its keep. Korean has no gender, number or agreement; particles (은/는, 이/가, 을/를, 에, 에서) 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 Korean, 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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