Free Korean grammar checker for particles, spacing, and speech levels
Correction
Why it changed
In Wonderglot stories, every reply you send gets this same check, plus one-tap word definitions and voice chat. Practice in a Korean story
Updated 2026-10-26 · Published by Wonderglot (DigitalCarbon Inc). The interactive Korean grammar checker above uses the same correction engine that checks learner replies in Wonderglot Korean stories.
Key takeaway
Korean grammar packs batchim-dependent particles (은/는, 이/가, 을/를, 에/에서), irregular verb stems (ㅂ, ㄷ, 르, ㅎ), and honorific speech levels into compact Hangul blocks where a single syllable changes the grammar. Use the free Korean grammar checker above to see exact Hangul diffs and plain-English notes—or open Wonderglot (free messages every day + permanently free word lookups; Plus at US$8.99/month or US$59.99/year) for daily Korean reading practice and Korean conversation practice inside ongoing stories.
Why Korean 맞춤법 (spellcheckers) are hard for English-speaking learners to use
Native Korean 맞춤법 검사기 tools are designed for native writers checking complex spacing (띄어쓰기) in essays, and they output terse grammatical explanations entirely in Korean linguistic terminology. Meanwhile, when a TOPIK I or TOPIK II learner writes “친구에 만났어요” or mixes up “안 되요” and “안 돼요”, they need a clear note in English explaining which particle or vowel contraction rule applies.
The Korean grammar checker at the top of this page bridges that gap: it evaluates Hangul spelling, particle selection, irregular verb stems, and tense consistency, then shows a side-by-side diff with a concise English explanation of each edit.
Mastering 에 vs. 에서, irregular conjugations, and Korean speech levels
Three areas trip up almost every English speaker learning Korean. First is particle choice: knowing when a verb requires 을/를 (like 만나다, 좋아하다, 타다 in many contexts) versus 이/가 (with 되다, 아니다, 있다, 없다, 필요하다) or 에 vs. 에서. Second is irregular verb conjugation when attaching polite -아요/-어요 or modifier endings like -(으)ㄴ and -(으)ㄹ.
Third is speech level consistency—keeping polite 해요체, formal 합쇼체, or casual 반말 consistent with the social relationship and remembering honorific verbs (드시다, 주무시다, 말씀하시다, 드리다) when speaking about or to someone older.
| Korean Grammar Point | Learner Input | Corrected Hangul & Rule |
|---|---|---|
| 에 vs. 에서 for static location vs. action place Source: wonderglot.com/ko | 도서관에 한국어를 공부해요. | 도서관에서 한국어를 공부해요. (Use 에서 for the location where an action like studying takes place; use 에 for destination or simple existence with 있다/없다.) |
| Vowel harmony & irregular stems (-아요 / -어요) | 음악을 듣어요. / 노래를 부르어요. | 음악을 들어요. / 노래를 불러요. (ㄷ-irregular 듣다 changes ㄷ to ㄹ before a vowel → 들어요; 르-irregular 부르다 doubles ㄹ → 불러요.) |
| Batchim particle pairing (은/는, 이/가, 을/를, 과/와) | 시간을 없어요. / 친구과 같이 갔어요. | 시간이 없어요. / 친구와 같이 갔어요. (없다/있다 take 이/가 rather than 을/를; after a vowel-final noun like 친구, use 와 instead of 과.) |
| Common Hangul vowel & liaison spellings (ㅐ/ㅔ, 되/돼) | 오늘 안되요. / 맛있게 먹어새요. | 오늘 안 돼요. / 맛있게 드세요. (At the end of a sentence, 되 + 어요 contracts to 돼요; for elders or polite requests to eat, use honorific 드세요.) |
| Tense markers with time adverbs (어제, 내일) | 어제 영화를 보러 가요. | 어제 영화를 보러 갔어요. (Past time words like 어제 require the past tense suffix -았/었- → 갔어요.) |
Practicing Korean grammar naturally inside ongoing stories
Checking a sentence on its own helps you spot the pattern, and practicing inside an ongoing Seoul drama or mystery makes those endings automatic. When you use Wonderglot for Korean reading practice and Korean conversation practice, you can tap any conjugated Hangul word to see its base stem and particle breakdown, and every reply you send gets this exact grammar check beneath your message.
Every free Wonderglot account includes free messages every day with Korean grammar feedback, writing help, and permanently free dictionary lookups, and Wonderglot Plus is US$8.99/month or US$59.99/year.
Common questions
- What Korean grammar mistakes does this checker catch?
- It catches particle errors (은/는, 이/가, 을/를, 에/에서, 에게/한테/께), irregular verb and adjective conjugations (ㅂ, ㄷ, 르, ㅅ, ㅎ), tense mismatches, honorific slips, and common Hangul spelling errors such as 되 vs. 돼 and ㅐ vs. ㅔ.
- Does it support both polite 해요체 and casual 반말?
- Yes. The checker respects the speech level of your sentence—whether casual 반말, polite 해요체, or formal 합쇼체—and only corrects definite grammar, particle, or spelling errors.
- Can I get this Korean grammar check while chatting with AI characters?
- Yes. On /ko in Wonderglot, every Korean reply you type or speak into the microphone can show this same word-level diff and English explanation while the story continues.
- Is Wonderglot’s Korean grammar checker free?
- Yes. Checking sentences on this page is free without an account, and a free Wonderglot account includes free messages every day with all Korean tools unlocked plus permanently free word lookups. Plus is US$8.99/month or US$59.99/year.
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