Check Thai spelling, grammar and punctuation free. Every issue underlined where it happens, with the reason attached.
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Thai grammar checker
Thai grammar checked with the reason attached
Paste Thai and every issue is underlined where it happens, labelled spelling, grammar, punctuation or style, with the reason attached. Thai is written in the Thai script, and no spaces between words, tone marks, particles, classifiers 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 Thai grammar
Three steps. The third is the one most checkers leave out.
1
Paste or upload the Thai
Type, paste or drop in a document. Thai 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. Thai 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 Thai
The parts of Thai grammar and spelling where a checker has to know the language, not just the words.
AgreementThai has no gender, no case, no plural marking and no agreement; nouns take classifiers with numbers (หนังสือสองเล่ม, รถสามคัน) and the word order does the grammatical work. An error is usually the wrong classifier, a misplaced particle or a spoken form in a formal text.
VerbsVerbs do not conjugate. Time and aspect come from particles (จะ, กำลัง, แล้ว, เคย) and adverbs; the serial verb construction (เดินไปซื้อ) is normal and English-style prepositions are not.
Spelling and diacriticsThai writes vowels around the consonant (before, after, above, below) and marks tone with four tone marks combined with three consonant classes, so the tone of a syllable is a calculation, not a single sign. The silent-consonant mark (การันต์) cancels a letter in loanwords (ฟิล์ม).
PunctuationThai does not put spaces between words; a space marks the end of a clause or sentence where other languages use a comma or a full stop. The question mark and full stop are not used in standard prose, and quotation marks are the Latin ones.
Capital lettersNo capital letters and no word spaces, so proper nouns are recognised from context. Names of the king and religious terms use their own vocabulary (ราชาศัพท์).
Common mistakes in Thai writing
Five errors Thai readers notice at once, and what the checker does with each.
ค่ะ or คะ
ค่ะ (falling tone) closes a statement; คะ (high tone) closes a question. คะ at the end of a statement and ค่ะ at the end of a question are both wrong, and both are everywhere online.
ใ or ไ
Only twenty words take the vowel ใ (ใน, ใจ, ใช้, ให้ ...); every other ai sound is written ไ. Thai children learn the twenty by rote.
Sound-alike consonants
ศาสตร์, สัตว์, ษ: the three s letters and the six th letters are chosen by etymology. The word decides, and the checker knows the word.
The wrong tone mark
ไม่ (not, falling) against ไหม (question particle) against ใหม่ (new): the mark and the consonant class together set the tone, and a wrong mark is a different word.
Spoken forms in formal writing
มั้ย for ไหม, ป่ะ for หรือเปล่า, จ้า, งับ: chat Thai. Formal text uses the full forms and the polite particles.
Formal and informal Thai
Politeness is grammatical: the final particles ครับ (men) and ค่ะ / คะ (women) close a polite sentence, the pronouns (ผม, ดิฉัน, คุณ, ท่าน) mark status, and formal writing avoids the spoken particles. ค่ะ at the end of a question, where คะ belongs, is a very common written error.
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 Thai here
1
Students in Thailand writing for school, university and the civil-service exam.
2
Companies writing to Thai customers, where ค่ะ/คะ and the polite particles are noticed at once.
3
Learners who want the tone rule and the classifier explained rather than corrected.
Thai grammar checker FAQs
Is the Thai grammar checker free?
Yes. Check Thai 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 Thai does it check?
Standard written Thai, spelled as the current standard has it. Thai has several letters for the same sound (ส, ศ, ษ for s; ท, ธ, ฑ, ฒ, ถ, ฐ for th) fixed by the word’s Pali, Sanskrit or Khmer origin, and the errors met most are the wrong one of these, a wrong tone mark, the vowel ใ against ไ (only twenty words take ใ), and spoken shortenings in formal text. Thai 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 Thai spelling as well as grammar?
Yes, and in Thai the two overlap. Thai has several letters for the same sound (ส, ศ, ษ for s; ท, ธ, ฑ, ฒ, ถ, ฐ for th) fixed by the word’s Pali, Sanskrit or Khmer origin, and the errors met most are the wrong one of these, a wrong tone mark, the vowel ใ against ไ (only twenty words take ใ), and spoken shortenings in formal text. 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 Thai?
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 Thai 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 Thai?
That is where the reason attached to each flag earns its keep. Thai has no gender, no case, no plural marking and no agreement; nouns take classifiers with numbers (หนังสือสองเล่ม, รถสามคัน) and the word order does the grammatical work. 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 Thai, 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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