Check Czech spelling, grammar and punctuation free. Every issue underlined where it happens, with the reason attached.
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Czech grammar checker
Czech grammar checked with the reason attached
Paste Czech and every issue is underlined where it happens, labelled spelling, grammar, punctuation or style, with the reason attached. Czech is written in the Latin alphabet, and seven cases, i/y after hard and soft consonants, commas 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 Czech grammar
Three steps. The third is the one most checkers leave out.
1
Paste or upload the Czech
Type, paste or drop in a document. Czech 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. Czech 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 Czech
The parts of Czech grammar and spelling where a checker has to know the language, not just the words.
AgreementSeven cases, three genders with an animate/inanimate split in the masculine, and adjectives that agree with all of it: dobrý muž, dobrá žena, dobré dítě, dobří muži. The plural past tense agrees in gender too (muži byli, ženy byly, děti byly).
VerbsAspect pairs (dělat/udělat) carry completion, and the past tense is a participle plus an auxiliary in the first and second person (dělal jsem). Standard written Czech (spisovná čeština) differs noticeably from spoken Common Czech, so ending choices such as dobrý against dobrej are register errors in writing.
Spelling and diacriticsThe háček (č, š, ž, ř, ě, ň) and the length mark (á, é, í, ó, ú, ů, ý) are part of every word; ú at the start of a word and ů inside it are the same sound with different spellings, and the checker flags the wrong one.
PunctuationA comma precedes every subordinate clause and separates main clauses joined by ale, avšak or nothing; no comma before a in a simple list. Quotation marks open low („takto“). Decimals take a comma.
Capital lettersDays, months, languages and nationality adjectives are lower case (pondělí, leden, český); nationality nouns are capitalised (Čech, Češka). Vy, Váš are capitalised in letters as a courtesy.
Common mistakes in Czech writing
Five errors Czech readers notice at once, and what the checker does with each.
i or y after the ambiguous consonants
Být (to be) but bít (to beat); mýt (to wash) but mít (to have). After b, l, m, p, s, v, z the spelling follows the listed exception words; after hard and soft consonants it is fixed.
mě and mně
Mě is the accusative and genitive (vidí mě), mně the dative and locative (dal mně, o mně). Pronounced identically.
Missing comma before že, který, aby
Vím, že přijde. Muž, který tu bydlí. Czech commas follow the clause structure, and this one is never optional.
Common Czech endings in formal text
Dobrej, velkej, s tím novým autem is speech; dobrý, velký, s tím novým autem is writing. The checker flags the colloquial ending where the rest of the text is formal.
Verb agreement in the plural past tense
Muži přišli, ženy přišly, děti přišly, and a mixed group takes -i. The ending changes with the gender of the subject.
Formal and informal Czech
Ty and vy: vy takes the plural verb (vy jste, můžete) and is the default with strangers, customers and in all official writing; the capital Vy in correspondence signals respect. Tykání is offered, not assumed.
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 Czech here
1
Students in the Czech Republic and Czechs who write mainly in English at work.
2
Businesses writing to Czech customers and offices, where Vy and the commas are expected.
3
Learners at B1 and above who want the case and the i/y rule explained.
Czech grammar checker FAQs
Is the Czech grammar checker free?
Yes. Check Czech 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 Czech does it check?
Standard written Czech, spelled as the current standard has it. The i/y choice after b, f, l, m, p, s, v, z (the vyjmenovaná slova learned at school), mě against mně, and s against z in prefixes (sbírat, zpívat) are the errors Czech speakers themselves look up. Czech 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 Czech spelling as well as grammar?
Yes, and in Czech the two overlap. The i/y choice after b, f, l, m, p, s, v, z (the vyjmenovaná slova learned at school), mě against mně, and s against z in prefixes (sbírat, zpívat) are the errors Czech speakers themselves look up. 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 Czech?
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 Czech 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 Czech?
That is where the reason attached to each flag earns its keep. Seven cases, three genders with an animate/inanimate split in the masculine, and adjectives that agree with all of it: dobrý muž, dobrá žena, dobré dítě, dobří muži. 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 Czech, 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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