Check Finnish spelling, grammar and punctuation free. Every issue underlined where it happens, with the reason attached.
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Finnish grammar checker
Finnish grammar checked with the reason attached
Paste Finnish and every issue is underlined where it happens, labelled spelling, grammar, punctuation or style, with the reason attached. Finnish is written in the Latin alphabet, and fifteen cases, vowel harmony, compounds, the yhdyssana rule 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 Finnish grammar
Three steps. The third is the one most checkers leave out.
1
Paste or upload the Finnish
Type, paste or drop in a document. Finnish 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. Finnish 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 Finnish
The parts of Finnish grammar and spelling where a checker has to know the language, not just the words.
AgreementFinnish has no gender and no articles, but fifteen cases, and adjectives agree with the noun in case and number: suuressa talossa, suurissa taloissa. Consonant gradation (katu, kadun; kukka, kukan) changes the stem as the case changes, which is where most errors sit.
VerbsVerbs conjugate for person and the subject pronoun may be dropped in the first and second person (menen, not minä menen, in formal writing). The object case (partitive against accusative: luen kirjaa, luin kirjan) encodes whether the action is complete, and it is the hardest rule for learners.
Spelling and diacriticsä and ö are separate letters, not accented vowels, and vowel harmony decides which suffix vowels appear (talossa, kylässä). Writing a for ä changes the word.
PunctuationA comma separates main clauses and precedes every subordinate clause (Tiedän, että hän tulee). Decimals take a comma; quotation marks are ” ”.
Capital lettersDays, months, languages and nationalities are lower case (maanantai, tammikuu, suomi, suomalainen). The formal Te may be capitalised in letters.
Common mistakes in Finnish writing
Five errors Finnish readers notice at once, and what the checker does with each.
Yhdyssanat: compounds split into two words
Puhelinnumero, not puhelin numero; asiakaspalvelu, not asiakas palvelu. A split compound reads as an error to every Finnish reader.
Partitive or accusative object
Luin kirjaa (I was reading a book) against luin kirjan (I read the book). The object case encodes completion, and a negative sentence always takes the partitive.
Missing possessive suffix
Hänen autonsa, not hänen auto. The suffix is compulsory in standard Finnish with the third person and in the written first and second person.
Consonant gradation in the wrong direction
Kauppa, kaupan; kukka, kukan; matto, maton. The strong grade appears in the nominative and partitive, the weak grade before a closed syllable.
Comma before että and joka
Every subordinate clause takes a comma in Finnish: Sanoin, että tulen. Leaving it out is one of the most common punctuation errors in Finnish writing.
Formal and informal Finnish
Sinä against Te: teitittely (using Te) survives in formal service situations and with the elderly, and takes the plural verb form. Most written Finnish today, including business email, uses sinä.
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 Finnish here
1
Students in Finland writing essays and theses, where the yhdyssana and comma rules are still marked.
2
Immigrants preparing for the YKI test who want the case explained rather than swapped.
3
Companies writing to Finnish customers in a language few foreigners write confidently.
Finnish grammar checker FAQs
Is the Finnish grammar checker free?
Yes. Check Finnish 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 Finnish does it check?
Standard written Finnish, spelled as the current standard has it. Compounds are written together (yhdyssanavirhe, the error of splitting them, is the best-known Finnish spelling error), doubled consonants and vowels are meaningful (tuli, tuuli, tulli), and the third-person possessive suffix (hänen kirjansa) is dropped in careless writing. Finnish 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 Finnish spelling as well as grammar?
Yes, and in Finnish the two overlap. Compounds are written together (yhdyssanavirhe, the error of splitting them, is the best-known Finnish spelling error), doubled consonants and vowels are meaningful (tuli, tuuli, tulli), and the third-person possessive suffix (hänen kirjansa) is dropped in careless writing. 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 Finnish?
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 Finnish 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 Finnish?
That is where the reason attached to each flag earns its keep. Finnish has no gender and no articles, but fifteen cases, and adjectives agree with the noun in case and number: suuressa talossa, suurissa taloissa. 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 Finnish, 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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