Check Portuguese spelling, grammar and punctuation free. Every issue underlined where it happens, with the reason attached.
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Portuguese grammar checker
Portuguese grammar checked with the reason attached
Paste Portuguese and every issue is underlined where it happens, labelled spelling, grammar, punctuation or style, with the reason attached. Portuguese is written in the Latin alphabet, and agreement, crase, accents, pronoun placement 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 Portuguese grammar
Three steps. The third is the one most checkers leave out.
1
Paste or upload the Portuguese
Type, paste or drop in a document. Portuguese is already selected as the language on this page; the menu above the editor also offers the variants described below. 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. Portuguese 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 Portuguese
The parts of Portuguese grammar and spelling where a checker has to know the language, not just the words.
AgreementNouns are masculine or feminine and articles, adjectives and participles agree in gender and number; the plural of -ão nouns is the classic trap (mão, mãos; pão, pães; ação, ações). Verb agreement with a collective or a distant subject is where fluent writers slip.
VerbsPortuguese keeps a personal infinitive and a future subjunctive that Spanish has lost (quando você chegar, se eles quiserem), and the conditional and imperfect are both used for the future-in-the-past. In Brazil the second-person tu forms are largely replaced by você with third-person endings.
Spelling and diacriticsThe acute and circumflex mark stress and vowel quality (avô and avó are different people), the tilde marks nasal vowels (ã, õ), and the cedilha appears only before a, o, u. After the 1990 agreement the trema disappeared and many accents on diphthongs (ideia, heroico) with it.
PunctuationStandard Western punctuation; Brazil writes decimals with a comma and thousands with a point. Dialogue may open with a travessão (long dash) rather than quotation marks.
Capital lettersMonths, days and languages are lower case (janeiro, segunda-feira, português). Titles of works capitalise only the first word and proper nouns.
Common mistakes in Portuguese writing
Five errors Portuguese readers notice at once, and what the checker does with each.
Crase: à or a
The grave accent marks the contraction of the preposition a with the article a: vou à praia, but vou a Lisboa (no article) and vou a pé. Wrong crase is the most-marked error in Brazilian school and civil-service writing.
mas and mais
Mas is but; mais is more. The vowels merge in speech, so the mistake survives reading aloud and only grammar exposes it.
Pronoun placement
European Portuguese places object pronouns after the verb (disse-me); Brazilian writing prefers them before (me disse) except at the start of a sentence, where the standard still asks for the verb first. Written Brazilian often breaks that rule.
Plurals of -ão
There are three patterns: -ãos (mão, mãos), -ães (pão, pães) and -ões (ação, ações), and the word decides. The checker knows the word.
Verb agreement with collective subjects
A maioria dos alunos chegou or chegaram is a live question; a gente takes the third person singular (a gente vai) even though it means we, and a gente vamos is an error in writing.
Formal and informal Portuguese
Brazil uses você in nearly all contexts and o senhor / a senhora for formal address; Portugal keeps tu for close relationships and você or the senhor forms for the rest. The verb agrees with the form chosen, so mixing tu and você inside one text produces visible errors (tu vai, você vais).
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 Portuguese here
1
Students in Brazil and Portugal preparing essays, and Brazilian applicants writing for the ENEM and public-service exams where crase is marked.
2
Businesses answering Brazilian and Portuguese customers, where você against tu and o senhor is a register decision.
3
Learners moving from Spanish to Portuguese, who bring Spanish accents and plurals with them.
Portuguese grammar checker FAQs
Is the Portuguese grammar checker free?
Yes. Check Portuguese 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 Portuguese does it check?
The picker has Portuguese (Brazil) and Portuguese (Portugal). The 1990 Orthographic Agreement unified most spelling (ação, ótimo, ideia without an accent), but the two standards still differ in pronoun placement, in the use of você against tu, and in words like fato/facto. Portuguese is preselected on this page; change the language menu above the editor if the text is a different variant.
Does it correct Portuguese spelling as well as grammar?
Yes, and in Portuguese the two overlap. The 1990 agreement dropped silent consonants in Portugal (acção became ação) and several accents everywhere (voo, para as a verb); anything written to the old rules is now flagged. The crase (à) and the sound-alike pairs mas/mais, há/a, senão/se não remain the everyday errors. 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 Portuguese?
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 Portuguese 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 Portuguese?
That is where the reason attached to each flag earns its keep. Nouns are masculine or feminine and articles, adjectives and participles agree in gender and number; the plural of -ão nouns is the classic trap (mão, mãos; pão, pães; ação, ações). 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 Portuguese, 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.