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Grammar Checker AI

Commas, apostrophes, capitals

Punctuation and grammar checker for commas and apostrophes

Comma splices, missing apostrophes, stray capitals and quotation marks that do not match. Paste your text and get it back with the punctuation and grammar fixed, and a list of what changed.

Check my punctuationCommon grammar mistakes
  • Comma splices
  • Apostrophes
  • Consistent style
Language
Depth
0 / 3,000 words

Corrected text

Paste your text and press Check grammar. The corrected text and the main fixes appear here.

At a glance

This punctuation and grammar checker fixes commas, apostrophes, semicolons, colons, quotation marks, capital letters and the grammar around them in English, German, Japanese, Chinese, Spanish and French. Paste 1 to 3,000 words, choose the language, and get the corrected text with up to 12 main fixes and their rules. Style choices such as the serial comma are kept and made consistent. Checks use purchased credits at 1 credit per word.

Punctuation
Commas, apostrophes, semicolons, colons, quotation marks, capitals
Style choices
Serial comma and quotation mark style kept and made consistent
Languages
English, German, Japanese, Chinese, Spanish and French
Price
1 credit per word, 20-credit minimum; $0.08 to $0.20 per 1,000 words
Text length
1 to 3,000 words per check
Account
Free to sign up; checks use purchased credits

Punctuation the checker fixes

  • 01

    Commas

    Comma splices, missing commas after an opening word such as However, and commas before and, but or so when they join two full sentences.

  • 02

    Apostrophes

    It's and its, let's, possessives such as the client's report, and apostrophes that do not belong in plurals.

  • 03

    Semicolons and colons

    A semicolon between two related sentences, a colon before a list or an explanation, and neither where a comma is enough.

  • 04

    Capitals and quotation marks

    Capitals for days, months, names and sentence starts, and quotation marks that open and close in the same style.

How to check punctuation and grammar

  1. 01

    Paste your text

    Emails, essays, reports or captions, up to 3,000 words at a time.

  2. 02

    Choose the language

    Punctuation rules differ: German clause commas, Spanish ¿ and ¡, French spacing, full-width marks in Chinese and Japanese.

  3. 03

    Review each fix

    The list shows each punctuation fix with its rule, so you can accept it or keep your version.

English punctuation rules the checker applies

Most punctuation fixes in English text come down to a handful of rules:

  • Two full sentences need a full stop, a semicolon, or a comma with and, but or so between them: It was late, so we went home.
  • A comma follows an opening word or clause: However, the client asked for changes.
  • It's means it is; its is possessive: It's clear the team did its best.
  • Let's means let us: Let's meet on Friday.
  • Plurals take no apostrophe: two apples, the 1990s.
  • Days, months and languages take capitals: Friday, October, German.

Punctuation in other languages

Choose the language of your text, because each one has rules of its own:

  • German: a comma before subordinate clauses, including dass and weil clauses and relative clauses.
  • Spanish: questions and exclamations open with ¿ and ¡.
  • French: a space before ; : ! and ?, kept the way your text writes it.
  • Chinese and Japanese: full-width marks such as ，and 。, and 「」 quotation marks in Japanese.

Style choices stay yours

Some punctuation is a choice, not a rule: the serial (Oxford) comma before and in a list, straight or curly quotation marks, US or UK spelling. The checker keeps the choice your text makes and only makes it consistent where the text mixes styles.

More checkers and guides

Punctuation checker FAQ

Does it add or remove the Oxford comma?

Neither, as a rule. It keeps the choice your text already makes. If the text uses the serial comma in some lists and not in others, it makes them consistent with the style used most and lists that as a fix.

Can it fix comma splices?

Yes. When two complete sentences are joined only by a comma, it corrects the punctuation, usually with a full stop, a semicolon or a joining word such as so, and lists the fix with the rule.

Does it check punctuation in other languages?

Yes, in German, Japanese, Chinese, Spanish and French as well as English. Choose the language before checking so the right rules apply, such as German clause commas or Spanish opening marks.

Is the punctuation checker free?

The rules on this page are free to read. Checks use purchased credits at 1 credit per word, at least 20 credits per check; new accounts start with no credits, and packs start at $4.99.

Check your punctuation before you publish

Packs start at $4.99 for 25,000 credits. Signing up is free; checks use purchased credits.

Check my punctuation

Last updated October 23, 2026

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