Grammar check with AI online: free

Check grammar for free

Grammar fits, but is the text conspicuous?

Spot machine-sounding passages before you submit.

Grammar check with AI: check your text instantly online with our AI for grammar, sentence structure and punctuation, free of charge, in English and German. For a flawless result, a professional proofreader takes over from €1.90 per page.

Local AI, hosted in Germany: your data is encrypted & secure.

Free AI grammar check

Paste your text and have it checked straight away: finds grammar, sentence structure and punctuation errors.

24 / 2,000 characters
5 corrections marked
Because of the rain, we cancelled the match, and the children really were sad.
Your text went through an AI tool. So that nobody asks questions at university, the AI check shows you how strongly it resembles typical AI texts: Check for AI now →

This grammar check runs on local AI language models that we host in Karlsruhe, Germany: your input stays encrypted and is not passed on to third parties.

Over 70 billion sources Used by over 20 universities Result in about 3 minutes!
Drop your file here or click
PDF, DOCX, TXT, ODT, RTF · Max. 100 MB

Your upload goes directly from your browser, in line with the GDPR: SSL-encrypted and only to servers in Germany. We delete your file automatically and permanently after 7 days.

Secure & GDPR-compliant

We guarantee the highest level of data security: your content is processed only on our own servers in Germany and is never passed on to external third parties.

  • GDPR-compliant
    Data protection under German law.
  • Local AI servers in Karlsruhe, Germany
    No data transfer abroad.
  • SSL-encrypted transfer
    Encrypted from your browser to the AI server.
  • Deleted after 7 days at the latest
    According to the provider, uploads are deleted no later than 7 days after the order is completed.
Max. 3 % error rate
24/7 · 365 days
GDPR · servers in Germany
Professional proofreaders · academics

Four levels of the grammar check

Our proofreaders check your text on every linguistic level, more precisely than any AI.

Spelling

Typos, hyphenated and compound spellings, capitalisation and the current spelling rules (Duden for German).

Grammar

The AI checks sentence structure, case, tense and agreement, so everything beyond pure spelling.

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Punctuation

Punctuation with commas, hyphens and apostrophes, checked against the applicable rules.

Style & expression

Repeated words, clumsy phrasing and unnecessary filler words disappear.

Why a professional grammar check instead of AI?

AI tools such as ChatGPT, DeepL Write or the Duden online check have become strong in recent years, but they still make plenty of mistakes. In our tool comparison even the best AI systems found only 80 to 85 % of the errors. For academic texts such as your bachelor's or master's thesis, that is not enough.

Our experts at corrected.eu keep the error rate to a maximum of 3 %. Beyond pure spelling, they analyse levels that AI often overlooks: style, expression, consistency and semantic coherence.

How the grammar check works

1. Upload your file. Upload your text as .docx, .pdf, .odt or .rtf. You can order straight away, and no registration is needed.

2. Choose your delivery time. Choose Standard (5 days), Express 48 h or Express 24 h. We also process your file at weekends and on public holidays.

3. A proofreader takes over. A specialist proofreader with at least 7 years of experience checks your text manually: it is not a pure AI correction.

4. Receive your corrected text. You receive a Word file with track changes switched on, so you can accept or reject each correction individually.

Which texts is the grammar check suitable for?

We proofread texts in English and German: from bachelor's theses, term papers and dissertations to job applications, novels and professional documents. Both UK and US English are possible.

What does a professional grammar check cost?

Our professional grammar check costs from €1.90 per standard page (1,800 characters including spaces). You will find more information on how pages are counted on our page on standard pages. The final prices depend on the delivery time (5 days / 48 h / 24 h) and the depth of correction you want: you will find all prices on our price page.

Ready for flawless work?

Upload your text, have it checked straight away and receive your professional grammar check in 24 h.

Upload file now
What our customers say View all reviews →

Helpful combo scan

„Helpful combo scan. I ordered the plagiarism + AI scan and was able to correct several citations, and on the repeat scan the result came out at 0 %.“

Silas, customer review (source: Trustami)

Accurate results from the plagiarism and AI scan

„I have absolutely nothing to complain about. The results are satisfactory and completely comprehensible. Both the plagiarism and the AI scan gave accurate results. Although a technical error occurred during my second scan, I was helped promptly, even on a Saturday. All in all I am very satisfied and can warmly recommend the service!“

Charlotte, customer review (source: Trustami)

Combo scan in 2 minutes

„The combo scan arrived by email in 2 minutes, great!“

J., customer review (source: Trustami)

Frequently asked questions about the grammar check

How does a professional grammar check differ from an AI?

Automatic AI checkers miss 15 to 20 % of errors and often make things worse. Experienced proofreaders keep the error rate under 3 % and also analyse style, expression and semantics. You can see the detailed comparison in our grammar check test.

What does a grammar check cost per page?

Costs start at €1.90 per standard page (1,800 characters). Express 48 h costs €2.90 and Express 24 h costs €4.90. You will find the full price list and packages in the shop.

How quickly do I get my text back?

Choose between Standard (5 days), Express 48 h or Express 24 h. The delivery time starts immediately after the order, around the clock, including weekends and public holidays.

Which file formats are accepted?

For proofreading, you upload a PDF or DOCX of up to 100 MB. Export a LaTeX file beforehand as a compiled PDF. With DOCX, you get the text back with track changes, so you can accept or reject each correction individually.

Is the grammar check suitable for bachelor's and master's theses?

Yes. Our experts specialise in academic writing and have proofread bachelor's, master's and diploma theses as well as dissertations, term papers and seminar papers. You will find more information on the bachelor's thesis page.

Do I need an account to order?

No. You order straight after the upload, with no registration or login. Your data is stored on servers in Germany in line with the GDPR.

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