German Grammar Checker with Explanations | Schreibcheck by KasusKnacker

How Schreibcheck works

1
Paste your text

Up to 1,200 characters: an email, a message, a paragraph of homework.
2
Correct or improve

Correct fixes mistakes only and keeps your wording. Improve also suggests more natural German. Pick German, Austrian or Swiss German.
3
Read the why

Every edit is numbered and explained, with a link to the grammar lesson so you can practice the rule.

New Chrome extension

Check your German right where you write it

Writing an email in Gmail or filling in a form? Select the text, click the KasusKnacker icon, and the correction opens in Chrome's side panel. You get the same explanations as in the app.

Works on any page where you can select text.
Copy the corrected text back with one click.
Signs in with your KasusKnacker account and uses the same daily checks.
For Chrome and Microsoft Edge on desktop.

Add to Chrome

Free to install. You need a KasusKnacker account.

KasusKnacker side panel in Chrome with a corrected email and an explanation for each change

A real correction

Four mistakes that people who speak German well still make.

Example

Before

Hallo Frau Weber, ich wohne seit drei Jahre in die Wohnung im zweiten Stock. Gestern die Heizung ist kaputt gegangen. Können Sie bitte einen Techniker schicken? Vielen Dank!

Checking…

After

4 mistakes

Hallo Frau Weber, ich wohne seit drei Jahren¹ in der Wohnung² im zweiten Stock. Gestern ist die Heizung³ kaputtgegangen⁴. Können Sie bitte einen Techniker schicken? Vielen Dank!

1 Dative

~~seit drei Jahre~~ → seit drei Jahren

"seit" always takes the dative. In the dative plural the noun adds -n.
2 Two-way preposition

~~in die Wohnung~~ → in der Wohnung

"wohnen in" answers "where?", so the preposition takes the dative.
3 Word order

~~Gestern die Heizung ist~~ → Gestern ist die Heizung

In a main clause the verb comes second. After "Gestern" the verb moves before the subject.
4 Spelling

~~kaputt gegangen~~ → kaputtgegangen

"kaputtgehen" is one word, so its participle is written as one word too.

Check your own text

Made for the German you actually write

Work and everyday emails

Send the message to your colleague or landlord without second-guessing every article.

Official letters

Check the letter to the Bürgeramt or your insurance before it goes out.

Exam writing practice

Write a telc- or Goethe-style text and see exactly which rules you still miss.

Free to try

Free

1 check a day, with every explanation and lesson link.

Premium PRO

Up to 30 checks a day, plus everything else in KasusKnacker Premium.

Schreibcheck uses AI. It gets most things right but can make mistakes, so read important texts yourself. Explanations are in English or German.

Questions about Schreibcheck

Is Schreibcheck free?

Yes, every account gets one free check a day. With Premium you can check up to 30 texts a day.

How long can my text be?

Up to 1,200 characters per check, about a short email or two paragraphs.

What is the difference between Correct and Improve?

Correct only fixes mistakes and keeps your wording. Improve also suggests more natural phrasing.

Does it know Austrian and Swiss German?

Yes. Choose Germany, Austria or Switzerland before you check, and the correction follows that standard.

Do I need an account?

Yes. Sign up for free in the app, and your checks are saved in your history.

Is there a browser extension?

Yes. The KasusKnacker Schreibcheck extension for Chrome checks text you select on any website and shows the correction in a side panel. It uses your account and your daily checks, and it also runs in Microsoft Edge.

Can the AI be wrong?

Sometimes. Every edit comes with its reason and a link to the rule, so you can check it yourself.

Write it. Check it. Learn the rule.

Your first check today is free.

Open Schreibcheck

Learn Grammar

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Your German, corrected and explained