Grammar Checker Online
Find doubled words, spacing mistakes, missing capitals and punctuation slips in your text. It runs entirely in your browser — no signup, no installation, and nothing you paste or drop leaves your device.
Findings (text position in order)
Rules triggered
What This Grammar Checker Does — and What It Does Not
This grammar checker works with rules, not with a language model. It scans your text for mechanical mistakes that can be detected reliably: a word repeated twice in a row, two spaces instead of one, a missing space after a comma or a period, duplicated punctuation such as !! or ,, (while ?! and ... are left alone), a space before a punctuation mark, a lowercase sentence start, unbalanced brackets or quotation marks, sentences longer than the limit you set, and a built-in list of common typos for English and German. Every finding shows line and column, a short explanation and, if the fix is unambiguous, a suggestion. Confusion pairs such as das/dass or their/there are deliberately not reported: a rule cannot decide them without understanding the sentence. For a full grammar check, use a service such as LanguageTool.
Was diese Grammatikprüfung leistet — und was nicht
More free tools
What is Grammar Checker?
Grammar Checker is a free online business tool built for freelancers, small teams and operations staff. Find doubled words, spacing mistakes, missing capitals and punctuation slips in your text In practice you paste your text, run the check for doubled words, spacing, capitals and punctuation, and then fix the flagged spots and re-run.
Your figures stay in the tab — no account, no upload and no analytics on what you typed.
How to use Grammar Checker
- Paste your text.
- Run the check for doubled words, spacing, capitals and punctuation.
- Fix the flagged spots and re-run.
Grammar Checker FAQ
Is Grammar Checker free to use?
Yes. Grammar Checker is completely free and needs no account, no trial and no payment details. Every feature on the page is available without limits.
Is my data uploaded anywhere?
No. Grammar Checker runs entirely in your browser, so the text, file or number you enter never leaves your device.
Does Grammar Checker work on a phone or tablet?
Yes. It works in any modern browser on desktop, tablet and phone. There is no app to install and no account to create.
How do I use Grammar Checker?
Paste your text. Run the check for doubled words, spacing, capitals and punctuation. Fix the flagged spots and re-run.