How do I check if my sentence is grammatically correct?

Paste it into the sentence checker and click once. The AI checks agreement, tense, word order and structure, then returns either a corrected version with a short explanation, or “Correct as written” if there was nothing wrong.

What sentence errors does it catch?

Everything from word-level slips (agreement, tense, articles) to structural problems: run-on sentences, fragments, dangling modifiers, misplaced clauses and ambiguous pronoun references — the errors that make a sentence technically readable but wrong.

Can it check multiple sentences at once?

Yes — paste a short passage (up to 5,000 characters) and each sentence is checked in the context of its neighbors, which matters for tense consistency and references.

Is the sentence checker free?

Yes — free, instant, and no sign-up required.

Free AI Sentence Checker

Is this sentence correct? Paste it and find out in seconds — with fixes for grammar, run-ons, fragments and awkward structure, plus the reason behind each one.

0 / 10,000 characters

The result will appear here.

Why use this sentence checker?

Verdict + fix + why

Not just a corrected sentence — a one-line explanation of what was wrong (or confirmation it was right).

Structure-level checks

Run-ons, fragments, dangling modifiers and unclear pronoun references — errors word-level checkers miss.

Minimal edits

The checker keeps your wording wherever possible; it fixes the sentence, it doesn't replace it.

Free and instant

Check sentences one at a time or a short passage at once.

How to use the sentence checker

Paste the sentence
One sentence or a short passage — whatever you're unsure about.
Click “Check Sentence”
Get the corrected version — or confirmation it was already right.
Read the “Why”
A one-line explanation tells you what the issue was, so next time you won't need to check.

About this sentence checker

Sometimes you don't need a whole document checked — you need to know whether this one sentence is right. This free sentence checker answers exactly that question: paste the sentence, and get a corrected version (or confirmation it was already correct) plus a one-line explanation of the issue.

It checks the errors that matter at sentence level: subject-verb agreement, tense, article use, word order — and the structural failures spell checkers can't see, like run-ons, fragments and dangling modifiers (“Walking to work, the rain started” — who was walking?).

The explanation line is what makes it a learning tool rather than a crutch: see the same “Why” twice and you've found a pattern in your writing worth fixing for good. For style improvements beyond correctness, hand the checked sentence to the sentence rewriter.

Frequently asked questions

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