Free Online Grammar Checker

Paste any text and get instant, AI-powered corrections for grammar, spelling, and style — each with a plain-English explanation, not just a red underline.

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What it catches

• Grammar mistakes — subject-verb agreement, tense consistency, misplaced modifiers.
• Spelling errors — including words that are spelled correctly but wrong for the context (their/there, affect/effect).
• Punctuation issues — comma splices, missing commas, apostrophe misuse.
• Awkward or unclear phrasing — sentences that are technically correct but hard to read.
• Style inconsistencies — tone shifts, wordiness, passive voice where active would read better.

Why an AI grammar checker instead of a rule-based one

Most free grammar checkers match your text against a fixed list of rules. That works for obvious typos, but it misses anything that requires understanding what you actually meant. Proofread Bot uses an AI language model to read your text in context, the same way a human editor would — so it can flag a sentence that's grammatically fine but confusing, or suggest a clearer way to phrase something, not just point out a broken rule.

Who it's for

Students checking essays, professionals proofreading emails and reports, non-native English speakers double-checking phrasing, and anyone who wants a second pair of eyes on their writing before hitting send.

How it works

1. Paste or type your text into Proofread Bot.
2. The AI analyzes it and flags grammar, spelling, and style issues.
3. You review each suggestion — with an explanation — and apply the ones you want.

Try it free →