Free AI Grammar Checker
Fix grammar mistakes, spelling errors, and punctuation instantly with RewriteNext free AI grammar checker. Works on essays, emails, blog posts, reports, and any writing — and unlike Grammarly, your text is never stored or analyzed after processing.
AI Grammar Fixer
Instantly fix grammar, punctuation, and spelling in your text.
What is a free AI grammar checker?
An AI grammar checker automatically detects and corrects grammar mistakes, spelling errors, punctuation problems, and unclear sentence structure in your writing. Unlike basic spell-checkers built into word processors, an AI grammar checker understands context — so it catches errors that simple tools miss, like incorrect verb tense, misused commas, run-on sentences, and subject-verb disagreement. The result is clean, professional writing that reads clearly and communicates your ideas without distraction.
RewriteNext processes your text and returns corrected output in seconds — without storing a single word. This makes it safe for professional emails, academic submissions, confidential reports, and any writing where privacy matters. Your content is yours alone.
See it in action — real grammar corrections
Three common grammar errors fixed instantly by RewriteNext.
The report was due yesterday I stayed up all night to finish it my manager still hasnt reviewed it.
The report was due yesterday. I stayed up all night to finish it, but my manager still has not reviewed it.
The team of engineers are working on a solution that improve the overall system performance.
The team of engineers is working on a solution that improves the overall system performance.
Its a great opportunity, we shouldnt miss it, the deadline is tomorrow.
It is a great opportunity. We should not miss it — the deadline is tomorrow.
How the AI grammar checker works
Copy any text — an email draft, essay paragraph, blog post, or report section — and paste it into the input field above.
Our AI reads every sentence in context, identifies all grammar, spelling, and punctuation errors, and rewrites corrected output instantly.
Review the corrected version, confirm any changes you want to keep, and copy it directly into your document or email.
Grammar errors the checker fixes
RewriteNext detects and corrects all common grammar, spelling, and punctuation errors — not just surface-level typos.
Identifies sentences that run together without proper punctuation and splits them into clear, separate statements.
Detects two independent clauses incorrectly joined by a comma and corrects the punctuation or structure.
Catches mismatches between subjects and verbs — such as "the team are" vs "the team is" — and corrects them.
Fixes missing or incorrect apostrophes in contractions and possessives — "its" vs "it is", "your" vs "you are".
Identifies unintended shifts between past, present, and future tense within a paragraph and makes them consistent.
Corrects misspelled words throughout your text, including homophones and commonly confused words.
Detects incomplete sentences that are missing a subject or verb and rewrites them as complete, clear statements.
Rewrites awkward or ambiguous sentences so they communicate your meaning clearly and read naturally.
Who uses the AI grammar checker
Proofread essays, assignments, and dissertations before submission. Fix grammar errors that lecturers penalize without losing your original argument or voice.
Fix grammar in client emails, proposals, and reports before sending. Safe for confidential content — nothing is stored after processing, unlike Grammarly.
Catch grammar errors in blog posts and articles before publishing. Improve sentence clarity and fix punctuation so your content reads professionally.
Frequently asked questions
Yes. The free plan gives you 500 words per request with no payment details required. Free to start with instant access across all three RewriteNext tools.
No. Your text is processed and immediately discarded. We never log, store, or use your content after each request completes. This makes RewriteNext safe for confidential professional writing, academic submissions, and sensitive personal content — unlike some larger grammar tools that retain user data.
Grammarly stores and analyzes documents you submit. RewriteNext stores nothing after processing. For users handling sensitive content — legal professionals, HR teams, academics, or anyone who values privacy — this is a meaningful difference. RewriteNext is also completely free for 500 words with no account required.
Yes. Students regularly use RewriteNext to proofread essays and assignments before submission. The checker fixes grammar, punctuation, and spelling without changing your arguments or ideas. Always review the corrected output to confirm it accurately reflects your intended meaning.
Yes. The checker fixes grammar errors, spelling mistakes, and punctuation problems — including comma splices, missing apostrophes, run-on sentences, and incorrect use of periods and semicolons.
Yes. Professionals use RewriteNext to proofread client emails, proposals, and internal reports before sending. The privacy-first design means sensitive business content is safe — nothing is retained after processing.
The checker fixes run-on sentences, comma splices, subject-verb agreement errors, apostrophe mistakes, tense inconsistency, spelling errors, sentence fragments, and unclear phrasing. It handles both surface errors and deeper structural issues.
Yes. The grammar checker supports major world languages including English, Spanish, French, German, Portuguese, Hindi, and more. Accuracy is strongest in English.
No. The checker corrects errors without rewriting your voice or style. It fixes what is wrong and leaves the rest exactly as you wrote it. If you want to change tone or phrasing, use the AI Humanizer or Paraphraser instead.
The grammar checker fixes errors — grammar, spelling, and punctuation — without changing your wording. The humanizer fixes robotic AI tone. The paraphraser rewrites content in new words. For the best result on AI-generated text: humanize first, then grammar check before publishing.
What to do next
For the best result on AI-generated content, use all three tools together.
If your text is AI-generated, humanize it first to fix the robotic tone — then run the grammar checker to catch any remaining errors.
Need to reword specific sentences entirely rather than just fix errors? The paraphraser rewrites any passage in new words while keeping your meaning.