Free Grammar Checker
Updated September 2026
Check text for ~50 common spelling mistakes, mixed-up words (your/you're, could of/could have), and a few style patterns. Free, runs entirely in your browser — not AI-powered.
Productivity tools should accelerate your work, not slow it down. The Grammar Checker is built for speed and simplicity so you stay in flow.
Check text for ~50 common spelling mistakes, mixed-up words (your/you're, could of/could have), and a few style patterns. Free, runs entirely in your browser — not AI-powered. Results are immediate — no waiting, no loading screens, no account required.
Who uses the Grammar Checker?
- A quick pass to catch common typos (teh, recieve, seperate) before sending an email.
- Catching frequent word mix-ups (your/you're, could of/could have) in casual writing.
- Students doing a fast sanity check on an essay before a more thorough proofread.
Common uses and search terms
The Grammar Checker is frequently used for: grammar checker, spell check, writing tool, grammar check online, free grammar checker, check my grammar, proofreader, spelling and grammar check, correct grammar online, english grammar checker, grammar error checker. Whether you need a quick result or are working through a longer project, the tool handles all common variations without any configuration.
Why use Allio Tools's Grammar Checker?
Everything runs locally in your browser. No data is sent to a server, logged, or stored anywhere. The tool is completely free with no usage limits, no premium tiers, and no account required. Available in 11 languages and optimised for all screen sizes, the Grammar Checker works on desktop, tablet, and mobile with no app download needed.
See also:Pomodoro Timer · Writing Prompt Generator · Readability Analyzer
How the Grammar Checker works
Paste or type your text into the input area.
Click Check Grammar to scan for matches against a built-in list of common misspellings, mix-ups, and wordy phrases.
Read the flagged issues listed below the input, grouped by category (spelling, grammar, capitalization, punctuation, style) with a suggested fix for each.
There's no click-to-fix or "Fix All" — corrections are suggestions to apply manually in your own text.
Tips & tricks
- This tool is rule-based pattern matching against roughly 50 known misspellings and mix-ups — not an AI model — so it will miss grammar errors outside its fixed rule list and won't understand context.
- There's no highlighting inside your text and no "Fix All" — read the issues list below the textarea and edit your original text manually.
- There's no US/UK dialect toggle — the rule list doesn't differentiate spelling conventions.
- Everything runs client-side in your browser; no text is uploaded anywhere, so it's safe for sensitive drafts.
Frequently Asked Questions
Is this an AI grammar checker?
No — despite how it may be described elsewhere, this tool works entirely by matching your text against a fixed list of roughly 50 known misspellings, easily-confused word pairs (your/you're, could of/could have), and a handful of wordy-phrase patterns. There's no AI model, no API call, and no understanding of sentence structure or context.
Can I click on a highlighted error to fix it, or use a "Fix All" button?
No — the checker lists issues below the text box with the found phrase and a suggested replacement, but it doesn't highlight errors inside the textarea itself and there's no click-to-apply or "Fix All" feature. You apply suggestions manually.
Does it detect subject-verb agreement, tense consistency, or passive voice errors?
Not comprehensively — it catches a small, fixed set of grammar mix-ups (like "could of" → "could have" or "their is" → "there is") and a few wordy-phrase style flags ("in order to", "due to the fact that"), but it doesn't parse sentence structure to catch general subject-verb agreement or tense errors, or detect passive voice.
Does the tool let me choose American vs. British English?
No — there's no dialect selector. The rule list is a fixed set of patterns that doesn't distinguish or check for British vs. American spelling variants.
Is my text sent to a server for processing?
No — all checking runs as JavaScript regex matching directly in your browser against the built-in rule list. Nothing is sent anywhere.
Is my data safe when using the Grammar Checker?
Completely safe. The Grammar Checker processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Does the Grammar Checker save my work automatically?
The Grammar Checker operates entirely in your current browser session. Your input is not saved to any server. Use your browser's bookmark or your device's clipboard to preserve results between sessions.
Does the Grammar Checker remember my previous inputs?
By default, the Grammar Checker starts fresh each session. Allio Tools Pro users have session history saved locally in the browser. No input data is transmitted to or stored on any server in either case.
Works with ChatGPT, Claude, Cursor, GitHub Copilot, VS Code, Poe and more — 106+ tools, zero data collection.