Can this catch every kind of writing mistake?

It's good at catching mechanical errors — misplaced commas, subject-verb mismatches, doubled words — but can miss context-dependent issues, like a sentence that's grammatically correct but doesn't say what you actually meant. A final read-through by a person is still worth doing for anything important.

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Grammar Checker

Check and fix grammar and spelling errors

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English

About Grammar Checker

Checks English text for spelling mistakes, common grammar errors (don't/dont, their/they're, its/it's, "has went", a/an), spacing and capitalization, and fixes the clear ones. Mix-ups such as then/than, effect/affect and less/fewer are listed as suggestions. Anything it is not sure about is listed as a suggestion and left unchanged. Web addresses, e-mail addresses, file names and version numbers are never touched. Your text stays in your browser.

Watch: Grammar Checker in Action

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How to use Grammar Checker

Paste or type your text into the box and click check. The tool scans for common mechanical issues — misspelled words matched against a dictionary of frequent typos, doubled words ("the the"), extra spaces, missing capitalization at the start of sentences and for standalone "I", and repeated punctuation ("!!!" or "??") — and highlights each one it finds with a brief note on what it changed or flagged. Review each flagged issue and accept or ignore it as you see fit; nothing is changed automatically without your review.

When to use it

A quick final pass over an email, a social media post, or a short document before sending or publishing it, specifically to catch the small mechanical slips that are easy to miss when reading your own writing — a typo, a doubled word from editing, a missing capital letter. It's a fast, no-signup check for exactly that category of mistake, not a substitute for careful proofreading of longer or more important documents.

When not to use it

For anything where full grammatical correctness matters — a job application, a formal document, an academic paper — this tool's scope is genuinely narrower than a complete grammar checker; it doesn't catch subject-verb agreement, tense consistency, or sentence structure issues, only the mechanical categories listed above. For that level of review, a human proofreader or a more comprehensive grammar-checking service that actually parses sentence structure is the right tool, not this one.

Tips for best results

Run the check again after making edits based on its first pass — fixing one issue occasionally reveals or creates another nearby (removing a doubled word can shift punctuation spacing, for instance), so a second pass on a longer piece of text catches anything the first pass's fixes introduced. For anything genuinely important — a cover letter, a formal email to someone you don't know well — read it aloud to yourself as a final check after this tool's pass, since reading aloud catches grammatical and flow issues (like subject-verb mismatches) that this tool's mechanical checks don't cover.

Limitations

Spelling correction is based on a dictionary of common misspellings, not a full analysis of every word against a complete dictionary — unusual but correctly spelled words, names, and technical or industry-specific terms may occasionally get flagged, and some legitimate rare typos outside the common-mistake list won't be caught. As covered directly above, full grammar (like "This are a test") isn't detected at all — this is a stated, deliberate scope limit, not an oversight.

Privacy

All checking happens directly in your browser against a built-in set of rules and common-mistake patterns — your text is never sent to any server or external service to be checked, unlike some grammar tools that route your writing through a cloud-based language model.