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Grammar Checker

Rule-based checks for the mistakes that survive a spell check.

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Found Suggestion Rule

Quick Tool Overview

The Grammar Checker applies around a hundred explicit rules to catch the mistakes made of correctly spelled words — their and there, doubled words across a line break, "a hour", comma splices and wordy phrases. Rule-based means fast, private and predictable.

What it does
Finds grammar and usage mistakes by rule
You give it
An email, article, report or application
You get back
Flagged issues with the rule explained
Best for
Catching mechanical mistakes a spell check misses
Text Tools Free, unlimited use No sign-up Runs in your browser

About the Grammar Checker

The mistakes that survive a spell check are the ones made of correctly spelled words: "their" for "there", "its" for "it's", "a hour", a doubled "the the" across a line break, or a sentence that lost its verb during an edit.

This applies around a hundred rules to find them. Commonly confused word pairs are checked in context. The a/an rule is applied by sound rather than by letter, so "an hour" and "a university" both come out right. Doubled words, missing sentence-final punctuation, comma splices, passive constructions and wordy phrases that have shorter equivalents are all flagged. It is rule-based rather than a language model, which means it is fast, private and honest about what it can see — it will not rewrite your sentence, and it will not pretend to understand it.

Key features of the Grammar Checker

Confused word pairs

Their and there, its and it's, affect and effect, checked in context rather than blindly.

A and an by sound

"An hour" and "a university" both come out right, which letter-based checking gets wrong.

Style rules can be switched off

Passive voice is often correct, so it is a flag you can turn off rather than an error.

Every rule explained

Each flag says which convention it applies, so you can disagree with it knowingly.

Completely private

No language model, no request — the rules run in your browser.

How to use the Grammar Checker

  1. 1

    Paste your draft

    An email, an article, a report or an application.

  2. 2

    Read the flagged issues

    Each one is shown in context with an explanation of the rule.

  3. 3

    Choose which rules to apply

    Style rules such as passive voice can be switched off when they do not apply.

  4. 4

    Fix and re-check

    Edit in place and the flags update as you go.

Frequently asked questions

It applies explicit rules rather than a language model. That makes it fast, completely private and predictable — but it cannot rewrite a clumsy sentence or judge whether a paragraph makes sense, which a model can.

Reviews of the Grammar Checker

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