Grammar and writing checker
Catches the mechanical mistakes a spellchecker misses, on your own device.
- Runs in your browser — your text is never sent anywhere
- No sign-up, no quotas, free to use as often as you like
How it works
Every online grammar checker sends your writing to a server, which is an odd thing to do with a cover letter, a legal letter or an unpublished manuscript. This one runs in the page. It is also worth saying plainly what kind of checker it is, because that sets what it can find.
What it finds
Mechanical mistakes, reliably: repeated words, spacing around punctuation, a lowercase “i”, “should of” for “should have”, its/it's and your/you're where the surrounding words make it clear, a/an before the wrong sound, unclosed brackets, and a set of commonly misspelled words. Optionally it also flags wordy phrases with shorter alternatives, passive constructions, weak intensifiers, and sentences long enough to lose the reader.
What it cannot find
This matches patterns. It does not understand your sentences, so it cannot catch a wrong tense, an agreement error across a long clause, a misplaced modifier, or a real word used in place of another where the context does not give it away. “Nothing flagged” means no mechanical mistakes were found — not that the writing is correct.
Why not use a model instead
A model that genuinely understands grammar is hundreds of megabytes and would take minutes in a browser, and the good ones run on someone else's servers. A fast, honest rule-based check that never sees your text is a better trade for most writing than a slow one that does.
Style suggestions are suggestions
Passive voice is not an error — it is the right choice when the actor is unknown or unimportant. Treat those flags as prompts to look, not instructions to change.
Grammar and writing checker — questions
Is my writing uploaded?
No. The check runs entirely in your browser.
Will it catch every grammar mistake?
No. It matches patterns, so it finds mechanical errors and misses anything that needs understanding the meaning.
Why does it flag passive voice?
As a prompt, not an error. Passive is often the right choice; the flag just asks you to look.
Does it check spelling?
Only a set of commonly misspelled words. Your browser's own spellchecker covers the rest as you type.