Built for full-length articles
This runs the same pattern-based checks as this site's Grammar Checker tool - commonly confused words, doubled words, spacing issues, repeated punctuation, missing capitalization, and overly long sentences - sized for pasting in a complete article rather than a short passage. Everything runs in your browser; nothing you paste is sent anywhere.
Why checking commonly confused words catches real, frequent errors
Mistakes like "would of" instead of "would have," or "your welcome" instead of "you're welcome," are among the most common errors in everyday writing precisely because the incorrect version sounds identical when spoken - a spell-checker alone won't catch them since each individual word is spelled correctly, which is why this tool specifically pattern-matches these known confusable phrase pairs rather than relying on spelling alone.
Why long sentences are flagged as a potential issue
A sentence running past roughly 40 words becomes measurably harder for most readers to follow in one pass, even when it's grammatically correct - flagging these isn't about enforcing a hard rule, but about highlighting places where splitting into two sentences would likely improve clarity and readability for the average reader.
Why this is a first pass, not a complete grammar check
Every check here works through pattern matching against known error signatures, not genuine linguistic parsing of sentence structure and meaning - this catches a meaningful share of common real-world mistakes quickly, but it can't identify subtler grammatical issues (like subject-verb agreement across a complex clause) the way a tool that actually parses sentence grammar would.