Grammar Checker

English Grammar Check analyzes English text in your browser using a WebAssembly grammar engine, detecting spelling, capitalization, punctuation, repeated words, subject-verb agreement, writing style, and readability issues in real time. It supports four dialects — American, British, Australian, and Canadian — and all text processing happens locally, never sent to a server.

Error Types and Their Colors

Each problem category gets a distinct underline color so you can spot the issue type at a glance before clicking:

• Red — spelling: wrong letters or typos like "teh" for "the"
• Dark purple — capitalization: missed sentence-start capitals, proper noun casing
• Orange — punctuation: comma, period, quotation mark issues
• Teal — repeated words: consecutive duplicates like "the the"
• Yellow — writing style: suggestions for more concise or accurate phrasing
• Green — readability and word choice: sentence structure optimization
• Blue — agreement: subject-verb, tense, and related grammar rules

Click any underlined text to see the issue description and correction options. Each suggestion is one of three action types: delete (remove excess content), replace (swap with the correct form), or insert (add missing content at the right place). Clicking applies the correction immediately.

Dialect Differences

What the Checker Won't Catch

The grammar engine focuses on standard English conventions. It will flag technical jargon, brand names, and deliberate non-standard constructions as errors. Intentional comma splices, unconventional capitalization (like brand names written in lowercase), or dialect-specific idioms may also be marked. Treat every suggestion as an option, not a mandate.