Grammarix review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Grammarix is a browser-based proofreading tool for students, professionals and other writers who want quick checks of English text. Writers paste text into the site and receive feedback on grammar, spelling, punctuation, word usage, sentence structure and flow. The free checker also highlights possible plagiarism, run-on sentences, passive voice and overused words, with explanations for highlighted issues. It is designed for individual writing tasks rather than a broader editing workflow, and submissions are described as handling approximately 1,800 words at a time.

The checker’s range is its main distinction: Grammarix says it checks against more than 400 grammatical rules, and it can suggest active-voice alternatives and replacements for overused words. Checks are described as running in real time, with no download required. This can suit someone who wants immediate feedback on a draft in a browser, especially when sentence construction and rule-based grammar are the main concerns. Plagiarism flagging is also included, using the service’s internal checking software; it should be treated as a flag for review rather than a substitute for a dedicated originality workflow.

Grammarix is free, with a Free plan covering the listed checking features. Its web-only delivery means there is no browser extension or offline mode, so it is less suited to writers who want editing support embedded in other tools or available without an internet connection. Support is listed through email and documentation. The product is a reasonable fit for solo writers and small-scale needs that call for a quick browser check, but those seeking deeper workflow integrations or human editing should consider alternatives; Grammarix’s homepage links separately to an external paid human proofreading service.

Grammarix pros and cons

• Where it wins
  • Checks grammar, spelling, punctuation and word choice
  • Flags run-ons, passive voice and overused words
  • Covers more than 400 grammatical rules
• Where it doesn't
  • Web-only access requires an internet connection
  • No browser extension or downloadable app
  • Automated checks offer a narrower workflow than human proofreading

Grammarix fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update