Microsoft Editor is Microsoft’s AI writing assistant, built into Word, Outlook and web browsers, checking spelling, grammar and style where you already write.
Editor goes well beyond the old red squiggles: it gives documents an Editor Score, suggests refinements for clarity, conciseness, formality, vocabulary and inclusive language, and includes a similarity checker in Word that helps writers avoid unintentional plagiarism. Because it is part of the Microsoft ecosystem, there is little extra to install: it appears in Word and Outlook on desktop and the web, and a free extension brings it to text boxes across the web in Edge and Chrome. Basic guidance covers more than 20 languages, with spelling suggestions in over 80, and because it rides on a Microsoft 365 subscription, many professionals already have the premium version without knowing it. For organisations, Editor respects the Microsoft 365 compliance boundary, so document text is processed inside the tenant rather than by an outside add-on, a point that matters to companies with strict data policies. The free browser extension alone upgrades everyday webmail, forms and social posting with the same spelling and grammar engine used in Word.
Basic spelling and grammar checks are free with a Microsoft account in Word for the web, Outlook and the browser extension. The premium refinements are included with Microsoft 365 subscriptions, which start at $9.99 per month or $99.99 per year for Personal, with Family plans covering up to six people.
Anyone who writes in Microsoft Word, Outlook or a browser and wants solid grammar and style help without paying for a separate writing assistant subscription.