We can think of endless reasons why proofreading is important but top of the list is definitely professionalism and credibility. You’ll never be able to build authority (with either Google or your customers) if your website, newsletters, blog posts, ebooks, or other copy are riddled with typos and grammatical errors. The lack of attention to detail will reflect poorly on your business, leaving people questioning the quality of your products or services.
Of course, proofreading is also key for clear messages, making the content easier to follow and understand, and providing a great user experience.