In a webmaster hangout video on YouTube, Google’s John Mueller said that he is not aware of Google algorithms that demote websites for using bad grammar:
“It is more a matter of how [your content] is received from a user point of view. If you are a banking web site and you have terrible English on it, then I assume users will lose trust in your web site. But for other things, it is the way the web just comes. Especially user generated content, you can’t fix their grammar, you probably could but it is impractical.
I don’t know if any of our algorithms specifically look for the grammar and say this web site uses English in a bad way, we will demote it. It is possible but it feels really kind of niche. We can find better ways of finding lower quality content than just checking the grammar.
Something like grammar is really hard to do across the internet, where there are so many different languages and so many variations of languages. We can’t possibly check Swiss German websites for grammar.”
You can view the video here:
Although Google does not care about grammar, bad grammar is an issue for Bing.
How to check your web pages for spelling mistakes
Among many other things, the website audit tool in SEOprofiler also checks your pages for spelling mistakes. You can create your SEOprofiler account here: