Having some grammatical errors definitely sends a signal to your customers. If you're a large company, it just indicates sloppiness and lack of respect. But if

Having some grammatical errors definitely sends a signal to your customers. If you're a large company, it just indicates sloppiness and lack of respect. But if you're a very small company, it's not necessarily a negative signal. If I look at a bilingual website for a company I know is run by non-native English speakers, and the English version is error-free, that tells me it was probably translated by outsiders. Possibly the company doesn't even have the capacity to handle Anglophone customers (i.e. no internal staff sufficiently fluent in English to communicate with me), but just put up the English website to send a signal to impress their own-language customers with how "international" they are. On the other hand, if I see some grammatical errors --- enough to be noticeable, but not so many as to entirely obscure the message --- it tells me they probably did it themselves. I.e. somewhere in the organisation there is some guy who speaks good enough English to describe their product. Maybe with a hellacious accent and horrible grammar, but at least I'll be able to communicate with him.