The short answer is “log in to” is correct, and “log into” is considered incorrect.

Here is a more detailed explanation of why “log in to” is correct and “log into” is considered incorrect:

“Log in” is a phrasal verb that means to connect to an app, device, or system. For example, you log in to Facebook to check your profile, or you log in to your computer. What is a phrasal verb? Well, a verb is a doing/ action word (such as throw, catch, read). Specifically, a phrasal verb means when two or more separate words are combined to describe an action. So “Log in” is two separate words that, when combined, have a specific meaning (which we just explained, i.e. to connect to an app, device, or system).

So consider “log in” as a phrasal verb, meaning it is one unit despite being two words. That is why the preposition “to” goes after “log in” to make “log in to” the correct choice rather than “log into”.

This is a common mistake we see as proofreaders, not only from people who speak English as a second language but also from native English speakers. This is because the English language is full of such subtle rules that are hard to keep track of. As professional proofreaders based in Manchester, the United Kingdom, we are experts in keeping track of all of these rules, so you don’t have to! We ensure that whether it is your essay, speech, manuscript, or website content, we proofread it to the highest standards using our professional proofreaders, who are well aware of all these subtleties of the English language. You can check out our prices and turnaround time options or upload a document on our instant quote page, which will do the work for you.

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