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One of the most frequent spelling questions I get from my students is about “login” versus “log in” — and I understand why. They’re nearly identical, the difference is invisible when you’re speaking, and both are all over your screen every single day. But the distinction matters, and it’s actually simple once you know the rule.
I’ll show you the core grammar rule that separates them (noun vs. verb), walk through real examples of each in context, and give you a memory trick that works. You’ll also see the five mistakes I see most often in student writing and how to fix them. By the end, you’ll be confident using both forms correctly.
Key Takeaways
- “Login” (one word) = noun or adjective — your username and password, or a description (login page, login credentials).
- “Log in” (two words) = verb — the action of entering your credentials to access a system.
- Memory hook — If you can replace it with “username and password”, use login (noun). If you can replace it with “enter your credentials”, use log in (verb).
- Phrasal verb alert — “log in” is a phrasal verb (log + in), always two words when used as a verb.
- Common error — Never use “login” as a verb. “I login to my email” is always wrong; it’s always “I log in to my email”.
The Core Rule: Noun vs. Verb
The entire distinction hinges on part of speech . Here’s the rule:
Login (one word, lowercase) is a noun or an adjective . It refers to your sign-in information — your username, password, and the credentials you use together.
Log in (two words) is a verb (specifically a phrasal verb). It means the action of signing in, the process of entering your credentials and gaining access.
That’s it. Once you see them as different parts of speech, the spelling choice becomes automatic.
Login as a Noun
When “login” is a noun, it refers to what you use to get into a system — your credentials, your sign-in information. Think of it as a thing.
Example 1: Your login is your username and password combined.
Example 2: Do not share your login with anyone else.
Example 3: I wrote down all my logins in a secure notebook.
Notice that in each case, “login” is the object of the sentence — the thing being acted upon. You have a login. You guard your login. You write down your logins. These are all noun uses.
Login as an Adjective
Login can also be an adjective when it modifies (describes) another noun. In tech contexts, you’ll see compound noun phrases like “login page”, “login screen”, “login credentials”, or “login form”.
Example 1: The login page requires a username and password.
Example 2: I forgot my login credentials.
Example 3: Click the login button to access your account.
In these cases, “login” is functioning as an adjective — it’s describing what kind of page, credentials, or button you’re referring to. You could rephrase each as “the page for logging in”, “the credentials for logging in”, or “the button for logging in”, which makes the verb sense clear underneath.
Log In as a Verb
Log in (always two words) is a phrasal verb — a verb made up of two parts: “log” + “in”. It means to sign in, to enter your credentials, to gain access to a system.
Example 1: You need to log in to your email account.
Example 2: I always log in first thing in the morning.
Example 3: She logged in to the website and placed her order.
When you use “log in” as a verb, it will always appear in the sentence as an action. You log in. They are logging in. I logged in yesterday. These are all verb uses, and the spelling is always two words.
Notice the structure: “log in to [something]”. The phrase “log in to” is a two-word unit. You never say “login to”; you say “log in to”.
Tip: If you can insert a noun between the two words — “log [noun] in” — it’s definitely a phrasal verb. Example: “log me in” or “log them in”. This reinforces that it’s two separate words.
Comparison Table: When to Use Each
| Word Form | Part of Speech | Meaning | Example |
|---|---|---|---|
| Login | Noun | Your username and password; your sign-in information | “Your login is saved in this browser.” |
| Login | Adjective | Describing a page, form, or system related to signing in | “The login page is down for maintenance.” |
| Log in | Verb (phrasal) | To enter credentials and access a system | “Please log in to your account.” |
Real-World Usage: The Difference in Context
Here’s how you’d see each form in actual sentences:
| Sentence | Form | Reason |
|---|---|---|
| “I forgot my login.” (meaning: username and password) | login (noun) | Refers to the thing you use to sign in |
| “I need to log in to my email.” | log in (verb) | Describes the action you’re doing right now |
| “The login screen appears after you restart.” | login (adjective) | Describes which screen (the one for signing in) |
| “They are logging in from multiple locations.” | log in (verb) | Describes what they are currently doing |
| “Save your login information somewhere secure.” | login (noun) | Refers to the information itself |
| “Log in with your email address.” | log in (verb) | Instruction to perform the action |
The Three-Minute Grammar Check
If you’re unsure in the moment, use this quick test:
Can you replace the word with “username and password” or “credentials”? If yes, use login (noun).
Example: “What is your login?” = “What are your username and password?” ✓ Correct.
Can you replace the phrase with “enter your credentials” or “sign in”? If yes, use log in (verb).
Example: “I need to log in to my account.” = “I need to enter my credentials to my account.” ✓ Correct.
Is it describing a page or form (like “login page”)? If yes, use login (adjective).
Example: “Go to the login page.” = “Go to the page for logging in.” ✓ Correct.
Common Mistakes Learners Make
✗ Incorrect: I need to login to my email account.
✓ Correct: I need to log in to my email account.
Why: “Need to” is followed by a verb. “Login” is not a verb; “log in” is.
✗ Incorrect: Please login with your username and password.
✓ Correct: Please log in with your username and password.
Why: This is an instruction (imperative) to perform an action. Use the verb form: “log in”.
✗ Incorrect: The log in page is slow today.
✓ Correct: The login page is slow today.
Why: “Page” is being described. Use the noun/adjective form: “login page”, not “log in page”.
✗ Incorrect: Can you help me with my log in?
✓ Correct: Can you help me with my login?
Why: You’re referring to your credentials. Use the noun form: “login”, not “log in”.
✗ Incorrect: I’m having trouble to login.
✓ Correct: I’m having trouble logging in.
Why: The gerund form of the phrasal verb “log in” is “logging in” (not “logining”). Use it after “trouble” or other nouns that take a gerund.
Sample Dialogues
At a bank’s customer service desk
Customer: I’m having trouble. I can’t log in to my account.
Agent: I can help. What’s your username?
Customer: My login is “jsmith2023”.
Agent: And your password?
Customer: I have it written down. I hope the login page accepts it.
Agent: It should. Let me check your account from here.
Two coworkers discussing a shared project
Maya: Have you logged in to the project management system yet?
Raj: Not yet. I’m trying to remember my login. Is it my email?
Maya: Yes. Once you log in, you’ll see the task board.
Raj: OK, trying now… the login page is loading.
Maya: Let me know once you’re in.
Gerunds and Infinitives: Special Cases
When you want to use the verb form in other grammatical contexts, remember these patterns:
Gerund (the -ing form): logging in
Example: “I’m having trouble logging in.” (Not “logining in”.)
Infinitive: to log in
Example: “I want to log in to my account.”
Past tense: logged in
Example: “I logged in this morning and saw the message.”
Third person present: logs in
Example: “She logs in to her email every morning.”
Related Verb Pairs: “Log On” vs. “Log In”
A quick note: “log on” and “log in” are usually interchangeable in modern English, though “log in” is far more common for websites and cloud services. “Log on” was more popular in older IT terminology and still appears in enterprise software. For your writing, prefer “log in”.
Less common: “I logged on to the system.”
More modern: “I logged in to the system.”
Quick Quiz
Choose the correct form:
- Please ________ to your account to view your order. (login / log in)
- Your ________ will be saved in this browser. (login / log in)
- The ________ page requires two-factor authentication. (login / log in)
- She ________ to her email and found an important message. (logged in / logged login)
- I’m having trouble ________ to the website. (login / logging in)
Answers: 1. log in · 2. login · 3. login · 4. logged in · 5. logging in.
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- Affect vs. Effect
- Accept vs. Except
Frequently Asked Questions
Is “login” ever a verb?
No. “Login” is only a noun or adjective. The verb is always “log in” (two words). If you need a verb, always use “log in”, “logging in”, “logged in”, or “logs in” — never “login” as a verb.
What’s the difference between “log in” and “log into”?
Both are correct and mean the same thing. “Log into” (one word) is slightly more common in casual writing, while “log in to” (two words) is technically more correct because “log in” is a phrasal verb. Either is acceptable: “log in to my email” or “log into my email”.
Can I use “login” as an adjective?
Yes. “Login” functions as an adjective when it modifies (describes) another noun: login page, login form, login credentials, login button. These are all correct and common uses in English.
How do I spell it when I’m talking about the gerund (the -ing form)?
The gerund is always “logging in” (two words), not “logining” or “loggingin”. Example: “I’m having trouble logging in to the website.” This follows the general rule for phrasal verbs.
What’s the plural of “login”?
“Logins” (with an ‘s’). Example: “I have five different logins to manage at work.” When referring to the verb, you don’t pluralize it — you use different verb forms instead: “They log in every day” (not “they logins”).
Why is “log in” a phrasal verb?
A phrasal verb is a verb + preposition combination that creates a new meaning. “Log” alone means to record information. “Log in” (log + in) means to enter credentials and access a system. The preposition “in” (or the particle “in”) changes the meaning completely, which is why it’s called a phrasal verb.
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