Login vs Log In: Grammar for Tech Writing
Use the Right Form in UI and Documentation
📌 Quick Answer
Login is usually a noun or adjective. Log in is the verb phrase.
Memory Trick: If you can add "to" before it ("to log in"), use two words.
💡 Key Difference
Buttons can say "Login"; instructions should say "Log in to your account."
Quick Comparison
| Form | Use It For | Quick Check |
|---|---|---|
| Login | usually a noun or adjective | Match the sentence meaning before you choose. |
| Log In | the verb phrase | Match the sentence meaning before you choose. |
Common Mistakes
❌ Incorrect:
"Please login to continue."
✓ Correct:
"Please log in to continue."
You need the verb phrase in action instructions.
❌ Incorrect:
"I forgot my log in details."
✓ Correct:
"I forgot my login details."
As a noun, use one word.
🎯 Test Your Knowledge
1. You must ___ before checkout.
2. Your ___ attempt failed.
Frequently Asked Questions
Why do apps use "Login" on buttons?
UI labels often use noun-style wording for brevity.
Is "log into" acceptable?
Many teams use it, but strict grammar prefers "log in to."
Deep Dive
This topic appears in emails, reports, and essays. If you apply the quick rule above and check your sentence role, you can avoid the most common mistake.
For related usage patterns, see Into Vs In To and Setup Vs Set Up.
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