Into vs. In To: What's the Difference?
Learn when into is one preposition and when in to remains two words, with movement and phrasal-verb tests, examples, a quiz, and FAQs.
Into is one preposition expressing movement inside, transformation, collision, or strong interest. In to stays as two words when in belongs to a preceding verb or phrase and to begins a separate prepositional or infinitive phrase, as in log in to the portal or came in to help.
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A security guide tells users to “log into the portal.” Many readers accept that form, but the organization’s style treats log in as the phrasal verb, so the precise construction is log in to the portal.
Into vs. In To at a glance
| Word | Typical role | Meaning | Example |
|---|---|---|---|
| into | Preposition | to the inside of; toward a new state; in contact with | She placed the signed contract into the folder. |
| in to | Adverb plus preposition or infinitive marker | in completes one expression while to starts another | He came in to answer a question. |
How to use into
Into presents a single relationship involving entry, direction, transformation, impact, division, or interest. It is followed by a noun phrase.
She placed the signed contract into the folder.
How to use in to
In to is not a special compound. The words remain separate when in belongs with the verb before it, while to introduces a destination or a purpose.
He came in to answer a question.
Rules that make the choice easier
Use into for movement or change
Choose into when something enters a place or becomes a new state: walk into the room or turn water into ice.
Separate a phrasal verb from to
If in completes a verb such as log in, check in, or hand in, keep to separate when it introduces what follows.
Use in to before a purpose phrase
In came in to talk, the person came in, and to talk explains the purpose. Combining the words would change the structure.
Common mistakes to avoid
- Do not combine every adjacent in and to.
- Do not separate into when it expresses entry or transformation.
- Check the house style for log in to, because everyday usage sometimes treats log into as acceptable.
Quick practice
1. The cat ran ___ the kitchen.
Answer: into
2. Please log ___ the secure account.
Answer: in to
3. She stopped ___ ask for directions.
Answer: in to
Frequently asked questions
What is the difference between into and in to?
Into is one preposition; in to is two separate words performing different grammatical jobs.
Is it log into or log in to?
Many styles prefer log in to because log in is the phrasal verb and to introduces the destination.
Is it turn into or turn in to?
Turn into means transform. Turn in to can mean submit something to someone or go to bed, depending on the sentence.
How can I test into?
If inside, toward, or becoming captures the relationship, the one-word preposition is usually correct.