Quick answer: Into (one word) is a preposition showing movement toward the inside of something: She walked into the room. In to (two words) occurs when "in" is part of a phrasal verb and "to" belongs to what follows: She went in to see the doctor (went in, in order to see). Check whether "in" pairs with the verb before it. For a fuller definition, see the Cambridge Dictionary entry for ‘into’.
Comparison Table
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| into | preposition | movement toward the inside of something, or a change of state | The cat jumped into the box. |
| in to | adverb "in" + preposition/infinitive marker "to" | "in" completes a phrasal verb; "to" introduces a purpose or object | He came in to collect his mail. |
Using Into
Into is a single preposition describing entry to an enclosed space or a transformation from one state to another.
She walked into the meeting room five minutes late.
The recipe says to stir the sugar into the batter slowly.
The tadpole eventually grows into a frog.
He put the documents into the top drawer.
Using In To
In to appears when "in" is part of a two-word verb (go in, come in, hand in, turn in) and "to" introduces a separate purpose, infinitive, or object.
She dropped in to say hello before the trip.
Please hand your essay in to the front office by Friday.
He turned himself in to the police station.
We went in to check on the children before leaving.
Memory Trick
Ask yourself: does "in" belong with the verb right before it as its own phrasal verb (go in, hand in, turn in)? If yes, keep "in" and "to" apart: "in to". If the phrase is simply about entering or transforming into something, join them: "into" (think: "in-to the box" = movement to the inside).
Common Mistakes
✗ Please hand your homework into the teacher.
✓ Please hand your homework in to the teacher.
"Hand in" is the phrasal verb meaning to submit; "to the teacher" tells who receives it.
✗ The dog ran in to the garden to chase the ball.
✓ The dog ran into the garden to chase the ball.
Tips to Avoid Confusion
- If the sentence is about physical movement to the inside of something, use one word: into.
- If "in" is part of a phrasal verb (go in, hand in, turn in, drop in) and "to" starts a new purpose, keep them separate: in to.
- Try pausing briefly between "in" and "to" — if it still sounds natural, it's likely the two-word form.
- "Into" can also describe a change of state (turn into, translate into), not just physical entry.
For more on related grammar, see prepositions of movement. Also confusing: Afraid vs Frightened, Alone vs Lonely, Angry vs Furious. Browse all confusing word pairs →
Quick Check: Into or In To?
4 fill-in-the-blank questions — choose the correct word for each sentence.
1. “She poured the milk ___ the mixing bowl.”
2. “He handed his resignation letter ___ the manager.”
3. “We stopped ___ say a quick hello on our way home.”
4. “The novel was translated ___ twelve languages.”
Frequently Asked Questions
What is the difference between into and in to?
Into (one word) is a preposition showing movement toward the inside of something: "She walked into the room." In to (two words) occurs when 'in' is part of a phrasal verb (like 'go in', 'come in', 'hand in') and 'to' belongs to what follows, often an infinitive: "She went in to see the doctor" (went in, in order to see).
Why are into and in to so often confused?
They sound identical, and both involve 'in' plus 'to' in some order of thought, so writers often merge them without checking whether 'in' actually belongs to a separate phrasal verb before the following 'to'.
How can I test whether I need into or in to?
Check if 'in' is part of a two-word verb like 'go in', 'turn in', or 'hand in', with 'to' introducing a separate purpose or infinitive. If you can insert a pause or comma test between 'in' and 'to' and it still reads sensibly ("went in [in order] to see"), you likely need the two-word 'in to'. If the phrase simply describes movement to the inside of something, use 'into'.
Can into show change of state, not just physical movement?
Yes: "The caterpillar turned into a butterfly," or "They translated the book into French." Here 'into' describes a transformation or change of form rather than physical entry.
Does 'log in to' need into or in to?
It needs 'in to' (two words), because 'log in' is the phrasal verb and 'to' introduces the following noun: "Log in to your account." Writing 'login into' or 'log into' is common informally, but the precise construction is 'log in to'.
Is 'turn yourself in to the police' correct?
Yes — 'turn in' is the phrasal verb meaning to surrender, and 'to the police' tells where: "He turned himself in to the police." This is different from 'turn into', which means to transform: "He turned into a different person after the accident."
Can into be used figuratively?
Yes, very commonly in informal speech: "I'm really into hiking these days," meaning interested in or enthusiastic about something.
Is 'come in to work' or 'come into work' correct?
'Come in to work' (two words) is generally correct when 'in' pairs with 'come' as a phrasal verb and 'to work' explains purpose (to do your job), similar to 'come in to help'. 'Come into' a physical space, like 'come into the office', uses the one-word preposition for entering a place.
Does British and American English treat into and in to differently?
No — the underlying grammatical rule is the same in both varieties. The confusion is a matter of careful writing rather than a regional difference.
How can I remember into vs in to?
If 'in' pairs with the verb before it as a phrasal verb (go in, hand in, turn in) and 'to' starts a new idea, keep them as two separate words: 'in to'. If the phrase is simply about movement toward the inside of something, join them: 'into'.