Into vs in to: when it is one word, when it is two, and a quick test
Into is one word when it shows movement inside, contact or a change: walk into the room, run into a problem, turn a talk into a book. In to is two words when "in" belongs to the verb before it and "to" starts something new: turn the draft in to your editor. Here is a quick test, examples and the few cases where either is fine.
When it is one word: into
Dictionary.com describes into as a preposition used in several ways:
- Toward the inside of something: "She tucked the notes into the folder."
- Against, or meeting something: "We ran into a problem with chapter 4."
- A change or transformation: "Ten interviews turned into a book."
When it is two words: in to
Often "in" and "to" just happen to sit next to each other. Dictionary.com explains the usual reason: "in" is part of a phrasal verb (a verb plus a small word, like turn in, give in, log in, call in), and "to" is a separate preposition or the start of an infinitive (to see, to save).
- Phrasal verb + to: "Turn the manuscript in to your editor." (turn in = hand over)
- Give in + to: "Don't give in to the urge to rewrite chapter one again." (give in = yield)
- In + infinitive: "I went in to ask about the proofs." (in = inside, to ask = why)
Dictionary.com's own warning example is a good one to remember: if you "turn your homework into your teacher," you have transformed it into a person.
A quick test
Ask whether the sentence means movement inside, contact or becoming something. If yes, it is into. If you can remove "to" and what follows and the verb still makes sense on its own (turn in, give in, went in), it is in to.
Examples
| Sentence | Form | Why |
|---|---|---|
| The podcast series grew ___ a book. | into | A change |
| Hand the final draft ___ the publisher by June. | in to | hand in + to |
| She put years of research ___ the appendix. | into | Toward the inside |
| He called ___ the radio show to talk about his book. | in to | call in + to |
| I almost gave ___ the temptation to quit. | in to | give in + to |
| We ran ___ the same question in every interview. | into | Meeting something |
Examples written by Scribe Media.
When either is fine
Some phrasal verbs blend with into's meaning closely enough that both forms are accepted. Dictionary.com treats "I logged into my account" and "I logged in to my account" as meaning the same thing. In a book, pick one and put it on your style sheet so it stays consistent. (Onto and on to work the same way as into and in to.)
Checking your manuscript
Search your file for "into" and "in to" and read each one with the test above. A copy editor will catch the rest; see what a copy editor does. For more pairs spellcheck misses, see ensure vs insure and compliment vs complement.
Start here: search your manuscript for "in to." For each one, check that "in" belongs to the verb before it. If the meaning is movement inside or becoming something, close it up to "into."
Common questions
What is the difference between into and in to?
Into is one word, a preposition meaning movement toward the inside of something, contact, or a change: "She walked into the room," "The talk turned into a book." In to is two separate words that happen to sit side by side, usually because in belongs to a verb (turn in, give in, log in) and to starts what comes next: "Turn the draft in to your editor."
Is it log into or log in to?
Both are accepted. Dictionary.com gives "I logged into my account" and "I logged in to my account" as having the same meaning. Pick one and use it consistently.
Is it turn in to or turn into?
It depends on the meaning. "Turn the manuscript in to the publisher" means hand it over, so it is two words. "The blog turned into a book" means became, so it is one word.
Is it give in to or give into?
Give in to. "Give in" is the verb, meaning to yield, and "to" introduces what you are yielding to: "Don't give in to the urge to edit while you draft."
Sources: Dictionary.com, "In To" vs. "Into" (into as a preposition for inside, against and change; in to with phrasal verbs and infinitives; log into and log in to both acceptable; the homework example; onto and on to), read November 2, 2026. The test, examples and guidance were written by Scribe Media. Published by Scribe Media.