Opt in means choose to take part, joining by your own decision: you will receive research updates only if you opt in. Until you tick the box and confirm, you're not included. An opt-in system is one where people take part only if they agree. The programme is introduced by to: Maya opted in to the mentoring scheme.
Want to use opt in in conversation?
Write a sentence — we'll show the mistakes right away and suggest how to say it more naturally.
The check is taking longer than usual. Your feedback will appear here automatically.
opt in; opt in to something; opt-in + noun
- You will receive research updates only if you opt in.
- Maya opted in to the optional mentoring scheme.
- The survey uses an opt-in system.
What changed
First versionYou can opt in the weekly newsletter.
RevisionYou can opt in to the weekly newsletter.
In looks like a preposition, so it seems the newsletter can follow it directly: opt in the newsletter. But here in is part of the verb, and what you join is introduced by to: opt in to the weekly newsletter. Opt into is also fine.
Opt out means leave something you're in by default: the box is already ticked and you have to untick it. Opt in is the empty box you tick yourself. Sign up means register or enrol: sign up for a course.
Your turn
Choose the expression meaning actively choose to participate: You are not included automatically; you must opt ___.
Show the answer
in — Since you're not included automatically, you have to choose to take part: opt in. Out would mean refusing.
Describe a programme or email list you opted in to, and how you did it.
Employees can opt in to the cycling scheme by completing a short form.
Learn to use new words without mistakes
Write phrases with the words you are learning. LetsWords shows mistakes in usage and grammar, suggests corrections and explains them, and review helps the words stick.