I posted a question which was closed as off-topic and it seems like it could fit on another site in the network. How can I go about moving it there?

  • What is migration and how does the process work?
  • Who can migrate questions?
  • When should I consider migration?
  • What can cause migrations to be rejected?

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What is migration?

Migration allows an off-topic question to be gracefully moved to another site in the Stack Exchange network. It preserves the current revision of the question, all its answers, any comments on any post, as well as most of the votes.

When a question is migrated, a new copy of the question is posted on the destination site (the "destination question"), and the original question is demoted to "stub" status (see below).

Side effects of migration

  • The destination question's score is reset to zero if the origin question had a negative score. Otherwise, its score is retained, and the votes are attributed to the Community user.

    • The original scores are preserved for the answers, with the votes (again) being attributed to the Community user.
  • If a user who participated in the question does not have an account on the target site, their username is displayed as plain text until they create an account.

  • Answers on the origin site are deleted immediately upon question migration. (This causes a reversal of all associated reputation on the origin site.) The answers will be visible on the destination question.

  • The question is left as a stub, or pathway to the new site, for 30 days, after which it is automatically deleted. During this time, the stub question will be locked to preserve the post in its original state, preventing comments and votes. (Again, this deletion causes a reversal of all associated reputation on the origin site.) Note that the old link will continue to redirect to the new question even after that time.

  • When a post is migrated, the destination question will contain a notice saying that it was migrated and contain a link to the old (now stub) question's revision history. This will be publicly visible to <10k users even after the stub is deleted.

    • On posts migrated from sites whose domain names were later changed (e.g. from Meta Stack Exchange prior to the split from Meta Stack Overflow), the links to the revision history were not updated, so to see it you may have to manually modify the URL to the new domain.

When can a question be migrated, and who can migrate it?

Only questions which are less than 60 days old can be migrated; this rule also applies to moderators.1

Any user with 3,000 reputation (250 if it's your own question) can vote to migrate a question to another site via a list of up to five sites, which are most relevant to that site. Simply load the close dialog, select the off-topic because close reason, and then select belongs on another site in the off-topic reason list. This will present the list of available migration targets.2

Getting to the migrate screen

In order for the question to be migrated, at least three of the close votes (four on Stack Overflow) must be for migration to the same site. If the question reaches five close votes without this majority, the question will simply be closed for the next most-commonly selected reason. If the majority reason is for migration, but the majority votes are not all for the same site, the question will be closed as off-topic.

If you don't have 3,000 reputation, you may flag to migrate it just as you would cast a recommend closure flag. This would put the question into a queue for users with enough reputation to review and possibly cast votes.

If the question has already been migrated from another site, you won't see the option to migrate it. Flag for a moderator to migrate it.3 (Note that there exists a special process for rejecting a migration that does not require a moderator's intervention; see the "What causes a migration to be rejected and what happens after?" section below.)

If the site isn't in the list of available migration targets, or the question got closed without being migrated, first read the below points and consider if migration is/was really the appropriate action (in many cases, it isn't). If you think so, you can flag the question for moderator attention and request that they migrate it for you. Simply explain in the reason which site you want it to be migrated. (Please specify only one site; don't list all possible sites it could go to.)

Things to consider when migrating questions

Here's a basic flowchart to guide you through the decision on whether you should vote to migrate:

Flowchart 1

Flowchart 2

Some important points:

  • Don't migrate crap! Ever. If the question is likely to be closed or deleted on the destination site anyway, don't bother migrating it. Just vote to close it normally and advise the OP of the other site in the comments. If they decide to improve the question, then they can go post it over there, or they can edit their question so it's on-topic on the original site.

  • Check for cross-posts. It may be possible, that after hearing about the other site, that the OP may cross-post their question onto the other site. Therefore, check the intended destination site for potential cross-posts before voting to migrate. If it has been cross-posted, vote to close it instead, as cross-posting is prohibited even if the question is on-topic on both sites.

  • Avoid migrating answered questions. The point of migration is to send the question to a place where it is on-topic and can get answered. If the OP already has an answer, then we've already defeated the purpose of migration and the destination site won't have anything to do with the question. Avoid migrating these questions unless they are of extremely good quality and risk deletion on their current site.

  • Don't migrate for the sake of migration. We only migrate questions because they are off-topic on the original site. It is perfectly possible for a question to be on-topic on multiple sites, but that is not a reason to migrate it elsewhere, unless the OP requests migration. As a general rule, if someone asks a question here, and it's on-topic here, it should stay here.

  • Be familiar with the destination site. If you are not familiar with the destination site, read through its about page and help center thoroughly and make sure the question actually belongs there. Don't just look at the name of a site and automatically assume that the question can be asked there. Each site has its own rules, and rules vary greatly across sites.

  • If you're not sure, don't vote to migrate it. Let someone else who is sure do that, just vote to close it as off-topic, or ask for opinions from the community in a relevant chat room.

What causes a migration to be blocked and what happens after?

A migration can be automatically blocked before it even gets migrated if any of the following conditions apply:

If a migration gets blocked, the question will just get closed as off-topic, and not migrated.

What causes a migration to be rejected and what happens after?

A question will be considered rejected by the target community after it has already been migrated if, on the target site, it gets closed for any reason other than as a duplicate, or deleted (provided it wasn't already closed as a duplicate or merged), while the migration stub on the original site still exists (hasn't been deleted).

When a question which was already migrated gets rejected later, the entire process of the migration is reversed, except the original question will remain closed as off-topic. All the answers are returned to the origin site and undeleted, and are subsequently deleted on the target site*. Also, the rejected question on the target site will be locked, then automatically deleted 30 days later by a weekly script.

If the stub question has been deleted on the origin site (usually automatically after 30 days), migration rejection will not occur, and the question will simply be closed without any other effects.

* If the original migration was to a meta site, the answers will not be automatically deleted there if the migration gets rejected.

Anything else I should know about migration?

  • Comments on the question that link to the homepage of the target site will be deleted. This is to remove redundant comments that tell the author to post on that site.

  • Locking a question that has been migrated from another site and closed without rejecting the migration will cause the "migration rejected" notice to show up on the question, regardless of whether or not the question is actually a rejected migration. Any other lock reason notice will be ignored, and the timestamp on the "migration rejected" notice will be the time it was locked.

  • Moderators have the ability to clear the migration history of a question if needed. This delinks the question from the migration stub on the origin site, and makes it act like it was just posted on the destination site in the first place. This is often used to prevent the effects of a rejected migration if the original site's stub still exists, or to re-migrate a question that was previously migrated from another site.

1 After 60 days, migrations can only be performed by Stack Exchange employees. These are performed only in very, very rare procedural cases and are usually not done on request.

2 Moderators may migrate to any site in the Stack Exchange network, including all meta sites, and aren't limited to just the five listed sites.

3 As a moderator, if you want to migrate a question that has already been migrated from another site, you must first clear its original migration history. Only SE staff can migrate already-migrated questions without doing so. Note that if a staff member re-migrates a question already migrated from another site, it won't be marked "rejected".

  • 2
    Can we clarify here what happens to up- and down-votes on answers that exist at the time of migration? It is clear the rep from those votes is reversed, but I believe the score of the answer remains intact when it arrives at the destination site. – Aaron Bertrand Nov 28 '13 at 4:44
  • 11
    Also I think "Avoid migrating answered questions." should be clarified further, e.g. questions with accepted answers. Just because a question has answers does not mean it has been answered, that the answers that already exist are of any respectable quality, or that it won't get better answers on the destination site. The motivation for migration is not always because it can't be answered on the source site; sometimes it's just that it has the best chance at getting the best answer at the destination. – Aaron Bertrand Nov 28 '13 at 4:46
  • subsequently deleted on the target site - how long after the rejection is it deleted? – yoozer8 Jan 7 '14 at 20:49
  • 36
    I disagree with the idea of "not migrating answered questions." They serve a better purpose in the community that supports it where items can be linked or marked as duplicates, rather than be left on the source site. – Werner May 1 '14 at 19:44
  • 9
    I agree with Werner. It also helps when searching. – ignis May 15 '14 at 14:36
  • I wonder what happens if the original questioner doesn't have an account yet on the target site of the migration? – Trilarion Jun 20 '14 at 7:52
  • 1
    @Trilarion: It gets migrated, and if the user follows and creates a linked account, he'll get his question too. – Deduplicator Mar 10 '15 at 20:56
  • @Deduplicator It's not completely clear what you mean by "he'll get his question". Is the migrated question visible before he creates a linked account (and if so who is displayed as the owner)? – Trilarion Mar 10 '15 at 21:42
  • @Trilarion: Ok, rephrased: He'll get ownership of his question on the target-site then. – Deduplicator Mar 10 '15 at 21:45
  • @Tim, no this doesn't work. (yet :)) – Shadow Jun 26 '15 at 10:32
  • 2
    how to request migrate their own posted questions to another site, whatever screenshot is not visible when you click flag – Vignesh Pichamani Aug 10 '15 at 11:59
  • 2
    @3N1GM4: 3,000 is the amount of rep (on non-beta sites) you need to vote to close a question. Flagging under the 'should be closed...' option for migration does not actually vote to close and migrate, it simply pushes the post you flagged into a review queue for users with more than 3k to review - only voting to close will actually have any effect. – Aurora0001 Jan 8 '17 at 19:16
  • 3
    @SonictheWizardWerehog Where did you get this weird idea of silent migration from? No such thing exists. And that is not how questions were migrated during the split. – animuson Mar 23 at 5:52
  • 1
    @SonictheWizardWerehog No idea what Shog is talking about, but that's not what happened with the mod Q&A. The post was migrated normally, and moderators deleted the migration history on both sides at later times. That is a normal tool that diamond moderators have always had. – animuson Mar 23 at 6:02
  • 1
    @SonictheWizardWerehog I'd imagine he's abusing aome direct path that's technically not supposed to work but since only staff can abuse it who cares. We used to do a similar thing to create fake duplicate close votes to add multiple duplicate targets before there was UI to edit the duplicate targets. I wouldn't call it a staff feature though. That only creates more confusion because most staff won't have any clue what you're talking about. – animuson Mar 23 at 6:19

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