I have two blogs in Tumblr, each under its own login name. I'd like to consolidate these two accounts, so that I can manage both blogs from a single account.
How would I go about doing that?
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Your primary blog
Your primary blog is the one created when you sign up for Tumblr. It represents you (with its name, link, and avatar) when you follow or like other Tumblr blogs.
Switching your primary blog or moving a primary blog to another account are not possible yet.
Transferring a primary Tumblr blog to another primary blog is not possible (though you can transfer a secondary blog to a new primary owner).
I just received this message from a Tumblr support representative:
Unfortunately, we can’t switch blogs from secondary to primary (or vice versa), nor can we merge accounts, move blogs between accounts, or move posts between blogs.
If you want to move a URL from one blog to another, you can do so by (1) changing the URL of the existing blog to something new so the URL is freed, then (2) changing the URL of a different blog to the freed URL, or creating an entirely new account with the freed URL.
You can always make changes to your URL/username in the Settings area of your blog.
Before you proceed, keep in mind that by changing your URL you will break links to your blog that other people have put in posts, reblogs, and bookmarks. Changing your URL will not affect your Followed/Following lists.
This has been the case for a while now. It's unclear if Tumblr has plans make merge possible.
It is not possible to transfer primary blogs, however you can transfer a secondary blog to a new primary owner. Here's one way:
After that is done check your email that you just invited. You'll see an email from Tumblr with the subject "Join". Click the link in the email to confirm the invite. Now you should see the transferred blog in your blog list. But it's not all yours yet. One more step. Log out of that Tumblr account and log back into the account you're moving the blog from.
Go back to the Dashboard for that blog and click the Members. Click Promote to admin for the account that you're transferring to, and now click Leave this blog for the account your transferring from. All done. That blog is now a secondary blog of a new primary owner.
Note: This answer is obsolete. Tumblr no longer has a Goodies section and it recently removed RSS import support.
Tumblr seems to have an export utility in the Goodies section (available for Mac OS X only). I am not certain how this export works exactly, so I can't suggest how you might get it back into your blog after that.
You could also consider using the Import RSS feature.
This doesn't "merge the blogs", but you'll end up with content from both, and you can just stop using the other one.