Tumblr Username Checker

On Tumblr, the username, blog name and URL are the same thing: the name in tumblr.com/name. Every blog on your account has one, so secondary blogs need their own free names too. Enter a name below to look it up, then read Tumblr's own rules.

Tumblr username rules

Length	Up to 32 characters.
Allowed characters	Letters, numbers and hyphens.
Hyphens	A hyphen cannot be the first or last character.
Banned words	The name cannot contain "tumblr".
Released names	When someone changes their username, the old one is open for anyone to claim after 24 hours.
Inactive names	Tumblr does not release taken or inactive URLs on request.

Sources: Tumblr Help: changing your username / URL, Tumblr Help: unavailable, dormant or inactive blog names. Last reviewed 2026-10-18. Platforms change their rules; the linked help pages are the final word.

How to check a Tumblr username

Type the blog name only, without tumblr.com. Periods are removed before we look it up, since Tumblr does not accept them.
We load tumblr.com/<name> and look for the blog data Tumblr sends for real blogs. A 404 answer means no visible blog uses that name.
A "There's nothing here" page does not always mean the name is free. Tumblr says a hidden blog, or a name that is unavailable for other reasons, can show the same page.
The final answer comes from Tumblr: in Settings, edit the Username field. "Someone beat you to that username" means it is taken.

Tumblr username taken? What you can do

Join words with a hyphen (mia-draws) or add a topic or number. Keep hyphens away from the start and end of the name.
Wait and check again. When someone renames their blog, Tumblr frees the old name after 24 hours, but it does not release inactive names on request or put you in touch with the owner.
If the name is your registered trademark or someone is impersonating you, report it through Tumblr's abuse form and attach your trademark papers.
Tumblr also sells custom domains, so your blog can live at your own address even if the tumblr.com name is gone.

How to change your Tumblr username

On the web, click Settings in the dashboard sidebar and pick the blog on the right.
Click the pencil icon in the Username section (Blog name on secondary blogs) and type the new name.
Click Save. In the app: account icon, choose the blog, gear icon, Change name, then Save.
Links to the old URL break, so update your masterposts, description links and other profiles. Followers stay with you.

Reserved and restricted names

Names containing "tumblr" are refused. Tumblr does not hand over registered or otherwise taken names, but trademark owners and people being impersonated can report a blog through the abuse form.

Tips

Since the old name is open to anyone 24 hours after a rename, someone else can grab it. Rename only when you are sure.
Hyphens read clearly in a URL but are easy to forget when people type your name from memory.
Your main blog name is also your username across Tumblr, so pick the name you want to be known by on your primary blog.

Frequently asked questions

How long can a Tumblr username be?

Up to 32 characters, using letters, numbers and hyphens.

Can I use underscores or periods on Tumblr?

No. Tumblr blog names only allow letters, numbers and hyphens, and a hyphen cannot come first or last.

Can I get a Tumblr name from an inactive blog?

Not by asking. Tumblr says it does not release taken or inactive URLs and cannot put you in touch with the owner. Registered trademark owners can file a report.

What happens to my old Tumblr name when I change it?

Anyone can claim it after 24 hours, and links to the old URL stop working. Your followers stay with your blog.

Also check on other top platforms

Each platform has its own checker page with its own rules. Pick one to test the same name there.

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