How to Start a Tumblr Blog: Setup, Domain and Themes

By Umair Ali Sadaqat · Updated November 6, 2026 · Editorial policy

How to start a Tumblr blog: create the account, understand primary vs. secondary blogs, pick a theme, connect a custom domain, and know when to use your own site.

Short answer: To start a Tumblr blog, sign up at tumblr.com with an email, password, and username, pick a blog name (that becomes your tumblr.com address), choose what you'll post, and then customize your theme from the blog settings. Your first blog is your primary blog. You can add secondary blogs later, and you can connect a custom domain if you want a branded address. If you need a business site, a store, or tight control over SEO, consider a site you own instead.

Before you sign up: pick one purpose

Tumblr rewards blogs with a clear identity. Before you create anything, write one sentence: "This blog is for ___, and I'll post ___ times a week." A photo diary, a fandom archive, a poetry blog, and a brand's behind-the-scenes feed all need different themes and posting habits. If you can't finish the sentence, start with a secondary blog (see below) so you can experiment without tying up your main identity.

Step-by-step: create your Tumblr blog

Go to tumblr.com and choose to sign up.
Enter your email address, a password, and a username. The username is what people see when they follow you, so pick something you won't regret in a year.
Choose a blog name. Tumblr blogs live at a tumblr.com address built from this name, so check that it reads well in a link.
Follow the prompts to pick a few topics and accounts to follow. This fills your dashboard and is how most people find their first audience on the platform.
Make your first post from the dashboard. Text, photos, quotes, links, audio, and video are all available post types.
Open your blog settings and fill in the title, description, and avatar. A blog with no description and no avatar looks abandoned to new visitors.
Customize your theme (details below).

Spend ten minutes on steps 6 and 7 before sharing the link anywhere. People decide whether to follow after seeing your blog's front page, not your dashboard.

Primary vs. secondary blogs

Every account has one primary blog and can add secondary blogs. They behave differently, and the difference matters when you plan.

	Primary blog	Secondary blog (sideblog)
How many per account	One	Several; Tumblr's help center says up to ten new ones per day
Can like, follow, send asks	Yes	No
Can be shared with other members	Yes	Yes
Can be password-protected	Yes	Yes
Can be converted to the other type	Not officially	Not officially

Source: Tumblr's help center page on secondary blogs. Sideblogs can't follow, so your reading list and your likes live on the primary blog.

How to choose: use your primary blog for the identity you want tied to your follows and likes. Use secondary blogs for projects: a shared team blog, a themed archive, a business feed. If you think you'll want a second identity with its own followers and likes, you'd need a separate account with a different email.

Pick and customize a theme

Themes control layout, fonts, colors, and how posts display. The basic path is from your blog's settings: open the appearance or theme options, choose a theme, and use its options to change colors, header, and layout. Tumblr's theme customization guide covers this, and themes that allow it accept custom CSS in the Advanced Options section without touching the HTML.

A quick theme checklist

Text is readable: dark text on a light background or light text on a dark one, with nothing fancy behind it.
The blog title and description are visible without scrolling.
Posts look right on a phone. Preview on mobile before you share the link.
Your avatar is recognizable at small size.
The archive or search is reachable, so visitors can find older posts.

Editing the HTML

If you know HTML and CSS, you can turn on the custom theme option and edit the code. Tumblr's custom HTML page is clear on two points: staff won't troubleshoot custom code, and you should save a copy of your HTML before editing so you can restore it. Tumblr's developer docs describe the template syntax, such as variables like {Title} and blocks like {block:Posts}. Don't upload non-theme files to the theme asset uploader; the help center warns that this can get an account banned.

Connect a custom domain

A custom domain replaces your tumblr.com address with your own, such as yourname.com or blog.yourname.com.

Decide on the address. A subdomain (blog.yourname.com) is the simplest if you already have a website at the main domain.
In your Tumblr blog settings, look for the Domains section and follow the connect flow. Tumblr checks your DNS records before it completes the setup.
At your domain registrar, add the DNS records Tumblr asks for. Tumblr's DNS help describes a CNAME record from a subdomain to domains.tumblr.com. Third-party registrar guides also describe an A record for the root domain; use whatever Tumblr's own screen shows today rather than copying values from an old tutorial.
Wait for DNS to update. Registrar guides say this can take up to 48 to 72 hours, though it's often faster.
If you see a Tumblr error page at your domain, DNS is probably pointing correctly and the blog connection is the step that's missing.

If you want a custom domain on a secondary blog, Tumblr's help says you first create the subdomain and then contact support to connect it. Check the current domain pricing in the Tumblr dashboard rather than relying on older articles.

Make the blog worth following

Post on a schedule you can keep. Three posts a week for a year beats thirty posts in week one.
Use tags on every post. Tags are how people discover blogs, so tag with the words a stranger would search.
Reblog with a purpose. Reblogging builds your reading identity, but original posts are what give people a reason to follow you.
Pin a post. Put an intro or "start here" post at the top so new visitors know what the blog is.

When to use your own site instead

Tumblr is good for casual, community-driven publishing. It's a weaker fit when you need to own the whole experience. Consider your own site if:

You're selling products or services and need checkout, booking, or a contact form on your own pages.
You want full control of page titles, URLs, and metadata for search. If that's you, read our SEO for startups guide.
You're building a business and need a brand that can't be changed by a platform's policy.
You want to leave Tumblr one day without losing your address and audience.

Goal	Tumblr	Your own site
Hobby, fandom, or art blog	Good fit	Optional
Community and reblog discovery	Built in	You build it
Online store or bookings	Not the focus	Better fit
Full control of SEO setup	Limited	Full
Portable if you leave a platform	Harder	Easier

If you go that route, We.Inc's free plan lets you publish up to three sites from ready-made templates; the AI builder that drafts a site from a prompt starts on the Starter plan at $20 a month. You can sign up here. If you're also weighing other blogging platforms, see our Blogger alternatives roundup, and if the blog is the start of a business, read how to start an online business.

Pre-launch checklist

[ ] Username and blog name chosen
[ ] Avatar, title, and description set
[ ] Theme previewed on desktop and phone
[ ] First three posts published and tagged
[ ] Intro post pinned
[ ] Custom domain connected, if wanted
[ ] Decided whether you need a secondary blog for a side project

Frequently asked questions

Can I have more than one Tumblr blog on one account?

Yes. Your account has one primary blog, and you can add secondary blogs (sometimes called sideblogs) from the account menu. Tumblr's help center says you can create up to ten new secondary blogs per day. Secondary blogs can't like, follow, or send asks, and they can be password-protected or shared with other members.

Can I turn a secondary blog into my primary blog?

Not directly, according to Tumblr's own community posts and help material. The usual workaround is to rename or move content and start a new account, which is unofficial and may change over time. Decide which blog you want as your primary before you build an audience on it.

Can I use my own domain name with a Tumblr blog?

Yes. In your blog settings you can connect a domain, and Tumblr checks your DNS records before finishing. Tumblr's DNS help describes pointing a subdomain such as blog.yourdomain.com to domains.tumblr.com with a CNAME record. Connecting a subdomain to a secondary blog goes through Tumblr support. Check the Domains section in your settings for the current options before you buy anything.

Can I edit my Tumblr theme's HTML?

Yes. Turn on the custom theme option in your blog settings and open the HTML editor. Tumblr's help center says staff won't troubleshoot custom HTML or CSS, so keep a copy of the original code before you change anything. If the blog breaks, reinstalling the theme is the suggested fix.

Is Tumblr a good choice if I want to make money or rank in Google?

It can work for a hobby, portfolio, or fandom blog, but you don't fully control the platform, and Tumblr's custom HTML support is not something staff will help you with. If search traffic, a store, or a business brand is the goal, a site you own is usually the safer base.

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