Substack Username Checker — Check Up to 5 Publication Names at Once
Enter up to 5 publication names (one per line). Spaces and special characters are removed automatically. Your Substack URL will be username.substack.com.
One name per line. Spaces are converted to hyphens. Special characters are stripped. Max 5 per check.
Suggested variations (click to add)
Click any suggestion to add it to the list above.
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Check All Platforms at OnceWhat is a Substack username and why does it matter?
Your Substack username forms the subdomain of your publication:
username.substack.com.
Every email you send, every post you publish, and every link you share carries this address.
It is the permanent home of your newsletter on the internet, so choosing a clean and
memorable name from the start saves you from a painful migration later.
Substack publications rank well on Google for author names and newsletter topics. The subdomain is indexed as a standalone site, meaning a well-chosen name helps readers and search engines identify what your publication is about and who it belongs to. Writers, journalists, and content businesses all use Substack as a primary publishing home, making it one of the most important handles to secure early.
Substack username rules
- → Length: Between 2 and 50 characters.
- → Allowed characters: Letters (a-z), numbers (0-9), and hyphens (-). No underscores, spaces, or other special characters.
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Hyphens: Hyphens are allowed in the middle of the name but not at the start or end. For example,
my-brandis valid but-mybrandis not. - → Case: Substack subdomains are lowercase only. All input is automatically lowercased.
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Custom domain: Once you have a Substack publication, you can connect a custom domain (e.g.
newsletter.yourbrand.com). However, the original subdomain remains active and is used as the fallback. - → Changes: Substack does not allow username changes after publication. Choose carefully before you publish your first post or send your first email.
Tips for choosing a great Substack publication name
janedoe). Publications with a distinct editorial identity often use the publication name (e.g. the-brief). Pick whichever you plan to lead with.the-morning-read is cleaner than themorningread and just as easy to rank.nycfoodie2024 will feel dated quickly. Pick something timeless that describes your editorial mission broadly enough to evolve with you.Why Substack matters for SEO and audience building
Substack publications are indexed by Google as standalone websites. Each post you publish gets its own URL under your subdomain, and those pages can rank for long-tail keywords in your niche. For writers and brands that publish consistently, a Substack is one of the fastest ways to build search-visible content without setting up a full website.
Substack vs a self-hosted newsletter: which is better for SEO?
A self-hosted newsletter (using ConvertKit, Beehiiv, or Ghost on your own domain) gives you full control over your URL structure and brand. However, starting on Substack is faster, free, and lets you validate your audience before investing in infrastructure. Many creators start on Substack and migrate to a custom domain later once they have an established readership.
From a pure SEO perspective, a custom domain will eventually outperform a Substack subdomain because all link equity flows to your domain rather than to Substack. But for early-stage growth, the ease of Substack and its built-in discovery features often outweigh the SEO advantages of a self-hosted setup.
Frequently asked questions
No. Substack does not allow username changes once your account is created. Your subdomain is permanent. This is one of the most important reasons to check availability and choose carefully before registering.
Yes. Substack Pro and paid plans allow you to connect a custom domain (e.g. newsletter.yourbrand.com). Your original subdomain remains active as a fallback and redirect. The custom domain becomes the canonical URL for SEO purposes.
The tool checks whether the Substack subdomain URL returns an active publication page. A result of "Available" means no active publication was found at that address. "Unknown" means the check could not complete, usually because of a network timeout, and you should verify by visiting the URL directly.
Yes. You can run up to 5 checks per day at no cost. Each check can include up to 5 publication names at once, giving you 25 Substack name checks per day in total.
Use the suggestion toggle above to generate common variations of your base name. Hyphenated versions (e.g. my-brand-daily), category suffixes (mybrandhq), or adding a topic keyword (mybrandfinance) are all worth testing. Also consider whether a completely different publication title might serve your brand better.
Yes. Public Substack posts are indexed by Google and can rank for long-tail keywords, especially when the topic is specific and the content is detailed. Many writers use Substack as their primary content platform precisely because the posts are discoverable through search without any additional SEO setup.