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Short answer: A custom domain makes your URLs look like they come from you, which boosts trust, improves email/SMS deliverability, can increase click-through rate (CTR), and keeps your brand consistent everywhere. If you send links in email (newsletters, outreach, lifecycle), use a custom domain.

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What “Custom Domain” means in ShortPen

ShortPen includes a default domain (shr.pn), but you can connect your brand’s domain or a subdomain (for example, go.yourbrand.com) and use it when you create links.
Learn more: How custom domains work in ShortPen

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Benefits

  • Trust & recognition: People see your brand in the URL, which feels first-party and professional.
  • Better deliverability & more clicks: Branded URLs help newsletters and creator content land and get clicked.
  • Brand consistency: Use the same domain across ads, email, social, and QR codes. Pair it with social previews for a fully branded share.
  • Control & reliability: You manage DNS and can check domain status anytime in ShortPen.
Custom domains are available on all plans (the Free plan includes one custom domain).

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When should I use a custom domain?

A custom domain is the recommended setup when you’re:
  • Sharing links publicly (social posts, bio links, communities)
  • Running paid campaigns (ads, influencers, affiliates)
  • Using QR codes on physical assets (packaging, flyers, events)
  • Sending links in email (newsletters, lifecycle, outreach)
  • Working with clients or multiple brands (separate domains per workspace/client)
  • Publishing evergreen links you want to keep consistent for months/years
When you put a link in an email, inbox providers and security systems evaluate more than your sender domain. They also evaluate the message’s domains. If you use a shared short domain (like shr.pn), you inherit part of the reputation of a domain that’s also used by other senders. If that shared domain gets associated with abuse, your emails may be more likely to land in spam, get warnings, or have links disabled. A custom domain isolates link reputation to your brand, keeps your links consistent, and reduces the chance of being affected by other senders’ behavior.
Note: ShortPen applies stricter automated checks and rate limits on the shared domain to protect its reputation, but a dedicated domain is still the most reliable setup for email-first use cases.

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FAQ

No. Your link-level and workspace analytics work the same. You may simply get more traffic due to higher trust/CTR.
Yes. ShortPen supports connecting your domain or a subdomain (e.g., go.yourbrand.com).
A QR encodes the full URL. If you change the domain or slug, old QRs still point to the old address. Re-download the QR from the link’s QR section and replace it wherever it’s used.
Learn more: What happens to a QR code after changing a link?
Yes. Organizations can connect one or more custom domains and see each domain’s status.
Because it’s a shared shortener domain. Some email providers and corporate security tools treat shared shorteners cautiously since they’re often used to hide malicious destinations. A custom domain reduces that shared-risk factor.