---
title: How can I use special characters in my custom domain on Vercel?
description: How to resolve error 'The specified value "yöur-domaín.com" is not a fully qualified domain name' when using special characters for a custom domain in Vercel.
url: /kb/guide/how-can-i-use-special-characters-in-my-custom-domain
canonical_url: "https://vercel.com/kb/guide/how-can-i-use-special-characters-in-my-custom-domain"
published: 2025-11-03
last_updated: 2025-11-10
authors: Lee Robinson
related:
  - /docs/concepts/projects/domains/add-a-domain
install_vercel_plugin: npx plugins add vercel/vercel-plugin
---
<!-- docsgraph:related -->
## Related pages

> **For AI agents:** Follow these links to understand how this page connects to the rest of the Vercel ecosystem. For the full cross-link map (inbound, outbound, prerequisites, and semantic neighbors), see the .graph.md link below.

- [Configuring Domains](https://vercel.com/docs/platforms/multi-tenant-platforms/configuring-domains?from=related) — Add, verify, redirect, and remove wildcard and custom domains for a multi-tenant application using the Vercel SDK.
- [Adding a Domain](https://vercel.com/docs/domains/working-with-domains/add-a-domain?from=related) — Learn how to add a custom domain to your Vercel project, verify it, and correctly set the DNS or Nameserver values.
- [Troubleshooting Domains](https://vercel.com/docs/domains/troubleshooting?from=related) — Learn about common reasons for domain misconfigurations and how to troubleshoot your domain on Vercel.
- [Set Up Custom Domain](https://vercel.com/docs/domains/set-up-custom-domain?from=related) — Add and configure a custom domain for your Vercel project using the CLI.
- [Working with Domains](https://vercel.com/docs/domains/working-with-domains?from=related) — Learn how domains work and the options Vercel provides for managing them.
- [How do I add a custom domain to my Vercel project?](https://vercel.com/kb/guide/how-do-i-add-a-custom-domain-to-my-vercel-project?from=related) — Learn how to add a custom domain to your Vercel project.
- [How do I add a domain using the Vercel API?](https://vercel.com/kb/guide/how-do-i-add-a-domain-using-the-vercel-api?from=related) — Information on adding a domain using the Vercel API.
- [Why is my Vercel domain not verified?](https://vercel.com/kb/guide/why-is-my-vercel-domain-unverified?from=related) — Information on why a Vercel domain may not be verified and how to verify it.
- [Can I use wildcard domains without switching to Vercel Nameservers?](https://vercel.com/kb/guide/wildcard-domain-without-vercel-nameservers?from=related) — Information on how to use wildcard domains without Vercel Nameservers
- [How do I transfer my domain to Vercel?](https://vercel.com/kb/guide/how-do-i-transfer-my-domain-to-vercel?from=related) — Information on how to transfer a domain to Vercel.

Full cross-link map for this page: [/kb/guide/how-can-i-use-special-characters-in-my-custom-domain.graph.md](/kb/guide/how-can-i-use-special-characters-in-my-custom-domain.graph.md)
<!-- /docsgraph:related -->


If you are using special characters unique to Unicode in your domain name, for example accents such as "è" or "ä" then you will receive the below error:

> The specified value "yöur-domaín.com" is not a fully qualified domain name

## Adding a domain with special characters to Vercel

In order to add these domains to your Vercel projects, you can use Punycode. Punycode is a way of representing Unicode with the limited ASCII character subset that is supported for domains.

For example, the domain in the above image would be represented as "xn--mywbsite-30a.com"

Once you have the Punycode representation for your domain you can follow our guide [here](https://vercel.com/docs/concepts/projects/domains/add-a-domain#add-and-configure-domain) and add this in place of the domain name.

## Converting a domain to Punycode

You can find a number of Punycode converters online, such as [punycoder.com](https://www.punycoder.com/), which you can use to find the ASCII representation of your domain. Then use the converted domain name to successfully add it to Vercel.