---
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"
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
---

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.