Check the syntax of a domain name

Before an entry, import or submission, this helps teams and individuals catch a malformed value early. Check the syntax of a domain name.

Check the syntax of a domain name. The result appears instantly in your browser, ready to copy, with no account, upload or storage involved.

How to use

Type the domain name you want to check in the input field, or paste it from a configuration file.
Press the verify button to run the syntax check.
Read the result shown just below: it tells you whether the shape of the domain is accepted.
If your values already live in a file, import it as text, CSV, JSON, Markdown, XML or YAML.
Copy the result if you need to attach it to a ticket or to compare it with another list.

Example

The sample provided holds a plain domain name. After verifying it, look at how the result is laid out and whether the value is accepted as typed; that shows you the expected shape before pasting a longer list taken from a file.

Input

example.com

Limits and formats

The check works on syntax: it does not tell you whether the domain exists, is available or points to a live website.
A value that passes here may still be rejected later by a service that applies stricter rules of its own.
Names containing non-ASCII characters are handled differently across services, so confirm the expected form with the receiving system.

Where processing happens

The verification stays in your browser: both the text you type and any imported file are handled on your own device, and the result appears straight away on the page, ready to copy.

Frequently asked questions

What is the difference between checking syntax and checking that a domain exists?

Validation looks only at the shape of the text: the length of each part, the allowed characters and the separators. It contacts no registry, so a well-formed domain may already be taken or may not exist.

Can I check several values at once?

Yes, by importing a file that holds your values, for instance as text, CSV, JSON, Markdown, XML or YAML. The result is then displayed on the page, ready to be copied.

Does this replace an availability test?

No. A correctly formed value says nothing about whether a site is online, how it is hosted or how its DNS is configured. For those questions, a full domain diagnostic is the better choice.