Email Format Checker – Validates Structure & 200+ Domain TLDs

Have you ever had to go through a long list of email addresses looking for invalid ones? It can be frustrating and take a lot of time. Our free Email Validator Tool helps make that easy. It checks that each email is formatted correctly and that the domain extensions are real and recognized worldwide. Whether you’re managing a newsletter, contact form, or user sign-ups, this tool helps you quickly find and fix invalid emails so your list stays clean and accurate.

Try these examples to see how the tool works:

  • test@example.con – Invalid TLD
  • test@example,com – Invalid format (comma instead of dot)
  • test@example – Incomplete domain (missing TLD)
  • TESTEXAMPLE.COM – Missing "@" symbol
Email Validator
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How to Use the Email Validator Tool

  • Paste your email addresses into the box above—one email per line. There’s no limit to how many you can check at once.

  • Click the “✅ Validate Emails” button below the input box.

  • The tool will check each email’s format and verify the domain extension (TLD) against a predefined list of valid domains.

  • You’ll instantly see two columns below:

    • Valid Emails (correctly formatted with valid domains)

    • Invalid Emails (with clear reasons why each email is invalid)

  • Use the Copy buttons to copy all valid or invalid emails quickly. Click Clear All to reset the input and results.

Common Email Validation Errors Explained

Email Validation Error Explanations

Invalid format:
The email does not match the basic email pattern — this could be due to missing “@” symbols, spaces, commas, or other invalid characters.
Examples: name@domain,com, namedomain.com, name@ domain.com

  • Missing "@" symbol
    Your email must include exactly one “@” symbol separating the local part and the domain.
  • More than one '@' symbol
    Emails cannot have multiple “@” symbols.
  • Contains space(s)
    Emails cannot contain spaces.
  • Invalid character: comma (',' instead of dot '.')
    Use a dot (.) instead of a comma (,) in your email address.
  • Missing local or domain part
    The part before or after “@” cannot be empty.
  • Consecutive dots in local or domain part
    Two or more dots (..) cannot be adjacent in the email.
  • Domain starts or ends with a dot
    The domain part cannot start or end with a dot.
  • Domain label starts or ends with a hyphen or is empty
    Parts of the domain cannot start or end with a hyphen (-), and must not be empty.
  • Incomplete domain (missing dot)
    Your domain should have at least one dot separating subdomains or TLDs.
  • Missing TLD
    The domain is missing a valid top-level domain (TLD).
    Examples: name@domain, user@mailserver
  • Unknown TLD
    The domain uses a TLD not recognized or allowed by our system.
    Examples: name@domain.con, user@example.xyzx
  • Invalid domain label before TLD
    Labels before the TLD should be valid (no single letter or labels with digits only).
  • Domain not recognized as common free email domain
    The domain isn’t a common free email provider (e.g., gmail.com, yahoo.com), so double-check for typos.

Frequently Asked Questions

Can this tool tell me if an email is active?

No, it only checks formatting and domain validity, not whether the mailbox exists.

What’s a valid TLD?

A top-level domain like .com, .net, or .org that’s recognized globally.

Is this tool free to use?

Yes, this email validator is completely free to use—no sign-up or download required.

Can I use this for my website or project?

Absolutely! This tool is ideal for developers, marketers, and business owners who want to prevent invalid emails in forms or sign-up processes.

Will this tool detect typos in email addresses?

It can identify some common formatting mistakes, but it doesn’t check for misspelled domain names or typos beyond the structure and TLD validation.

Can I use this tool to validate multiple emails at once?

Yes! You can paste a list of email addresses—there is no limit. The tool will validate each email’s format and domain extension individually.

Does this tool store or share the emails I enter?

No, the tool does not store or share any email addresses entered—your data privacy is respected.

Privacy Statement

We respect your privacy. This Email Validator Tool does not store, share, or sell any email addresses you enter. All validation is performed securely in real-time, and your data is never saved on our servers. You can use the tool with confidence knowing your information remains private and secure.