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Email Validator icon

Free Email Validator Online

Check email address syntax and format online. Validate one address or a list of emails with clear results for common formatting problems, domains, subdomains and plus-addressing.

100% FreeNo Signup RequiredPrivacy Friendly
Privacy note: this validator performs browser-side syntax and domain-structure checks. It does not send email, access your mailbox, or confirm that a real person owns an address. Avoid entering confidential information.

Tip: paste multiple email addresses on separate lines for bulk email validation. Blank lines are ignored.

or drag a TXT/CSV file onto this area
Validation Summary
Total0
Valid Syntax0
Invalid0
Plus Addressing0
EmailStatusSyntaxDomain StructureProviderNotes

Important: “Valid” means the address passes the local syntax and domain-structure checks. This tool does not perform a live DNS/MX lookup or mailbox verification, so it cannot guarantee that an address can receive mail.

Free Email Validator Online

Use this free email validator to check an email address format before you add it to a contact list, signup form, spreadsheet, newsletter workflow or CRM. The browser-based checker looks for common syntax problems such as a missing @, missing domain, spaces, invalid characters, repeated @ symbols and malformed domain labels.

It also supports common email patterns used in the USA, UK and other countries, including subdomain addresses such as name@mail.example.com, plus-addressing such as name+sales@example.com, and UK-style domains such as example.co.uk. For multiple addresses, enter one email per line or import a TXT/CSV list.

This is a syntax and format validator, not a mailbox verification service. It does not send messages, access mailboxes, or claim that an address is deliverable. For privacy, ordinary validation happens in your browser.

How to Validate an Email Address

  1. Enter one email address or paste a list with one address per line.
  2. Click Validate Emails.
  3. Review the syntax, domain structure, provider type and notes for each address.
  4. Fix any invalid addresses and validate the list again.

Email Address Checks Supported

The checker handles common valid email formats, invalid email formats, missing @ symbols, multiple @ symbols, spaces, invalid characters, subdomains and plus-addressing. It also recognises common free webmail domains for a simple provider label. A domain is assessed for structure only; a live DNS or MX lookup is not performed.

Bulk Email Validation in Your Browser

For a small contact list, paste multiple addresses into the validator or import a TXT/CSV file. The results table separates valid syntax from invalid entries so you can clean a list before using it in another application. This workflow is useful for email list cleanup, contact data checks and basic form testing.

Frequently Asked Questions

Is this email validator free?
Yes. It is available as a free browser-based email format checker.
Can it verify that an email address really exists?
No. It checks syntax and domain structure only. It does not send a verification message or perform a live mailbox/MX verification.
Does it support plus-addressing?
Yes. Formats such as name+tag@example.com are supported when the rest of the address is valid.
Can I check a subdomain email?
Yes. Addresses such as user@mail.example.com can pass when their syntax and domain labels are valid.
Can I validate multiple email addresses?
Yes. Paste one address per line or import a TXT/CSV file to review a list.
Does it work with UK email domains?
Yes. Standard domains such as example.co.uk are supported when the domain structure is valid.