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Email Validator

100% Free

Validate email address format (RFC 5322), catch common domain typos, and clean a pasted list — all in your browser.

Format Check
Typo Detection
100% Client-Side
No Sign Up

Format and typo checks only — no MX or SMTP lookups. Everything runs locally.

7
Total
3
Valid
2
Invalid
1
Typos
1
Dupes
Validated email addresses with status and suggestions
EmailStatusNotes
jane.doe@example.comValidValid email format.
person@gmial.comTypo?Possible typo in domain "gmial.com".
not-an-emailInvalidMissing the @ symbol.
hello@company.co.ukValidValid email format.
a@@bad.comInvalidContains more than one @ symbol.
duplicate@test.comValidValid email format.
DUPLICATE@test.comDuplicateDuplicate of an earlier address in the list.

Embed This Tool

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Add Email Validator to your website or blog in seconds.

  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/email-validator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Email Validator">
</iframe>

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Share Email Validator with anyone — no login required.

  • Shareable link
  • No login required
  • Works on any device
  • No account needed

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How to Use

  1. 1 Paste one or many email addresses into the box
  2. 2 Separate addresses with new lines, commas, or semicolons
  3. 3 Watch each address get checked instantly as valid, invalid, typo, or duplicate
  4. 4 Click a suggested fix to correct a likely domain typo in place
  5. 5 Copy the clean valid list or download the full report as CSV

Features

  • RFC 5322-style format validation with a clear reason for every rejection
  • Domain typo detection (gmial.com → gmail.com) using edit-distance matching
  • Bulk paste — validate hundreds of addresses at once
  • Duplicate detection that's case-insensitive
  • One-click correction of suggested domain fixes
  • Copy valid addresses or export a CSV report — nothing is uploaded

Why it Matters

Invalid and mistyped email addresses quietly damage your sender reputation: every bounce signals to mailbox providers that your list is low quality, which hurts deliverability for everyone on it. Catching format errors and obvious domain typos before you import or send is a fast, free way to keep a list clean.

★★★★★

Use Cases

Clean Mailing Lists

Strip malformed and duplicate addresses before importing to your ESP

Signup Forms & CRMs

Spot-check exported contacts for typos that cause bounces

Catch Domain Typos

Fix near-misses like gmial.com or hotmial.com automatically

Protect Deliverability

Lower bounce rates that erode sender reputation over time

What this tool does

The Email Validator checks email addresses for valid format, catches likely domain typos, and flags duplicates — across a single address or a pasted list of hundreds. Each result tells you exactly why an address passed or failed.

How it works

Each address is tested against a pragmatic subset of RFC 5322: a local part, a single @, and a dotted domain ending in a real top-level domain. Valid addresses are then checked for domain typos by comparing against common providers using edit distance, so ‘gmial.com’ is matched to ‘gmail.com’. The logic is a pure function with no network calls — it does not do MX or SMTP verification.

Privacy

Everything runs locally in your browser. Your addresses are never uploaded, logged, or stored.

Frequently Asked Questions

Does this tool actually verify that an email address exists?
No. It checks the syntax (does the address follow the rules of a valid email) and flags likely domain typos, but it does not perform MX-record lookups or SMTP connection checks. Those require network access and can't be done reliably or privately in the browser. Use this as a fast first-pass filter to remove obviously broken and mistyped addresses.
What counts as an invalid email?
Anything that breaks the basic structure of a single local part, one @ symbol, and a dotted domain with a real top-level domain. The validator gives a specific reason for each failure — missing @, more than one @, a misplaced dot, consecutive dots, or a missing TLD — so you can see exactly what's wrong.
How does typo detection work?
The tool compares each address's domain against a list of popular providers (Gmail, Yahoo, Outlook, iCloud and others) using edit distance. If a domain is one or two characters away from a common one — like 'gmial.com' versus 'gmail.com' — it's flagged as a possible typo with a one-click suggested correction.
Can I validate a whole list at once?
Yes. Paste as many addresses as you like, separated by new lines, commas, or semicolons. Each one is validated independently, duplicates are flagged, and you can copy just the valid addresses or download the full results as a CSV.
Is my email list uploaded anywhere?
No. All validation runs entirely in your browser. The addresses you paste are never sent to a server, logged, or stored — closing or refreshing the page clears everything.
📖

Want to understand the math?

Browse all guides →
How Email Validation Works
email validation

How Email Validation Works: Syntax, Typos & Deliverability

What email validation can and can't tell you — the difference between syntax checking, typo detection, and real verification, and how cleaning a list protects your sender reputation.

23 Jun 2026

5 min read

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