Email Validator — Check If an Email Address Is Formatted Correctly

How to Use the Email Validator — Check If Email Addresses Are Valid

1. 1

   Paste your list of email addresses into the input box, one address per line.

2. 2

   Each address is validated instantly, with a green check for valid ones and a red X plus a specific reason for invalid ones.

3. 3

   Toggle 'Show only invalid' to focus on just the addresses that need fixing.

4. 4

   Watch for an amber 'Did you mean…' note under any address with a likely typo in a common domain.

5. 5

   Click 'Copy valid emails' to copy just the clean list, or 'Download CSV' to save the full results with reasons.

Why Use Email Validator — Check If Email Addresses Are Valid?

A list of email addresses collected from a signup form, a spreadsheet import, a scraped webpage, or years of accumulated contacts almost always has a few broken entries mixed in — a missing @, a stray space, a mistyped domain, or a truncated address from a copy-paste error. Sending to a malformed address wastes a send, can trigger bounce penalties that hurt your sender reputation with mailbox providers, and — if you're paying per-send through an email service — costs money for nothing. This tool checks each address against the actual rules for what a valid email address can look like: a properly formed local part before the @, a properly formed domain after it, and a real-looking top-level domain at the end. Rather than a single pass/fail, every failure comes with a specific reason so you know exactly what to fix rather than guessing. It also catches one of the most common real-world mistakes that passes basic format validation but is still wrong: a typo in a well-known provider's domain, like 'gmial.com', 'yaho.com', or 'hotmial.com' — these are checked against a short list of popular providers using an edit-distance comparison, so a near-miss gets flagged with a suggested correction. What this tool does not do is confirm an address is currently active or can receive mail right now — that requires an actual mail-server (MX record) lookup and, ultimately, sending a real message, neither of which a format checker can determine. Think of it as the fast first pass that catches the majority of bad entries before they ever reach a send.