Email Validator
Check whether one or many email addresses are validly formatted — paste a list, get a pass/fail for each. Free, in your browser.
Try an example
A mix of valid and invalid addresses — load it to see the checks.
hello@sgbp.tech
jane.doe@company.com.sg
not-an-email
user@@bad.com
support@example.orgFormat validation vs deliverability
Format validation (what this tool does) catches typos and malformed addresses cheaply, client-side. It does not confirm the mailbox exists — that needs an SMTP check or a verification email. The pragmatic rule: validate format first, then send a confirmation link to prove the address is real.
Frequently asked questions
What makes an email address valid?
A valid address has a local part, an @ sign, and a domain with at least one dot (e.g. name@example.com). This tool checks the format against a pragmatic RFC-5322-inspired pattern.
Does this check if the email actually exists?
No. It validates the format only — it does not send anything or check whether the mailbox is deliverable. Format validation is the right first step before you attempt delivery.
Can I validate a whole list at once?
Yes. Paste multiple addresses, one per line or comma-separated, and you get a pass/fail for each plus a summary count.
Is it free and private?
Yes — it runs entirely in your browser, nothing is sent anywhere, and there is no sign-up.