Validate email addresses online with strict format and TLD checks. Free browser-based email validator and verifier — instant, accurate, no signup.
The Tooloogle Email Validator checks whether an email address is well-formatted in your browser as you type. Enter the address and instantly see Valid or Invalid — the validator confirms the local part, the ``@`` separator, the domain, and the top-level domain (TLD) all match the syntax of a real email address. Use it to spot typos in newsletter signups, sanity-check addresses copied from a CSV before sending a campaign, validate user input in mockups, or just confirm that ``user@example.museum`` (a real long TLD) parses correctly. The whole check runs locally; no account, no upload, no rate limit, and no email is ever sent to verify the address.
The validator runs the entered address through a regular expression based on the practical subset of RFC 5322 that matches what real-world email systems accept: a non-empty local part using letters, digits, underscores, hyphens, and dots; the ``@`` separator; a domain with letters, digits, hyphens, and dots; and a TLD of at least two characters. The check is purely syntactic — it tells you whether the address could exist according to email standards, not whether the mailbox is actively monitored or whether the domain accepts mail. Syntactic validation is the right first line of defense before sending: a well-formed address still might bounce, but a malformed address always will, and catching format errors before sending saves bounce rates, sender-reputation damage, and money on email-service-provider quotas.
Live validation as you type — no "Validate" button, no waiting; the result updates with each keystroke.
Modern TLD support — accepts long TLDs like ``.museum``, ``.travel``, ``.engineering``, and ``.photography`` (legacy validators that hard-code 2–3 characters reject these).
Strict but practical regex — based on the real-world subset of RFC 5322 that actual mail servers accept.
Clear pass/fail label — shows "Valid" or "Invalid" with no ambiguity.
Browser-only — the regex runs in your tab; the address you check never leaves your device. No analytics, no logging, no signup.
No outbound mail — the validator never sends a test message; nothing about the lookup is visible to the address owner.
SSR-friendly — the page is meaningful for crawlers and accessible immediately.
Type or paste the email address into the input field. Validation begins on the first keystroke.
Read the result — "Valid" appears as soon as the address matches the format; "Invalid" appears when it doesn't (or while you're still typing).
Fix typos as you spot them — common ones: missing ``@``, missing TLD, extra spaces, ``,`` instead of ``.``, missing local part.
For bulk validation — paste each address one at a time; this tool is single-address. For a CSV with hundreds of addresses, run the format check programmatically and use this tool to spot-check edge cases.
Sanity-checking a single address before sending an important email. Catching typos in a newsletter signup form before the user submits. Verifying an address copied from a printed business card or PDF where the OCR may have garbled a character. Cleaning a contact list before importing into Mailchimp, ConvertKit, or another email-service provider where bounce rates affect deliverability and pricing. Designing form-field validation in a UI mockup — this tool gives you the regex spec to embed in your front-end. Confirming that an unusual domain (long TLD, internationalized domain) actually parses correctly. Confirming that a generated address matches your intended pattern. Quick QA of an email-input UX without spinning up a development environment. Teaching a junior developer or non-technical colleague what makes an email address valid.
This tool performs syntactic validation only: does the string look like a valid email address per RFC syntax? It does not perform deliverability validation, which would require:
DNS lookup on the domain to verify it has MX records (a mail server that accepts mail).
SMTP probe against that mail server to verify the specific mailbox accepts mail (most servers reject probes outright as a spam-prevention measure, so this is unreliable).
Disposable-domain check against a list of throwaway providers (Mailinator, Guerrilla Mail, etc.).
Role-account detection for ``info@``, ``sales@``, ``support@`` addresses (these often have low engagement).
Deliverability checks require a server, an external DNS resolver, or a paid third-party API — all of which mean the address would have to leave your browser. For privacy-respecting bulk-cleaning, run syntactic validation locally first, then submit only the syntactic survivors to a deliverability service if you need that depth.
Accepted (valid):
``user@example.com`` — standard.
``first.last@example.co.uk`` — multi-part TLD.
``user-name@example.com`` — hyphen in local part.
``user_name@example.com`` — underscore in local part.
``info@example.museum`` — long TLD (the new validator accepts this; the old 2–3-character regex rejected it).
``user@sub.example.com`` — subdomain.
Rejected (invalid):
``user@`` — missing domain.
``@example.com`` — missing local part.
``user@example`` — missing TLD.
``user@example.c`` — TLD too short (must be 2+ characters).
``user name@example.com`` — whitespace.
``user@@example.com`` — double ``@``.
``user@.com`` — empty domain label.
Always validate email syntax client-side and again server-side — client-side validation is for UX, server-side for correctness. Don't over-validate — many strict regexes reject valid addresses (long TLDs, plus-signs in the local part, internationalized domains) and frustrate users. The Tooloogle validator deliberately uses a practical-not-perfect regex to balance acceptance and rejection. Treat ``user+tag@example.com`` (plus-sign aliases) as valid — users on Gmail, Fastmail, and many other providers use them legitimately. For bulk cleaning, format-check first to remove obviously-bad addresses; only then pay for a deliverability check on the remaining list. Always make the "please correct your email" UX gentle — ask for confirmation rather than blocking submission, because legitimate edge-case addresses do exist.
The validator never uploads the address you check. The regex runs locally in JavaScript — verify with DevTools that no network requests fire as you type. Because the validator is purely syntactic, no DNS lookup, no SMTP probe, and no third-party service is involved, so the address owner never learns that someone validated their address. This is meaningfully different from deliverability-check services, where the act of validating an address can leak metadata about who's being targeted.
Tooloogle's validator is fast, free, and respects modern email standards (long TLDs are accepted). Live validation as you type means typos are caught immediately, before submitting a form. The strict-but-practical regex is the same shape mainstream email services use, so addresses that pass the Tooloogle check will generally pass server-side validation too. Browser-only processing means no signup, no rate limit, no logging of the addresses you check — safer than "free email verifier" sites that quietly add the addresses you check to their marketing databases. Bookmark the page for the next time a typo in a contact-form submission catches your eye. Pair the validator with the Tooloogle Email Template Generator when drafting outreach campaigns, the Slug Generator when normalizing user-provided strings, and the Word Counter when sizing up your email body before sending.
How to Use Email Validator - Verify Email Address Format Online
Type or paste your email into the input field (e.g. email@domain.com).
The tool instantly checks if the email format is valid.
See whether the email is valid or invalid right below.
Validate email addresses online with strict format and TLD checks. Free browser-based email validator and verifier — instant, accurate, no signup.
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