Example
[VALID] user@example.com
[INVALID] bad address@.com — …
Email Validator
Check whether an email address is well-formed and its domain looks valid, instantly in your browser. Free online email syntax validator — no uploads.
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- Email address(es) to validate — enter a value. A typical Email address(es) to validate would be user@example.com.
- Check that the domain looks like a real domain (has TLD) — enter a yes/no option.
- Review your results — the key output is highlighted, with supporting figures below.
Loading calculator…
Results
Validation report
| Detail | Value |
|---|---|
| Valid emails | |
| Invalid emails | |
| Addresses checked |
What is this calculator for?
Verify email addresses follow correct syntax and have a plausible domain before using them in forms or lists.
How to Use This Calculator
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- Email address(es) to validate — enter a value. A typical Email address(es) to validate would be user@example.com.
- Check that the domain looks like a real domain (has TLD) — enter a yes/no option.
- Review your results — the key output is highlighted, with supporting figures below.
What You'll Need
- Email address(es) to validate
- a value · required
- Check that the domain looks like a real domain (has TLD)
- a yes/no option · optional
About This Calculator
This email validator applies the common syntax rules for RFC 5322 local parts and domains: allowed special characters in the local part, a single @, and a domain made of dotted labels with a top-level domain.
It flags common problems (spaces, multiple @, missing TLD, over-long local part) and can check many addresses at once. Note that syntax validity does not prove the mailbox exists — only a delivery attempt can do that.
Validation runs locally in your browser.
Worked Examples
Frequently Asked Questions
Does VALID mean the inbox exists?
No. It only confirms the address is syntactically plausible. Only a successful delivery attempt can confirm a mailbox actually exists.
Are international (IDN) domains supported?
Basic Unicode domains may fail this ASCII-only regex. For IDN addresses, use punycode-normalized versions for validation.