Free Online Email Validator
Validate email addresses and check format correctness. Supports single and bulk validation.
Key Features
Instant Validation
Validate email format instantly with real-time feedback as you type.
Bulk Mode
Validate multiple emails at once -- paste a list and see results for each address.
Detailed Results
Get clear valid/invalid status with specific error reasons for each email.
Privacy Protected
All validation runs locally in your browser. No data ever leaves your device.
Frequently Asked Questions
Getting Started
What is an email validator?
The Email Validator checks whether an email address conforms to the format defined by RFC 5322, the internet standard for email address syntax. It verifies that the address has a properly structured local part, an @ symbol, and a valid domain with at least one dot and a recognizable top-level domain. The tool runs entirely in the browser with instant feedback.
Is this email validator free?
Yes. All tools are completely free and run locally in your browser. No signup, no limits, no hidden costs.
Does the tool store my data?
No. Your email addresses never leave your browser. All processing happens locally on your device, ensuring complete privacy and security.
Features & Usage
Does this validator check if the email actually exists?
No, this is a format validator, not an existence checker. It tells you whether an address is structurally valid, not whether the mailbox actually exists or can receive mail. Use this for a fast first pass -- filtering out clearly broken addresses before passing the remainder to a paid SMTP verification service.
Why does the validator reject subdomain-only addresses like user@mail?
Per RFC 5322, the domain part must be a fully qualified domain with at least one dot (e.g., example.com). A bare hostname like mail without a dot is valid only on internal networks with DNS suffix resolution, but it is not a globally routable email address.
Does the validator detect disposable or temporary email addresses?
No. Disposable email services (Mailinator, Guerrilla Mail, etc.) use perfectly valid email formats, so they pass format validation. Detecting them requires checking the domain against a blocklist of known disposable providers.
How fast is bulk validation for large lists?
Bulk validation runs synchronously in the browser. For lists up to a few thousand addresses, results are nearly instant because each check is a simple regex test with no network I/O. Beyond 10,000 addresses you may notice a brief pause.