Enter Content: Type, paste, or upload the content you want to process, or use sample data for testing.
Adjust Options: Configure relevant options and parameters to customize the processing method.
Get Results: Copy the result or click download to save. All processing is done locally — no data is uploaded to any server.
No. This tool performs syntax format checking using regex and RFC 5322 standards to identify malformed email addresses. However, format validation only ensures structural correctness — it cannot verify if the mailbox actually exists or can receive emails. To confirm real validity, a verification email needs to be sent.
Standard email format: local-part@domain.tld. Supports alphanumeric usernames, dots (.), underscores (_), percent signs (%), plus signs (+), hyphens (-), and other common special characters. Domain part supports standard domains, subdomains, and internationalized domain names (IDN). Includes common typo detection (e.g., gamil.com → gmail.com, hotnail.com → hotmail.com).
Batch mode supports one email per line. We recommend no more than 1000 at a time. The tool analyzes each line and displays validation results (valid/invalid) with error reasons for quick troubleshooting.
No. This tool runs entirely in your browser — all email validation happens locally on your device. Your email data is never transmitted or stored on any server, ensuring complete privacy.
Common errors include: missing @ symbol, no dot in domain, illegal characters, malformed domain (consecutive dots, leading/trailing dots), address too long (over 254 characters), improper quote usage, etc. This tool provides detailed error reasons for each validation failure.