What checks are performed?

Syntax validation, domain MX record existence, and disposable email detection.

Yes — common typos like gmail.con are flagged and a correction suggested.

No. Syntax checks run locally. Domain checks use a public DNS API.

Process files up to the browser memory limit.

Can I filter to only invalid emails?

Yes — toggle to show only invalid rows for easy cleanup.

Validate and flag invalid email addresses in a CSV column. Syntax and domain checks. The safest way to process sensitive data

Your files never leave your device. Processed locally. 100% private.

Unlocking Tool Engine...

Complete your task perfectly in just three straightforward steps.

Drop your CSV file containing an email column.

Choose which column holds email addresses.

Download the CSV with a new valid/invalid status column added.

Everything you need to know about the Email Validator.

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