What is the Email Validator tool?

The Email Validator tool lets you upload CSV files or paste email lists, validates each email using syntax rules, and separates valid and invalid addresses so you can clean your mailing lists.

How do I validate emails from CSV or text?

Select a CSV file and or paste your emails in the text box, then click Validate Emails. The tool processes both sources together, counts total, valid, and invalid emails, and shows them in separate tables.

Does the Email Validator upload my list to a server?

No. The Email Validator runs entirely in your browser using JavaScript. Your CSV file and pasted email list are not uploaded to any external server.

Can I download valid and invalid emails separately?

Yes. After validation, you can download valid and invalid email lists as separate CSV files, named with a neksiotool-email-validator prefix, and you can also copy valid emails to your clipboard.

What type of validation does this tool perform?

The Email Validator checks the format of each email address using a regular expression. It detects common syntax problems such as missing @ signs, invalid domain parts, and badly structured email strings.

Email Validator

Upload a CSV file or paste email lists, validate all addresses instantly, and export clean valid lists for campaigns.

Select CSV file (optional)

Paste email list

You can paste multiple emails separated by line breaks, commas, semicolons, or spaces.

The tool runs in your browser only. Your CSV and pasted emails are not uploaded to any server.

Validation Summary

Total Emails 0

Valid Emails 0

Invalid Emails 0

How Email Validator Works

Upload a CSV file with emails or paste your email list in the text box.
Click Validate Emails to process all addresses together.
Review total, valid, and invalid counts.
Download valid and invalid emails as CSV, or copy valid emails to clipboard.

#	Email Address
No data yet. Upload a CSV or paste emails, then click "Validate Emails".

#	Email Address	Reason
No invalid emails yet.

email validator

Email Validator

Validation Summary

How Email Validator Works

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email validator

Email Validator

Validation Summary

How Email Validator Works

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