List Validator

What this tool does

Validates lists of emails or URLs and quickly separates valid and invalid items. It is ideal for cleaning lists before importing or sending campaigns.

How it works

Paste the list (one item per line), select the type, and click Validate. The check runs locally in the browser and only the type and count are sent for quota tracking.

When to use

• Clean leads before importing into a CRM.
• Review campaign URLs or spreadsheets.
• Detect typos in large lists.

When to avoid

• If you need to confirm real email existence (SMTP/DNS).
• If you need to test whether the URL returns status 200.
• When the format is not standard email/URL.

Examples

• List of 500 emails -> quickly separate invalid entries.
• Spreadsheet of URLs -> find broken entries.

Quick recommendations

• Use one item per line and remove extra spaces.
• For larger volumes, enable bulk mode when available.
• After validation, manually review doubtful cases.

Limitations

• Validation is only syntactic; it does not confirm deliverability.
• No DNS, MX, or HTTP status checks.
• Per-run limits vary by plan and are shown above.

Privacy / where data is processed

Sent

Selected type and item count.

Retention

Content: 0 (we do not store it). Technical metadata: temporary retention.

Processing

In your browser.

Logs

IP, item count, timestamps, and errors.

FAQ

Does validation guarantee the email exists?

No, it only checks the format.

Can I export invalid items?

Yes, when bulk mode is active.

Is there an item limit?

Yes, it varies by plan.

Do the list items stay on the server?

No, they stay in the browser; only metadata is sent.