Upload a CSV to find duplicates, invalid addresses, disposable email domains, and suppressed contacts — before you send. First 1,000 rows free, no account needed.
Drop your CSV here, or click to browse
One email per row, or a CSV with a named "email" column — up to 50,000 rowsChecks to run:
Yes. The first 1,000 rows are always free with no account or sign-up required. The results page, all downloads, and every check are included.
No. Your data is processed in memory on the server and discarded the moment your results are returned. Nothing is written to disk, no database, no logs containing your addresses. This tool is GDPR-safe by design.
The suppression list contains email addresses and domains known to produce hard bounces, spam complaints, or abuse reports. Sending to these contacts damages your sender reputation with ESPs like Mailchimp, SendGrid, and Brevo. We flag any matches so you can remove them before sending.
Disposable or temporary email addresses are created by services like Mailinator, Guerrilla Mail, and YOPmail. They expire after minutes or hours and almost never represent a genuine subscriber. Sending to them wastes quota and can trigger spam filters.
Upload a CSV file — either a single column of email addresses, or a multi-column file with any headers. If your file has a column named email, we detect it automatically. Otherwise you can select the right column after uploading.
Yes. All original columns from your CSV are preserved in every download. The full report adds status and reason columns on the right. Your clean list download contains only rows that passed all checks, with original columns intact.
Email list hygiene is the practice of regularly removing invalid, duplicate, and unengaged addresses from your mailing list. Poor list hygiene leads to high bounce rates, spam complaints, and eventual blacklisting of your sending domain. Most ESPs will suspend accounts that exceed a 2% hard bounce rate. Running your list through a checker before each campaign keeps your sender reputation healthy.