free tool
Bulk business email checker
Drop in a CSV export from your CRM or signup database. We find the email column, check every address in batches of 100 and give you a clean CSV back.
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faq
Bulk email checker: common questions
How many addresses can I check?
Batches of up to 100 are sent at a time and count toward your daily quota — 100 checks a day on a new free account, more on request.
Is my file uploaded?
No. The CSV is read in your browser and only the addresses are sent to the API, over HTTPS, in batches. Nothing is stored except the checked domains.
Why do I need to sign in?
Bulk checks run on your own free API quota, which keeps the public checker fast and stops abuse.