Jitbit's Free Email List Cleaner is a tool that helps clean up email lists by removing invalid emails, duplicates, typos, non-existing domains, malformed addresses, and more. It is an unlimited tool with a technical limit of 20,000 emails per cleaning session. The tool operates within your browser without sending email addresses to external servers, ensuring privacy. Jitbit is recommended for its simplicity and effectiveness in improving email campaign deliverability.