Remove duplicate email addresses from a list with free starter credits

Three steps to deduplicate your email list

1. Upload a CSV with the contact emails to the cleaner.
2. Keep Remove duplicate addresses checked, then click Clean & verify; eligible domain checks use your account credits.
3. Review the removed-rows CSV and download the cleaned output. The first occurrence of an address is retained.

What counts as a duplicate?

• The cleaner ignores letter case when comparing addresses: JOHN@example.com and john@example.com match.
• A different email address belonging to the same person is not automatically considered a duplicate.
• Gmail dot and plus aliases are not automatically merged in this build; removing those safely requires rules specific to the provider.

Combine duplicate removal with other rules

• You can also remove malformed email formats and optionally exclude known disposable or role-based email addresses.
• Suppression files subtract known bounced or unsubscribed addresses from the retained output.
• The original CSV remains unmodified on your computer; the cleaned result is a new download.

When duplicates are not the problem

• A clean-format address can still be an inactive or non-existent inbox.
• A duplicate-free list may still contain contacts who have opted out of marketing messages.
• Use the appropriate consent and suppression records regardless of the cleaning results.

Frequently asked questions