Contact-list cleanup
Remove exact repeats before importing a permission-based contact list into a CRM or email platform.
Remove Duplicate Email Addresses
Paste email addresses → Get a deduplicated list that keeps the first occurrence.
Clean an Email List
Cleaning exported contacts, signups, or a mailing list? Choose the current separator, then paste the addresses to remove exact duplicates.
Email List
Clean List
Process a list to compare the input count with the unique-address count.
How to Use Remove Duplicate Email Addresses
1
Paste Email List
Copy and paste your list of email addresses into the input box.
2
Choose Separator
Select how your emails are separated (comma, newline, semicolon, etc.).
3
Remove Duplicates
Click the button to instantly remove all duplicate email addresses.
4
Copy Clean List
Copy your deduplicated email list to use anywhere.
Remove Duplicate Email Addresses Features
- Supports newline, comma, or semicolon input
- Trims surrounding whitespace and removes empty entries
- Preserves the first-seen order of exact matches
- Outputs one retained entry per line for copying
Common Use Cases
Merge small exports
Combine small exports that use the same separator, deduplicate them, and then review the result for formatting issues.
Limits and Important Notes
How Email Deduplication Works
The tool splits the input with the selected delimiter, trims whitespace around every entry, and removes empty values.
A browser Set keeps the first exact string occurrence and ignores later identical entries. The resulting values are joined with newlines.
Formula
Unique output = first occurrence of each exact trimmed entry
Example
With Comma selected, “[email protected], [email protected], [email protected]” becomes two output lines: [email protected] and [email protected].
- Matching is case-sensitive, so differently capitalized addresses can remain separate.
- Mixed separators are not detected automatically.
- The tool does not validate address syntax or mailing consent.