Duplicate Email Remover

Duplicate Email Remover is a free online tool that instantly deduplicates your email list. Paste your addresses, click a button, and get a clean list with all duplicates removed — whether they differ by case, whitespace, Gmail aliases, or plus-tags.

Beyond basic deduplication, the tool offers alias-aware matching for Gmail and other providers, shows duplicate groups so you can see what was removed, provides breakdown stats, and supports sorting and multiple export options. Everything processes locally in your browser — your email list never leaves your device.

• Instant deduplication: Remove duplicate emails from lists of up to 50,000 addresses
• Case-insensitive matching: Treats User@Gmail.com and user@gmail.com as the same
• Gmail alias detection: Recognizes dots and +tags as the same address (j.doe+newsletter@gmail.com = jdoe@gmail.com)
• Plus-tag stripping: Detects +tag aliases for all providers, not just Gmail
• Duplicate groups view: See every group of duplicated emails with occurrence counts
• Keep first or last: Choose which occurrence to keep when duplicates are found
• Sort output: Alphabetical, by domain, or original order
• Remove invalid: Optionally strip emails with bad syntax while deduplicating
• Stats dashboard: Total, unique, duplicates removed, and percentage cleaned
• Export options: Copy clean list, copy duplicates only, or download as CSV/TXT

1. Paste your emails: Enter email addresses one per line, comma-separated, or semicolon-separated.
2. Set options: Toggle case-insensitive, alias-aware, strip +tags, or remove invalid syntax.
3. Click Remove Duplicates: The clean list appears instantly with stats showing how many were removed.
4. Review duplicates: Click 'Show Duplicate Groups' to see which emails had duplicates.
5. Export: Copy the clean list, copy only duplicates, or download as CSV/TXT.

Case duplicates:

Input: User@Gmail.com, user@gmail.com, USER@GMAIL.COM → Keeps 1, removes 2

Gmail alias duplicates:

Input: j.doe@gmail.com, jdoe@gmail.com, jdoe+news@gmail.com → All three are the same inbox, keeps 1

Mixed list:

Input: 100 emails with 15 duplicates → Output: 85 unique emails + report showing which 15 were duplicated

• Save on email costs: Most ESPs charge per subscriber — removing duplicates directly reduces your bill
• Prevent double-sending: Nobody wants to receive the same campaign email twice
• Smarter than basic dedup: Alias-aware matching catches duplicates that basic tools miss
• Audit before cleaning: Duplicate groups let you review what's being removed
• Fast processing: Handles tens of thousands of emails in seconds
• Private and free: No data uploaded, no sign-up, no limits