UseCase Solution

Clean Email Marketing Lists

Remove duplicate emails with exact or case-insensitive comparison while processing file contents locally.

100% Local Processing

Large File Ready

Instant Results

The Problem

Email lists grow with duplicates from multiple signup forms, imports, and campaigns. Bounces hurt your sender reputation. GDPR means you can't upload data to random online tools. Manual cleaning misses case and format variations.

Our Solution

Process file contents in your browser, compare emails exactly or while ignoring case and edge whitespace, and keep the most recent subscription date. Gmail dots and aliases are not changed.

Key Features

Features optimized for this use case

Case-insensitive comparison

Edge-whitespace comparison

Newest subscription retention

Keep recent subscription

100% local processing

GDPR compliant

How It Works

Complete data cleaning in three simple steps

Upload List

Import your email CSV

Deduplicate

Compare emails with selected rules

Export

Download for your ESP

FAQ

Common questions about this use case

Yes! All processing happens in your browser. No data is uploaded to any server. Your email list never leaves your device.

The tool does not remove Gmail dots or +aliases. It compares the address values using only the rules you select.

Yes! Use 'keep by oldest date' strategy with your subscription date column to preserve original signup dates.

Ready to Clean Your Data?

100% free. 100% local. Your data never leaves your browser.