Dedupe Email Lists

Clean up email lists before importing into Mailchimp, SendGrid, or other ESPs.

Hakuna kuingia kinachohitajika

Ignore caseTrim whitespaceIgnore empty lines

Input (one item per line)

Occurrence counts

Output will appear here…

Email Lists tips

📧

Most ESPs charge per subscriber and reject duplicates anyway. Dedupe before importing to save credits and prevent errors.

💡

Enable "Ignore case" — Alice@Example.com and alice@example.com are the same address.

🎯

Use "Count occurrences" mode first to see if you have a few duplicates or thousands — gauges the data quality.

Ingiza

Enter your data into the tool above. Everything stays local to your browser.

Chakata

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Pakua

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

✓Bure kabisa — bila gharama zilizofichwa, kamwe

✓Hakuna akaunti, barua pepe, au kuingia kinachohitajika

✓Faili hazitoki kwenye kifaa chako kamwe

✓Hakuna kikwazo cha ukubwa wa faili kabisa

✓Hakuna alama za maji kwenye matokeo yoyote

Clean Data Before Analysis

Find duplicate rows in CSV exports or database dum

Identify Repeats in To-Do Lists

Spot duplicate tasks in long to-do lists or projec

Count Word Frequency

Paste a list of words/keywords to see which appear

Find Repeated Commit Messages

Paste a git log to find authors' habitual commit m