Why Use This Tool?
Email lists, keyword exports, log files, and scraped data all collect duplicate lines. This tool keeps the first occurrence of every line and drops the rest — with a counter that tells you exactly how many duplicates were removed.
The optional case-insensitive mode treats 'Apple' and 'apple' as the same line, which is what you want for email addresses and most keyword lists.
How It Works
- Paste your list — one entry per line.
- Choose case-sensitive or case-insensitive matching.
- Copy the deduplicated result and see how many lines were dropped.
Frequently Asked Questions
How do I remove duplicate lines from a list?
Paste the list above and click remove duplicates. The first occurrence of each line is kept in its original order; every later copy is deleted.
Does it treat APPLE and apple as duplicates?
Only when 'Ignore case when comparing' is checked — perfect for email lists and keywords. Unchecked, the comparison is exact.
Will my original line order be preserved?
Yes. Unlike sorting tools, this keeps the first-appearance order so your list stays exactly as you arranged it.
Tips & Things to Watch
- Trim-first is usually what you want — 'item ' and 'item' are the same entry.
- Pair with the Sort Lines tool after deduping for a clean alphabetical list.
- Large lists of thousands of lines process instantly.