How to Use the Duplicate List Finder
Paste your list with one item per line, and this tool finds duplicate entries case-insensitively, showing how many times each one appears. For example, 'Apple', 'apple', and 'APPLE' are all treated as the same item and grouped together as duplicates. It's useful for quickly catching accidental repeats in email address lists, member name lists, keyword lists, or reference lists.
The list is analyzed in the order you entered it rather than being re-sorted, but if you already have an alphabetized list, running it here makes adjacent duplicates even easier to spot visually. Blank lines are automatically excluded, and leading/trailing spaces on each line are trimmed before comparison.
Frequently Asked Questions
No, comparison is case-insensitive. For example, Apple and apple are treated as the same item and flagged as duplicates.
No, it analyzes the list in the order you entered it. Using it on an already alphabetized list makes it easy to spot adjacent duplicates visually as well.
Blank lines are automatically excluded, and leading/trailing spaces on each line are trimmed before comparison.