Count Duplicates Online | Duplicate and Unique Values
Count duplicates online from any list or column. Find repeated items, unique values, duplicate lines, occurrences, and copy or export the result.
How do I count duplicates online in a list?
Paste a list with one value per line and press count duplicates. The tool shows how many times each value appears and separates unique, repeated, and duplicate values.
Can I count unique values online?
Yes. The tool counts how many unique values exist and also creates a list where each value appears only once.
Can I count duplicates ignoring uppercase and lowercase?
Yes. Turn on ignore uppercase/lowercase so values like Hello, hello, and HELLO count as the same item.
Is the text sent to a server?
No. The counting happens in your browser.