Compare Text Lists — Common and Unique Items

How to use

1. Paste one item per line into List A and List B.
2. Choose common items, only A, only B, all unique items or items in only one list.
3. Set whitespace trimming and case matching options.
4. Review the counts and copy the result.

Set operations

The intersection contains items present in both lists. The A difference contains items from A that are absent from B; the B difference does the reverse. The union includes every unique item. The symmetric difference includes items found in exactly one list.

Results keep List A order first and append B-only items when the selected operation needs them. Empty lines are removed. With trimming disabled, surrounding whitespace becomes part of an item, so otherwise identical lines may compare differently. Case-insensitive matching uses ordinary lowercase conversion, not language-specific case folding. Accents and Unicode normalization forms are not changed: visually identical composed and decomposed strings can remain distinct.

Example

If A contains 사과, 中文 and 😀, while B contains 中文, 😀 and 배, their intersection is 中文 and 😀. Only A contains 사과, only B contains 배, and the union contains four items.

Limits and privacy

The combined input limit is one million characters. This is a set comparison tool, so it does not compare duplicate frequencies or track line moves like a diff viewer. Every operation runs in your browser without uploading or storing your lists.