List tool
Set Operations
Paste two lists, one item per line, and compare them.
About the Set Operations
Set Operations compares two lists and shows their union, intersection and differences. It helps when comparing email lists, product codes, customer IDs, keyword lists or class rosters.
Union (A ∪ B) contains all items from either list. Intersection (A ∩ B) contains items present in both. Only in A (A − B) and Only in B (B − A) show items unique to one list, and the symmetric difference shows items that are in exactly one of the lists. Items are compared as typed, so differences in capitalisation or spacing matter.
How to use it
- Paste list A, one item per line.
- Paste list B.
- Pick the operation.
- Copy the result.
Tips and good to know
- Trim spaces first for accurate matches.
- Convert to the same case before comparing.
- Use the intersection to find duplicates between lists.
Frequently asked questions
Are duplicates inside a list removed?
Results show unique items.
Is it case sensitive?
Yes.
How large can lists be?
Thousands of lines work fine.