Does the order of lines matter?

No. Lists are compared as sets. Results keep the order in which items first appear.

What does “Duplicates” show?

Lines that appear more than once across both lists combined — including lines repeated within one list.

Every distinct line from both lists, once — the union of A and B.

No. This tool runs entirely in your browser. Your text and files are never sent to a server or stored.

Paste the first list into List A and the second into List B — one item per line.
Choose what to show: common lines, only in A, only in B, all unique lines, or duplicates.
Matching ignores case and surrounding spaces by default; change that in the options.
Copy or download the result as TXT, CSV or JSON.

Before

List A: Apple, Banana, Orange
List B: Banana, Orange, Grape

After

Common: Banana, Orange
Only in A: Apple
Only in B: Grape

Each item is on its own line in the editors.

Comparison uses hash sets, so time grows linearly with the size of your lists. Comparing two lists of 100,000 lines takes a fraction of a second.

Your text is processed in your browser and kept only in this tab’s memory. It is not uploaded, saved or used for analytics.