Compare Two Lists

How it works

Every item in list A is checked against every item in list B. The result updates as you paste or type, and nothing is uploaded: it all runs in your browser, so lists of email addresses or customer names stay private.

Each button shows how many items it has, so you see the whole comparison at a glance before you pick one.

When two items count as the same

• Exact match by default: “Apple” and “apple” are different items. Turn on Ignore case to treat them as the same.
• Spaces: with Ignore extra spaces on, spaces at the start and end don’t count, and two spaces in a row count as one. “anna@example.com “ with a trailing space matches “anna@example.com”. Zero-width characters, which you can’t see but often come along when you copy from websites and chat apps, are ignored too.
• Accents: “é” typed as one character and “é” built from “e” plus an accent mark count as the same.
• Empty lines are skipped.

When the two lists spell a shared item differently, In both shows it as list A spells it.

Repeated items

An item that appears twice in the same list is compared once and listed once. The count beside each list says how many items it has and how many of them are repeats, like “8 items, 2 repeated”. To clean the repeats out of one list, use Remove Duplicate Lines.

Lists on one line

Each new line starts a new item. If you paste a list like “apples, bananas, cherries”, the tool offers to split it: Split at commas and tabs also splits at semicolons. Leave it off for items that contain commas, like “Smith, John”.

Order

Results keep the order of the list they come from. Merged puts list A’s items first, then the items only list B has. A to Z and Z to A sort numbers the way people expect: “item 2” comes before “item 10”.