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Compare two lists

Got two lists and need to know what doesn’t match? Paste them below. You’ll see what shows up only on the left, only on the right, and what’s in both.

Decide what A and B mean

Before you paste, be clear about each side—for example “yesterday’s export” vs “today’s,” or “people I follow” vs “people who follow me.” If you mix them up, the results still look fine, but you’ll unfollow (or fix) the wrong people.

  • Put one name, email, or ID on each line.
  • If the paste looks messy, leave “trim” and “ignore empty lines” on.

After you hit Compare

  1. Intersection — items in both lists. If this is empty, something is probably off with formatting.
  2. A only / B only — the real differences you usually care about.
  3. Duplicates — repeats inside one list that can throw off your counts.

Want a longer walkthrough? Read the guide or open the tool on the homepage.

Paste your lists here

List A
0 lines
List B
0 lines
Click “Compare lists” to generate results.

FAQ

What’s the fastest way to compare two lists?

Paste both sides, leave the defaults, click Compare lists, then check A only, B only, and Intersection.

Can I paste from Excel or upload a CSV?

Yes. Paste from Excel, or upload TXT, CSV, or JSON. If each row has several columns, use first-column mode so you only compare the ID.

Why do I get almost no matches?

Extra spaces and capital letters are the usual culprits. See tips for Excel paste.

Also see: reading the difference tabs · what each option means