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Compare Two Lists

Find common items and differences between two lists of lines.

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How do you compare two lists?

Two inboxes, two exports, one question: what overlaps? Paste one list per box and get three buckets — shared items, items only in A, items only in B. Lines are trimmed and de-duplicated before matching, and comparison is exact, including case. Since the diff happens on your own machine, client lists and email addresses never leave it.

How to use the Compare Two Lists

  1. 1 Fill List A with your first set, one entry per line.
  2. 2 Fill List B with the set to compare against.
  3. 3 Read the three output groups: in both, A only, B only.
  4. 4 Copy just the group you came for.

What you can use it for

  • Finding emails common to two mailing lists.
  • Spotting which items were added or removed.
  • Comparing two sets of SKUs or IDs.
  • Checking overlap between keyword lists.

Frequently asked questions

Is “Apple” in List A the same as “apple” in List B?
No. Matching is exact after trimming, so case differences keep items apart. Run both lists through a lowercase converter first for a case-blind comparison.
One list has the same email three times. Does that skew the result?
No. Each list is reduced to unique entries before comparing, so triplicates count once and the three output groups never show repeats.
Do trailing spaces stop items from matching?
They would, so each line is trimmed at both ends before comparison. “ widget ” and “widget” therefore match; only differences inside the text keep items apart.

Related tools

Remove Duplicate Lines Delete repeated lines from a list while keeping the original order. Sort Lines Sort lines alphabetically or by length, ascending or descending, with optional de-duplication.

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