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Compare Two Lists

100% Free

Compare two line lists — only in A, only in B, intersection, union, or symmetric difference. Case and trim toggles.

Real-time
Client-Side
5 modes
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Compare mode
Result (0 lines)
Comparison result appears here…

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<iframe
  src="https://tools.town/embed/list-compare/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Compare Two Lists">
</iframe>

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How to Use

  1. 1 Paste list A and list B — one item per line
  2. 2 Pick a mode — only A, only B, intersect, union, or symmetric diff
  3. 3 Toggle case-sensitivity and trim if needed
  4. 4 Copy the result

Features

  • Five set operations on line lists
  • Dedupes each side before comparing
  • Case-sensitive or insensitive
  • Trim + blank-line handling
  • Runs entirely in your browser

Why it Matters

Finding what changed between two exports — CRM vs mailer, old sitemap vs new — should not require a spreadsheet VLOOKUP. Paste both lists and pick the set operation.

★★★★★

Use Cases

ID column diffs

Find IDs present in export A but missing from B

Merge uniques

Union two lists into one unique list (A order first)

Overlap check

Intersection of two email or keyword lists

Frequently Asked Questions

Does union keep order?
Yes — all unique lines from A in order, then lines from B that were not in A.
Are duplicates within a list counted?
Each list is deduped first (first occurrence wins), then compared.
📖

Want to go deeper?

Browse all guides →
How to Compare Two Lists Onlin
compare

How to Compare Two Lists Online

Compare two line lists with only-A, only-B, intersect, union, or symmetric difference using Tools.Town List Compare.

14 Aug 2026

5 min read

List Ops
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List Ops — Sort, Dedupe, Split & Clean Lists Online

The Tools.Town List Ops cluster: sort ascending/descending, remove duplicates, split into chunks, compare two lists, and format bullets — free, in-browser.

14 Aug 2026

5 min read

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