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TEXT & WRITING

List Comparator

Paste two lists, one item per line, to see what's common to both and what's unique to each.

Tool statusRuns in your browser
Preview

In both lists (2)

Only in A (1)

Only in B (1)

Comparison is line by line. Empty lines are ignored.

How it works

  1. Enter your input

    Fill in the values, paste your text, or upload the file this tool works with.

  2. See results instantly

    Most tools update live as you type; a few use a single button. Either way, the result appears right on this page.

  3. Use your results

    Copy, download, or share what the tool produces — you're always in control of the output.

Privacy and processing — Runs locally in your browser. This tool does not upload your input.

What is List Comparator?

Paste two lists, one item per line, to see what's common to both and what's unique to each.

UNDERSTAND THE TOOL

How to compare two lists

How comparison works

Each list is treated as a set: item order and repeated lines don't affect the result. Empty lines are ignored.

Common uses

  • Compare two exported lists of usernames, emails, or IDs.
  • Check what changed between two versions of a list.

Limitations

Comparison is exact, item by item — it won't catch near-matches like extra whitespace inside an item or minor typos between otherwise-similar entries.

Calculation notes

All comparison runs in your browser; the lists you paste are never sent anywhere.

Frequently Asked Questions

Does it care about uppercase and lowercase?

By default, yes — "Apple" and "apple" are treated as different items. Turn on case-insensitive comparison to treat them as the same.

What happens to duplicate lines within one list?

They're treated as a single item, since each list is compared as a set.

Can I compare more than two lists at once?

Not directly — compare two at a time, or run the tool again using one list's "only in A"/"only in B" output as a new input.

Does it preserve original casing?

Yes. Even in case-insensitive mode, the output uses the first original line seen in each list.

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