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 Compare Four Lists

Compare four text lists at once and instantly identify unique values, overlaps between exact pairs, overlaps between exact triples, and values shared across all four lists. Paste your lists or upload TXT files, apply cleanup options, and export a complete comparison report in one click.

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⭐ About the Compare Four Lists Tool

The Compare Four Lists tool compares four line-based lists in one run. It helps you find unique values per list, exact overlaps between pairs, exact overlaps between triples, and values shared across all four lists.

⭐ What it does

After processing List A, B, C, and D, the tool creates 15 exact overlap groups:

  • Only in A, Only in B, Only in C, Only in D
  • In A and B only, In A and C only, In A and D only, In B and C only, In B and D only, In C and D only
  • In A, B and C only, In A, B and D only, In A, C and D only, In B, C and D only
  • In A, B, C and D

🔎 How to use

  1. Paste your values into List A, List B, List C, and List D, or upload four .txt files.
  2. Enable cleanup options like trim whitespace, ignore empty lines, and case-insensitive mode.
  3. Review each result block with its count.
  4. Use Copy or Download .txt to export the complete report.

🔎 Example

If one value appears in A, B and D but not C, it goes to In A, B and D only.

If a value appears in all four lists, it appears in In A, B, C and D.

If a value appears in only one input, it appears in that Only in X section.

⚙️ Options

  • Ignore empty lines - skips blank rows.
  • Trim whitespace per line - removes leading and trailing spaces.
  • Sort results alphabetically - sorts each group for easier reading.
  • Case insensitive - compares values without case differences.
  • Ignore double whitespaces - normalizes repeated spaces inside lines.

⚠️ Notes

  • All processing happens in your browser; no list data is uploaded.
  • The comparison is line-based and uses unique values per overlap group.
  • This tool is useful for multi-source audits, reconciliation, and deduplication workflows.

This tool is also known as

  • compare four lists online
  • 4 list comparison tool
  • find overlaps in four lists
  • common and unique values in 4 lists
  • difference checker for four lists

Frequently Asked Questions

It compares four line-based lists and groups each value by exact overlap: unique, pair-only, triple-only, or shared by all four lists.

You get 15 sections: 4 unique-only groups, 6 pair-only groups, 4 triple-only groups, and 1 all-four group.

Yes. You can upload one TXT file for List A, List B, List C, and List D.

Exact overlap means a value is placed only in the section that matches its true membership pattern across A, B, C, and D.

It compares values without letter case differences, so Example and example are treated as the same value.

It removes leading and trailing spaces from each line before comparison.

It replaces repeated spaces inside each line with a single space to reduce false mismatches.

Yes. Enable Sort results alphabetically to sort each section automatically.

Yes. Use Copy to copy all sections, or Download .txt to export the full report.

No. The tool runs fully client-side in your browser.

Yes. Any line-based list works, including emails, product IDs, URLs, usernames, and log values.

There is no fixed hard limit in the tool. Performance depends on browser memory and device speed for very large inputs.

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