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Find Duplicates

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About Find Duplicates

The Find Duplicates tool helps you identify repeated lines in a list instantly. Instead of removing duplicates, it shows every value that appears more than once and displays how many times it occurs. This makes it easy to spot repeated entries, review data quality issues, and find patterns in large datasets.

Simply paste your text and the tool will scan every line for duplicates. Results are grouped and counted automatically, so you can quickly see which entries appear most often.

This tool is useful for cleaning customer databases, reviewing keyword lists, auditing spreadsheets, analyzing log files, and checking imported data. Finding duplicates before making changes helps prevent mistakes and improves data accuracy.

Results are sorted by frequency, with the most common duplicates shown first. This helps important patterns stand out immediately and makes large lists easier to review.

Everything runs locally in your browser. Your data never leaves your device, and no account, login, or installation is required.

How to Use Find Duplicates

  1. Paste your list into the input — one item per line.

  2. Duplicates are listed automatically with their count, sorted by most frequent.

  3. Review the results to understand which values repeat.

  4. Use the Remove Duplicates tool to clean the list once you've reviewed it.

Examples

Example — Find repeated items
Input
apple
banana
apple
cherry
banana
apple
Output
3×   apple
2×   banana
Example — Duplicate email detection
Input
a@test.com
b@test.com
a@test.com
c@test.com
b@test.com
b@test.com
Output
3×   b@test.com
2×   a@test.com

Frequently Asked Questions

What does the output look like?

Each duplicate line is shown with its count, e.g. '3× apple'. Lines that appear only once are not included in the output.

How is this different from Remove Duplicates?

Find Duplicates shows you which values repeat and how many times — it's for auditing and reviewing data quality. Remove Duplicates cleans the list by eliminating repeated entries.

Is the comparison case-sensitive?

By default yes. Toggle case-insensitive mode to treat 'Apple' and 'apple' as the same value when counting.

Can I see the full frequency breakdown including items that appear once?

Use the Frequency Counter tool for that — it shows all unique values with their counts, including items that appear only once.

What is this tool good for in data analysis?

It's excellent for checking for duplicate SKUs in product catalogs, repeated emails in mailing lists, duplicate log entries, repeated tags in content exports, and duplicate IDs in database exports.

How are results sorted?

By frequency descending — the most frequently repeated items appear at the top, making it easy to spot the biggest data quality issues first.