Tools

Duplicate Line Finder for Text Lists

Find repeated lines in text to clean lists and datasets.

Duplicate Line Finder

Find repeated lines in text to quickly clean lists and exports. This is useful for deduplicating email lists, tags, or IDs.

How to use the Duplicate Line Finder

  1. Paste the text with one item per line.
  2. Click Find Duplicates.
  3. Review the duplicate list.

Common use cases

  • Cleaning imported CSV lists.
  • Removing duplicate IDs or tags.
  • Auditing exports before upload.
  • Comparing lists for overlaps.

Tips & notes

  • Normalize whitespace before checking for duplicates.
  • Convert to lowercase if you want case-insensitive results.
  • Keep a backup of the original list.

Related text tools

  • Whitespace Normalizer
  • Text Similarity Checker
  • Word Frequency Analyzer

FAQ

Case sensitive?
Yes. Lines are compared as-is.
Does it ignore whitespace?
No. Leading and trailing whitespace are considered.
Does it show counts?
Yes. It reports how many times each duplicate appears.