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Deduplicate Lines

Remove duplicate lines from a list. Case-sensitive toggle, trim before compare, keep first or last, optional sort.

Free No signup Client-side Privacy friendly

How to use

  1. 1 Paste a list with one item per line.
  2. 2 Tune the comparison: case-sensitive, trim whitespace before compare, keep first or last duplicate.
  3. 3 Optional: sort output alphabetically.
  4. 4 Copy the deduped list.

Why use this tool

  • Original order preserved by default — no surprise sort.
  • Case-insensitive option folds Apple, apple, APPLE into one entry.
  • Trim option ignores leading and trailing whitespace differences.
  • Counter shows exactly how many lines were removed.

Frequently asked questions

Are blank lines treated as duplicates?

Yes — multiple empty lines collapse to one. If trim is on, lines that are just whitespace also fold together.

What does Keep last do?

Default Keep first drops every duplicate after the initial occurrence. Keep last drops earlier occurrences and keeps the final position — useful when later entries have more recent data.

How is the comparison done with case-insensitive?

Lines are lowercased only for the lookup key; the output preserves the original casing of the kept line.

Related tools?

Use Sort Lines to also sort the result by length or numeric value, or Filter Lines to keep only lines matching a pattern.

Summary

Deduplicate Lines is a free creator utility by Zerethon Tools. Remove duplicate lines from a list. Case-sensitive toggle, trim before compare, keep first or last, optional sort. Runs entirely in the browser — no signup, no upload.

Category
Creator
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. Deduplicate Lines runs entirely client-side — no server upload, no logging, no tracking of your input.

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