linesdedupe Free · private · in your browser

Paste · dedupe · done

Unique Lines Only

Keep one copy of every line and drop the rest. This page is tuned for “unique lines only”: fast, local, and no data leaves your browser.

Remove Duplicate Lines

on-device
Options

Input

Output

Paste on the left and the clean list shows up here — instantly.

⌘/Ctrl + Enter dedupe & copy · Esc leaves the box · / jumps in

0 in → 0 unique · 0 removed

nothing leaves your device

How to get unique lines only

  1. Paste the list you want to shrink.
  2. Leave Keep first occurrence selected to preserve the original order of first appearances.
  3. Turn on Ignore case so Apple and apple count as the same line.

Unique lines vs. all duplicates

This page returns unique lines only — the deduplicated result. If you want the opposite (show only the lines that appeared more than once), use your browser's search on the output, or ask for that mode in the dedupe tool.

Common uses

Extract unique SKUs, tags, domains, keywords, or IDs from an exported list. The live counter shows how many lines were removed, so you can sanity-check the result before copying.

Related: remove duplicate lines online · compare two lists · remove duplicate lines