About the Duplicate Line Remover
Paste a keyword list, email export or log extract and strip repeated lines instantly. The first occurrence of each line is kept, so the original order survives the cleanup.
How to use it
- 1Paste the listOne item per line — no commas or formatting required.
- 2Choose matching rulesOptionally ignore case, trim surrounding spaces or drop empty lines before comparing.
- 3Copy the unique listThe result keeps the first occurrence of every line and reports how many duplicates were removed.
Why use this duplicate line remover?
- Nothing leaves your device. The work happens in your browser tab. There is no upload endpoint in this app, so your files and text cannot be stored, logged or seen by us.
- No upload wait. You skip the round trip to a server entirely. Results are limited by your own CPU, not by network speed or queue size.
- Free, no account, no quotas. No sign-up wall, no watermark, no daily limit. Optional accounts only exist to save favourites and presets across devices.
Frequently asked questions
Is my list safe to use here?
Yes. This tool runs entirely in your browser using JavaScript. Nothing you paste or open is sent to a server, and the page keeps no copy after you close it.
Do I need to create an account?
No. Every tool is fully usable without signing in. An account only adds saved favourites and reusable presets.
Does it work on a phone?
Yes. The interface is mobile-first with large touch targets and a stacked layout, so it works on phones and tablets as well as desktops.
Does it preserve the original order?
Yes. Unlike sorting-based deduplication, this tool keeps the position of the first occurrence of each unique line.
Can I remove duplicate words instead of lines?
This tool works on whole lines. To deduplicate comma-separated values, first use Find & Replace to turn commas into line breaks, then run the list through this tool.