Delete repeated lines from a list while keeping the original order.
Remove duplicate lines from any list — emails, URLs, keywords, IDs — while preserving the original order. Match loosely (ignoring case and spacing) or exactly, and keep the first or last occurrence. Shows how many duplicates were removed.
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The first occurrence is kept and later repeats are removed, with the original order preserved. That is usually what you want for lists where earlier entries came from a more trusted source, and it means the output reads in the same sequence as your input rather than being resorted.
By default, lines that match exactly. Enabling the case-insensitive and whitespace-trimming options catches the near-misses that cause most real problems — Email@example.com against email@example.com, or entries with a trailing space copied from a spreadsheet. Those look identical to a human but not to a strict comparison.
Cleaning email and subscriber lists before import, deduplicating URLs for a crawl or sitemap, tidying keyword research exports, and merging lists from several sources. Anywhere you have concatenated files together, duplicates are almost guaranteed, and most systems will either reject the import or double-count.
Yes, Remove Duplicate Lines is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.
Remove Duplicate Lines runs entirely in your browser. Your file is never uploaded — it is read, processed and saved locally, so it never reaches our servers or anyone else's. You can disconnect from the internet after the page loads and it still works.
Keep which copy
Order is preserved: Lines stay in their original order — this is a de-duplicator, not a sorter. Keep the first occurrence, or the last if later entries are the more recent ones.
Loose vs exact matching: Ignoring case and whitespace catches the duplicates that matter in real lists (emails, tags, SKUs) where " Alice@Example.com" and "alice@example.com" are the same thing. Switch to exact matching when case is meaningful, such as code identifiers.
Blank lines: Blank lines are left alone rather than being collapsed into one, so your grouping survives. Use Remove Extra Spaces if you also want those tidied.
Privacy: Runs entirely in your browser. Safe for customer lists, exported data and anything else you would not paste into a server-side tool.