Duplicate Line Remover
Paste a list, remove duplicate lines, and optionally sort the result.
Great for cleaning up email lists, keyword lists, or CSV columns pasted as plain text. Turn off case-sensitivity if "Apple" and "apple" should be treated as the same entry.
When would I need to remove duplicate lines?
Duplicate entries creep into lists in all kinds of situations: merging two spreadsheet exports, combining email lists from different signup forms, or pasting keyword research from multiple sources. Manually scanning a long list for repeats is slow and error-prone — this tool compares every line and keeps only the first occurrence of each unique entry.
A quick way to check list quality before importing
Beyond just removing repeats, running a list through this tool is a fast sanity check before importing it into a CRM, email platform, or database — most import tools either reject duplicate records outright or silently create messy duplicate contacts, so catching them beforehand saves a cleanup step later. Combining deduplication with the sort option also makes it easy to spot near-duplicates (like slightly misspelled entries) sitting next to each other once everything is in alphabetical order.
Frequently Asked Questions
Will this catch duplicates that have different capitalization, like "Apple" and "apple"?
By default, yes — the tool treats them as the same entry unless you turn on "case-sensitive" matching. This is useful for real-world lists where the same value might have been typed differently by different people.
Does the tool remove duplicates that appear anywhere in the list, or only consecutive ones?
It checks the entire list, not just neighboring lines. So if "banana" appears on line 2 and again on line 47, the second occurrence is still detected and removed — you don't need to sort the list first.
What happens to blank lines and extra spaces?
By default, leading/trailing spaces on each line are trimmed and empty lines are removed before comparing, since these are usually accidental artifacts of copy-pasting rather than meaningful data. You can turn either option off if you need to preserve the original spacing exactly.