How to Remove Duplicate Lines from a List (Free Tool)

Merged two lists and now there are repeats everywhere? Cleaning duplicates by hand is tedious and error-prone. Here's how to remove duplicate lines from any list in seconds.

Dedupe a list instantly

Paste your list into the duplicate line remover and it keeps the first occurrence of each line and drops the rest — showing you how many duplicates it removed.

Common uses

Cleaning email lists before a campaign, deduping keyword research, tidying exported data, and removing repeated entries from logs. Anywhere you have a line-per-item list, this saves real time.

Clean the list further

Combine it with the remove empty lines tool to strip blanks, and the A–Z sorter to put everything in order. Duplicates gone, blanks gone, sorted — in three clicks.

Turn it into other formats

Need the cleaned list as a single line? Use List to Comma Separated. Building a database query? That comma list drops straight into a SQL IN (...) clause.

Case sensitivity

The tool treats lines with different capitalisation as different by default, so normalise case first with the lowercase converter if you want "Apple" and "apple" treated as duplicates.