Remove duplicate lines
Paste your list: repeated lines disappear and only the first occurrence of each one is kept. You can also ignore upper and lower case.
When you need a list without duplicates
Duplicates creep in everywhere: email lists merged from several spreadsheets (with the risk of sending the same newsletter twice), SEO keyword lists, discount codes, warehouse SKUs, columns exported from a CSV. This tool always keeps the first occurrence of each line, so the original order of your list never changes, only the later repetitions are dropped.
Upper and lower case: when to ignore them
For email addresses it's best to turn the option on: [email protected] and
[email protected] are the same mailbox, so they should count as duplicates. For
product codes, passwords, or technical identifiers, on the other hand, case can be
meaningful, leave the box unchecked. Either way, the line that is kept preserves its
original spelling, completely untouched.