How remove duplicate lines works
Removing duplicate lines from a list is a common cleanup task for email lists, URLs, keywords, log files, and spreadsheet data. The tool reads the input line by line and keeps only the first occurrence of each unique line, discarding later repeats. The original order is preserved.
Three options control the behaviour. Case sensitive (default on) treats "Apple" and "apple" as different; turn it off to fold them together. Trim whitespace (default off) ignores leading and trailing spaces when comparing. Keep empty lines (default off) preserves blank lines instead of stripping them — useful when blank lines carry meaning in a document.
Paste your text and click Remove Duplicates. The tool reports the original line count, the unique count, and how many duplicates were removed. It keeps the first occurrence of each line and preserves the order they appeared, which is usually what you want for cleaned lists.