Deduplicate a list
Paste one item per line to keep the first occurrence of each exact line. Later matches are removed without sorting the result.
This works for keyword lists, copied identifiers, URLs, email addresses, or log messages where exact repeats should appear once.
Exact matching
Comparison is case-sensitive and includes whitespace. Item, item, and Item are 3 different values.
Run a broader whitespace cleanup first when spacing differences should not make lines unique.
Blank lines
Blank lines are compared like any other line. The first blank line remains, and later identical blank lines are removed.