Duplicate Line Remover

About this tool

Lines are compared as whole strings — the first time a line is seen it's kept, and every later line that matches it (under the options you've chosen) is dropped, preserving the original order of what remains. "Ignore leading/trailing whitespace" trims each line before comparing, so foo and foo count as the same line, but the version you kept still has its original spacing intact.

Nothing you paste here is sent to a server — the entire tool runs as JavaScript in your browser tab.