Is matching case-sensitive?

Configurable. By default it is case-insensitive, so 'Apple' and 'apple' count as duplicates.

Does it handle blank lines?

Blank lines can be stripped with the 'Remove empty lines' option.

No. All processing happens in your browser. Nothing is sent to a server.

Paste any block of text to remove duplicate lines. Options include case-sensitive matching, trimming whitespace, and stripping empty lines.

no-upload

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