Remove duplicate lines

Keep the first occurrence of each line using your rules.

How to use

Paste lines, choose case/whitespace matching and review the first occurrence of each line.

Try an example

Lines A, B, A become A, B.

Matching options change the definition of duplicates; first-seen order is preserved.

What should I check before using the result?

Matching options change the definition of duplicates; first-seen order is preserved.

Count words, lines and paragraphs in Arabic and English.

Count visible characters with and without whitespace.

Clean spaces, tabs and empty lines independently.