Remove duplicate lines

Paste and duplicate lines disappear automatically. Comparison ignores surrounding whitespace; order follows first appearance.

How it compares

• Surrounding whitespace is ignored — "apple " and "apple" count as the same line.
• The first occurrence is kept and later duplicates removed, so original order is preserved.
• Blank lines are kept as separators.

Typical uses

Cleaning merged lists, stripping repeated lines from logs or notes, and deduplicating email or keyword lists. The removed count shows instantly, and everything runs in your browser.