Q: What does "Case Sensitive" mean?
A: When enabled, "Apple" and "apple" are treated as different lines. When disabled, they are considered duplicates.
Q: What happens to empty lines?
A: If "Keep Empty Lines" is unchecked, all empty lines are removed. If checked, only one empty line is kept.
Q: What does "Trim Whitespace" do?
A: It ignores leading and trailing spaces when comparing lines. " Apple " and "Apple" would be considered duplicates.
Q: Can I undo my last action?
A: Yes! Click the "Undo" button or press Ctrl+Z (Cmd+Z on Mac). Last 10 actions are saved.
Q: Are there keyboard shortcuts?
A: Yes! Press Ctrl+Enter (Cmd+Enter on Mac) to clean duplicates, and Ctrl+Z (Cmd+Z) to undo.
Q: Is my data safe?
A: Absolutely! This tool runs entirely in your browser. No data is sent to any server.