About Duplicate Line Remover
A focused website for one practical task.
Purpose
Clean pasted lists and line-separated data. Choose whether capitalization and outer spaces should matter; the first occurrence of each unique line is retained.
The tool is intended to work without accounts. In this starter version, calculations run in the browser and there is no form-submission backend.
Accuracy and limitations
The tool compares complete lines, not semantic equivalence or columns within a spreadsheet.
Formulas and assumptions are shown so visitors can review the result; no particular outcome is guaranteed.