# Duplicate Line Remover

Keep the first occurrence of each line with optional case and whitespace rules.

[Open this tool](https://whatson.pk/developer-text-dedupe-calculator/)

Category: Developer & Data

Repeated lines can be literal duplicates or differ only in spaces and letter case.

Choose the matching rules that fit the list and review which first occurrences remain.

## Inputs and controls

* Text lines
* Letter case: Case sensitive; Ignore case
* Line edges: Trim edges; Keep edges
* Blank lines: Remove blank lines; Keep first blank line

## How to use

* Paste or enter text lines.

* Choose letter case, line edges and blank lines.

* Select Process input. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

Keeping the first occurrence gives a predictable basis for cleaning repeated entries.


## Before relying on the result

If case matters to the identifier, keep case sensitivity enabled and check the retained list.

## Questions

### Can case insensitive matching remove distinct codes?

Yes. If case matters to the identifier, keep case sensitivity enabled and check the retained list.

### What should I check before using Duplicate Line Remover?

Check Text lines, Letter case, Line edges and Blank lines. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T16:58:29+00:00

This profile describes the tool. It does not execute it or supply a professional certification.