About this duplicate line remover
Remove repeated lines while preserving their first occurrence. Lines are compared exactly, including case and spaces. The first occurrence of each distinct line is kept. Work directly with your own text in this browser without signing in or uploading a document. Review the result before copying it into another application, and use Reset to clear the workspace when you are finished. The examples below show the exact behavior to expect, while the limitations explain cases where another workflow may be more suitable.
How the duplicate line remover works
Lines are compared exactly, including case and spaces. The first occurrence of each distinct line is kept.
Duplicate Line Remover examples
red blue red
red blue
A a A
A a
Limitations & privacy
Case and leading or trailing spaces matter. CRLF and CR line endings are normalized to LF; empty lines are deduplicated too. Maximum text input: 100,000 UTF-16 units.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
Duplicate Line Remover: frequently asked questions
How does the duplicate line remover work?
Lines are compared exactly, including case and spaces. The first occurrence of each distinct line is kept.
What can I inspect in the duplicate line remover result?
The duplicate lines removed helps you check the result before using it. Case and leading or trailing spaces matter. CRLF and CR line endings are normalized to LF; empty lines are deduplicated too. Maximum text input: 100,000 UTF-16 units.
Does the duplicate line remover upload my input?
Processing happens in your browser. No tool input or output is uploaded to a server. Use Reset to clear the current workspace before starting a separate task.
Updated September 20, 2026