📌 Overview

Remove duplicate lines from any text while keeping the first occurrence. Optionally ignore blank lines and trim whitespace. Great for cleaning lists, logs, and CSV data.

🧹 Duplicate Line Remover

Remove duplicate lines from any text while keeping the first occurrence. Optionally ignore blank lines and trim whitespace. Great for cleaning lists, logs, and CSV data.

Your List (one per line)

Ignore blank lines Trim spaces

Paste a list and click Remove Duplicates.

🔒 All processing happens in your browser. No data is uploaded to any server.

📋 How to Use

Paste your list into the box (one item per line).
Toggle "ignore blank lines" and "trim spaces" as needed.
Click "Remove Duplicates".
Copy the cleaned, unique list.

❓ FAQ

Does it keep the first or last occurrence?

It keeps the first occurrence of each line and removes later duplicates, preserving your original order.

Can it ignore blank lines?

Yes. Enable "Ignore blank lines" to drop empty lines before deduplicating.

Is the comparison case-sensitive?

By default yes. Lines differing only in capitalization are treated as different; trimming helps normalize them.

❓ More Questions

Does it keep the first or the last occurrence?

It keeps the first occurrence of each line and removes later duplicates, preserving your original order.

Can it ignore blank lines?

Yes - tick ignore blank lines to drop empty lines before deduplicating.

💡 Use Cases

📋

Clean Lists

Deduplicate email or name lists quickly.

📜

Log Files

Strip repeated entries from exported logs.

🗂️

CSV Prep

Normalize rows before importing into a sheet.

🔗 Related Tools

📖 Deep Dive: Duplicate Line Remover

Why remove duplicates

Lists, logs, and keyword tables often pick up duplicate entries that waste space and skew analysis. Line-by-line deduplication is one of the most common data-cleaning steps.

How it works

The tool splits the text into lines and keeps a set of lines already seen; duplicates are skipped so only the first occurrence is kept, preserving the original order.

A quick example

Paste a 500-line email list, enable ignore blank lines plus trim spaces, and get 480 unique emails in one click - avoiding duplicate blasts.