Remove Duplicate Lines
Remove duplicate lines from text while preserving the original order. Optionally trim whitespace and ignore case.
How to Use Remove Duplicate Lines
The Remove Duplicate Lines tool is a free online utility that eliminates repeated lines from your text while preserving the original order of unique lines. It is perfect for cleaning up data exports, removing duplicate entries from lists, deduplicating email addresses, cleaning log files, or preparing unique keyword lists. Options include trimming whitespace before comparison and case-insensitive matching. Simply paste your text with duplicate lines and get a clean, deduplicated version instantly. Handles large texts up to 100,000 characters. Essential for data analysts, developers working with CSV files, and anyone who needs to quickly clean up repetitive text data.
Step-by-Step Instructions
- Paste your text containing duplicate lines into the input area
- Optionally enable case-insensitive matching or whitespace trimming
- View the deduplicated text with only unique lines preserved
- Copy the cleaned text using the copy button
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