Remove Duplicate Lines
Quickly remove duplicate lines from your text. Configure case sensitivity, whitespace trimming, and optional sorting.
How to Use Remove Duplicate Lines
- Paste your text — Enter or paste text with one item per line into the input area.
- Configure options — Toggle case sensitivity, whitespace trimming, and alphabetical sorting as needed.
- Click Remove Duplicates — The tool processes your text and shows the unique lines in the output area.
- Review stats and copy — Check how many duplicates were removed, then copy the cleaned result.
About Remove Duplicate Lines
Removing duplicate lines is a common task when working with data lists, log files, email lists, CSV exports, and any text-based datasets. Manual deduplication is tedious and error-prone, especially with large datasets containing hundreds or thousands of lines.
This tool automates the process by scanning each line and keeping only unique entries. The case-sensitive option lets you decide whether "Apple" and "apple" should be treated as the same or different entries. The trim whitespace option ensures that lines with trailing spaces are properly matched. Optional sorting arranges the output alphabetically, which is useful for creating clean, organized lists.
Frequently Asked Questions
The tool splits your text into individual lines, then keeps only the first occurrence of each unique line. Subsequent duplicate lines are removed. You can adjust the behavior with case sensitivity and whitespace trimming options.
When case sensitive is enabled, "Hello" and "hello" are treated as two different lines. When disabled, they are considered duplicates and only the first occurrence is kept in the output.
Yes, the original line order is preserved by default. The first occurrence of each unique line appears in the same position. You can optionally enable sorting to arrange lines alphabetically.
Yes. The tool runs entirely in your browser and can handle thousands of lines efficiently. For very large datasets (100,000+ lines), processing may take a moment depending on your device's performance.