Line Sort & Deduplicate

1. Paste or type your lines into the input area.
2. Choose a sort order from the dropdown (alphabetical, numeric, by length, or random).
3. Toggle options like "Remove duplicates", "Remove blank lines", or "Trim whitespace".
4. The output updates automatically as you type or change options.
5. Click "Copy" to copy the result to your clipboard.

What is Line Sorting and Deduplication?

Line sorting arranges lines of text in a specified order, while deduplication removes repeated lines so each unique entry appears only once. These operations are fundamental text processing tasks used by developers, data analysts, and system administrators to clean up and organize line-separated data. This tool combines both operations in a single interface with multiple sort modes (alphabetical, numeric, by length, or random shuffle) and options for trimming whitespace, removing blank lines, and case-insensitive comparison. All processing happens instantly in your browser.

How the Sorting Algorithms Work

Alphabetical sorting uses JavaScript's localeCompare for proper Unicode-aware string comparison, correctly handling accented characters and international text. Numeric sorting extracts the leading number from each line and sorts by its numeric value, placing non-numeric lines at the end. This prevents the common problem where alphabetical sort puts "10" before "2" because "1" comes before "2" in character order. Length-based sorting compares the character count of each line. Random shuffle uses the Fisher-Yates algorithm for uniform randomization. Deduplication uses a Set data structure for efficient O(1) lookup when checking for duplicate entries.

Common Use Cases

• Cleaning up word lists, glossaries, and vocabulary files
• Removing duplicate entries from CSV columns or database exports
• Sorting log file entries or error messages for analysis
• Organizing configuration file values (environment variables, hostnames)
• Randomizing quiz answers, playlist orders, or test data sets
• Preparing sorted input for diff comparison between two lists

Tips for Effective Line Processing

Enable "Trim whitespace" before deduplication to catch lines that differ only by leading or trailing spaces, since "hello" and "hello " would otherwise be treated as different entries. Use case-insensitive mode when deduplicating lists where capitalization varies (for example, "Error" and "error" should be treated as the same entry). The "Remove blank lines" option is useful when pasting data from spreadsheets or documents that include empty rows. For numeric sorting, ensure the number appears at the beginning of each line, since the sort extracts only the leading numeric value. When working with structured data, consider formatting it first with a tool like the JSON Formatter before extracting columns.

For comparing sorted lists, use the Diff Checker. For counting words and characters in your text, try the Word Counter. For generating placeholder text, see the Lorem Ipsum Generator.