List Sorter & Filter
Sort, Filter & Transform Text Lists
10 powerful operations. Sort alphabetically, numerically, by length. Remove duplicates and empty lines. Shuffle, reverse, trim, and number lines. Undo history for easy experimentation. 100% client-side. Zero data stored.
List Sorter Tool
Input List
Select an Operation
Output
Common Use Cases
Clean Database Exports
Remove duplicate entries and empty rows from database exports. Perfect for cleaning up CSV data before importing.
Deduplicate Email Lists
Clean up email lists by removing duplicates and empty entries. Sort alphabetically for easier management.
Organize Code Dependencies
Sort package dependencies, imports, or CSS class lists alphabetically for cleaner, more maintainable code.
Randomize Quiz Questions
Shuffle quiz questions, flashcard sets, or any list that needs random ordering for fair testing.
Create Numbered Lists
Add line numbers to meeting agendas, to-do items, or documentation for easy reference.
Sort by Numeric Values
Natural sort for version numbers (v1.2, v1.10), scores, or any list with embedded numbers.
Operations Reference
Sort A-Z
Alphabetical ascending order. Enable case-sensitive for strict ASCII ordering.
Sort Z-A
Alphabetical descending order. Reverses the A-Z sort.
Numeric Sort
Natural number sort. Handles "item10" after "item2" correctly.
Sort by Length
Shortest to longest lines. Useful for finding outliers.
Remove Duplicates
Keeps first occurrence of each unique line. Case-sensitive option available.
Remove Empty Lines
Deletes blank lines and lines with only whitespace.
Trim Whitespace
Strips leading and trailing spaces from each line.
Reverse Order
Flips the list upside down. First becomes last.
Shuffle
Random order using Fisher-Yates algorithm for true randomness.
Number Lines
Adds line numbers. Multiple formats: "1.", "1)", "(1)", "01."
Frequently Asked Questions
Natural sort treats numbers within strings as numeric values rather than characters. For example, "item10" sorts after "item2" (not after "item1" as with alphabetical sort). This is perfect for version numbers, filenames with numbers, or any mixed alphanumeric data.
Case-insensitive sorting (default) treats "Apple" and "apple" as equal for sorting purposes. Case-sensitive sorting uses ASCII order, where all uppercase letters come before lowercase. Enable case-sensitive when you need strict ordering like "APPLE, Apple, apple".
Yes! The tool keeps a history of your last 10 operations. Click the Undo button or press Ctrl+Z to step back. The undo counter shows how many operations you can undo. This makes it safe to experiment with different operations.
By default, Remove Duplicates is case-insensitive, so "Apple" and "apple" are considered duplicates (keeping the first one). Enable the "Case-sensitive" option to treat them as different entries.
Four formats are available: "1." (dot), "1)" (parenthesis), "(1)" (brackets), and "01." (zero-padded). Zero-padded automatically adjusts to the number of digits needed, so a 100-line list uses "001." format.
The shuffle uses the Fisher-Yates algorithm, which produces an unbiased permutation. Every possible ordering has an equal probability of occurring. It uses the browser's crypto.getRandomValues() for better randomness when available.
Yes! Each operation takes the current output and applies the transformation. For example, you can: 1) Remove empty lines, 2) Remove duplicates, 3) Sort A-Z, 4) Add line numbers. Use Undo to step back if needed.
No. All processing happens entirely in your browser using JavaScript. No data is ever transmitted to any server. This means your information remains completely private. The tool works fully offline once the page is loaded.
Why We Built List Sorter & Filter
Working with lists is a daily task for developers, writers, and data analysts. Whether you're cleaning up a database export, organizing a contact list, or sorting dependencies in a package file, you need reliable tools that work instantly without requiring complex commands.
Many online list tools require you to copy data to external servers, raising privacy concerns especially when dealing with email addresses, customer data, or proprietary information. List Sorter & Filter processes everything locally in your browser - your data never leaves your computer.
We included the most common operations developers need: sorting (alphabetical, numeric, by length), cleaning (remove duplicates and empty lines), and transforming (shuffle, reverse, number lines). The undo history lets you experiment freely without fear of losing your original data.
List Sorter & Filter is part of RJL.io's collection of free developer tools - each designed to do one thing exceptionally well, with no accounts, no tracking, and no data collection. Check out our other tools: Text Case Converter, Diff Checker, Regex Tester, and more.