Sort
Sort list items in specified order
Duplicate
World's simplest browser-based utility for duplicating list items. Input your list and specify duplication criteria to create copies of items. Perfect for data expansion, testing, or creating repeated patterns.
List Tools
List Duplication
This tool allows you to duplicate items in a list. You can specify the number of copies (including fractional values), control whether items are concatenated or interweaved, and even reverse the duplicated items. It's useful for creating repeated patterns, generating test data, or expanding lists with predictable content.
Input List
Duplicated List
Tool options
Split Options
Split by Symbol
Split by Regular Expression
Duplication Options
Concatenate copies (if unchecked, items will be interweaved)
Reverse the duplicated items
Duplicate Examples
Simple duplication
This example shows how to duplicate a list of words.
Input
Hello World
Hello World
Output
Hello World Hello World
Hello World Hello World
Split Options
Split by Symbol
Split by Regular Expression
Duplication Options
Concatenate copies (if unchecked, items will be interweaved)
Reverse the duplicated items
Reverse duplication
This example shows how to duplicate a list in reverse order.
Input
Hello World
Hello World
Output
Hello World World Hello
Hello World World Hello
Split Options
Split by Symbol
Split by Regular Expression
Duplication Options
Concatenate copies (if unchecked, items will be interweaved)
Reverse the duplicated items
Interweaving items
This example shows how to interweave items instead of concatenating them.
Input
Hello World
Hello World
Output
Hello Hello World World
Hello Hello World World
Split Options
Split by Symbol
Split by Regular Expression
Duplication Options
Concatenate copies (if unchecked, items will be interweaved)
Reverse the duplicated items
Fractional duplication
This example shows how to duplicate a list with a fractional number of copies.
Input
apple banana cherry
apple banana cherry
Output
apple banana cherry apple banana
apple banana cherry apple banana
Split Options
Split by Symbol
Split by Regular Expression
Duplication Options
Concatenate copies (if unchecked, items will be interweaved)
Reverse the duplicated items
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