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List duplicator

World's simplest list tool

This is a super simple browser-based application that duplicates a list and makes multiple copies of its items. When you duplicate the input list, all its items are copied and appended at the end of the original list. For example, you can create two copies of a list, three copies of a list, or even a fractional amount of copies of the original input list, such as 5.5 copies or 7.75 copies. It works with any list format as you can adjust the input item separator and also you create a new output list format by setting a new output list item separator. Created by list geeks from team Browserling.
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Item Delimiter
Use a character to separate list items. (Default.)
Use a regexp to separate list items. (Advanced.)
Use this field to enter the delimiting symbol or the delimiting regular expression.
Join items in the duplicated list with this symbol.
Duplication Method
Append a copy of all list items at the end of the given list.
For example, if the list "a, b, c" is duplicated two times, you will get "a, b, c, a, b, c".
Copy each item individually and put it next to the same item in the given list.
For example, if you interweave the list "a, b, c", you will get the list "a, a, b, b, c, c".
Number of Copies
Number of copies of the list.
The copy count can be fractional. For example, 2.5 will create two and a half copies of the list.
Copy the items in reverse order.
List duplicator tool What is a list duplicator?
This online tool creates copies of items of textual, symbolic, and numeric lists. Once you load a list in the input, you'll instantly get as many copies of the same list as you requested in the output. The number of copies is defined in the options and can be either an integer or a fraction. If the quantity is an integer, then you will get exactly that number of lists with all the items in the output. For example, if the input list is "a, b, c", and the copy count is 3, then you will get "a, b, c, a, b, c, a, b, c" in the output. If the quantity is a fraction, then you will get the number of copies equal to the integer part of the quantity plus the sliced part of the list with the number of items equal to the fractional part of the quantity. For example, if the input list is "w, x, y, z", and the copy count is 2.5, then the output list will be two copies of "w, x, y, z" plus a half which is "w, x", so the final output list will be "w, x, y, z, w, x, y z, w, x". By default, the program uses the concatenation mode. This means that duplicated list items will appear at the end of the original list. There is also the interweave mode. In this mode, each duplicated item will appear next to the original item. For example, if you interweave the list "a, b, c" twice, then it will become "a, a, b, b, c, c". Also, you can add a reverse copy to the list using the "Reverse Duplication" mode. In this case, the list "a, b, c" will become "a, b, c, c, b, a" in concatenation mode and it will become "a, c, b, b, c, a" in interweave mode. The interweave mode is also known as the zip mode or the zip operation as it acts as a zipper. To make the tool correctly recognize items in a list, you need to specify the separator that goes between the items. If it's the same character (such as a comma or a space) or string (such as a pattern), use the "Symbol Delimiter" split mode. If it's a changing/dynamic character or string (such as a mix of various symbols), use the "RegExp Delimiter" split mode. After duplicating the list, the items of the new list will be concatenated via the output list item separator symbol that you can also change in the options. Listabulous!
List duplicator examples Click to use
Duplicate a Price List
In this example, we duplicate a price list from a clothing store. We specify the input item delimiter to be the newline symbol, create two copies of the list, and join them also with a newline symbol.
Elegant suit....$600 Coat............$545 Casual shirt....$99 Summer dress....$270 Stylish skirt...$540 Exquisite hat...$80 Handbag.........$400 Shoes...........$260
Elegant suit....$600 Coat............$545 Casual shirt....$99 Summer dress....$270 Stylish skirt...$540 Exquisite hat...$80 Handbag.........$400 Shoes...........$260 Elegant suit....$600 Coat............$545 Casual shirt....$99 Summer dress....$270 Stylish skirt...$540 Exquisite hat...$80 Handbag.........$400 Shoes...........$260
Required options
These options will be used automatically if you select this example.
Use a character to separate list items. (Default.)
Use this field to enter the delimiting symbol or the delimiting regular expression.
Join items in the duplicated list with this symbol.
Append a copy of all list items at the end of the given list.
Number of copies of the list.
Copy the items in reverse order.
Generate 3.33 Copies of a List
In this example, we make 3.33 (three and one-third) copies of the Greek Gods list. As the elements of the input list are separated by commas, spaces, tabs, and newlines, we use the regex "/,\s+|\n+/g" to match all possible separators. As a result, we get three whole lists and another 33% of the original list.
Apollo, Aphrodite, Zeus Athena, Morpheus, Eros Themis, Poseidon, Hermes
Apollo. Aphrodite. Zeus. Athena. Morpheus. Eros. Themis. Poseidon. Hermes. Apollo. Aphrodite. Zeus. Athena. Morpheus. Eros. Themis. Poseidon. Hermes. Apollo. Aphrodite. Zeus. Athena. Morpheus. Eros. Themis. Poseidon. Hermes. Apollo. Aphrodite. Zeus
Required options
These options will be used automatically if you select this example.
Use a regexp to separate list items. (Advanced.)
Use this field to enter the delimiting symbol or the delimiting regular expression.
Join items in the duplicated list with this symbol.
Append a copy of all list items at the end of the given list.
Number of copies of the list.
Copy the items in reverse order.
Create Multiple Copies of a List
In this example, we create 10 copies of the input list. As we set "\n" to the separator character in the options, the utility assumes that each line of the input is a single list item. In this case, the list has just one item that's a full cubic equation. To duplicate it ten times, we enter "10" in the copies option and also set the output list separator to a new line character. This way, the output list has 10 lines with the same cubic equation on each line.
x³ + x² + x + 1 = 0
x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0 x³ + x² + x + 1 = 0
Required options
These options will be used automatically if you select this example.
Use a character to separate list items. (Default.)
Use this field to enter the delimiting symbol or the delimiting regular expression.
Join items in the duplicated list with this symbol.
Append a copy of all list items at the end of the given list.
Number of copies of the list.
Copy the items in reverse order.
Create a Symmetric List
In this example, we duplicate the items and create a palindromic list of color gradients. We activate the "Reverse Duplication" option, set the number of copies to 2, and get a symmetrical list that goes from red to yellow and back to red. The arrow symbol serves as the input and output separator of items.
Red → Coral → Orange → Gold → Yellow
Red → Coral → Orange → Gold → Yellow → Yellow → Gold → Orange → Coral → Red
Required options
These options will be used automatically if you select this example.
Use a character to separate list items. (Default.)
Use this field to enter the delimiting symbol or the delimiting regular expression.
Join items in the duplicated list with this symbol.
Append a copy of all list items at the end of the given list.
Number of copies of the list.
Copy the items in reverse order.
Create an Interweaved List
In this example, we demonstrate the interweave method for duplicating list items. We take a list of lowercase vowels of the English alphabet and create two interwoven copies. As a result, each letter is copied next to itself and we get two copies of each letter. Also, if you're familiar with functional programming then you'll recognize that interweaving is the same as zipping.
a, e, i, o, u, y
a, a, e, e, i, i, o, o, u, u, y, y
Required options
These options will be used automatically if you select this example.
Use a character to separate list items. (Default.)
Use this field to enter the delimiting symbol or the delimiting regular expression.
Join items in the duplicated list with this symbol.
Copy each item individually and put it next to the same item in the given list.
Number of copies of the list.
Copy the items in reverse order.
Pro tips Master online list tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinelisttools.com/duplicate-list?input=Elegant%20suit....%24600%0ACoat............%24545%0ACasual%20shirt....%2499%0ASummer%20dress....%24270%0AStylish%20skirt...%24540%0AExquisite%20hat...%2480%0AHandbag.........%24400%0AShoes...........%24260&string-separator=true&input-separator=%5Cn&copies=2&join-character=%5Cn&concatenate=true&reverse=false
All list tools
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Quickly print all distinct items of a list.
Quickly print all repeating items of a list.
Quickly count the number of items in a list.
Quickly find certain items in a list.
Quickly print all list items in reverse order.
Quickly sort list items alphabetically or numerically.
Quickly shuffle list items and make it random.
Quickly randomly pick one or more items from a list.
Quickly create a downloadable image from a list.
Quickly display list items in multiple colors.
Quickly set a new delimiter for items in a list.
Quickly remove the symbol that separates list items.
Quickly change list item delimiters to the same symbol.
Quickly remove items from the beginning or end of a list.
Quickly join all items of a list together.
Quickly create groups of multiple list items.
Quickly extract a part of a list.
Quickly remove all empty items from a list.
Quickly remove whitespace characters around list items.
Quickly create multiple copies of a list.
Quickly rotate list items to the left or right (or up and down).
Quickly enumerate list items and add a counter to them.
Quickly add bullet markers to all items in a list.
Quickly wrap all list items in quotes.
Quickly remove all quotation marks from around list items.
Quickly add text on the left and right sides of all list items.
Quickly remove text from the left and right sides of all list items.
Quickly prepend a prefix before each list item.
Quickly delete any prefix from the beginning of all list items.
Quickly append a suffix after each list item.
Quickly delete any suffix from the end of all list items.
Quickly add or remove list items to make it a certain length.
Quickly create multiple columns from a single list.
Quickly create a palindromic list from the given list.
Quickly generate a list of arbitrary length with arbitrary items.
Quickly generate a random length list with random items.
Quickly add new items at the beginning or end of a list.
Quickly left-pad a list with one or more items.
Quickly right-pad a list with one or more items.
Quickly analyze a list and print its item statistics.
Coming soon These list tools are on the way
Edit a List
View and edit lists in a neat browser-based list editor.
Split a List
Split list items into chunks.
Generate the Powerlist
Create the powerlist of the given list.
Find the Car of a List
Extract the first item from a list.
Find the Cdr of a List
Extract all items except the first of a list.
Apply a Function on a List
Run a JavaScript function on every list item.
Delete List Item
Quickly remove certain items from a list.
Find Certain List Items
Quickly find and print items that interest you in a list.
Find Non-repeating List Items
Quickly find and print items that don't repeat in a list.
Find Repeating List Items
Quickly find and print items that repeat in a list.
Delete Repeating List Items
Quickly find and remove items that repeat in a list.
Delete Unique List Items
Quickly find and remove items that are unique in a list.
Extract a Sublist from a List
Given start and stop indexes, extract a sublist from a list.
Shift List Items
Shift list items to the left or right (or up and down).
Indent List Items
Add indentation to all list items.
Mirror a List
Quickly create a mirror copy of a list.
Invert a List
Invert the order of items in a list (last becomes first, etc).
Reduce a List
Run the reduce function on a list.
Convert a List to Rows
Create multiple rows from a single list.
Convert a List to Excel
Create an Excel file from a list.
Convert a List to PDF
Create a PDF file from a list.
Convert a Text List to a LaTeX List
Create a LaTeX list from a regular text list.
Convert a Text List to a HTML List
Create a HTML list from a regular text list.
Convert a Text List to a Markdown List
Create a Markdown list from a regular text list.
Compare Two Lists
Find the difference between two lists.
Compare Three Lists
Find the difference between three lists.
Remove One List from Another
Remove elements from a list that appear in the other list.
Zip Two Lists
Join two lists together item by item.
Merge Two Lists
Append a second list at the end of the first list.
Pair List Items
Create pairs from all list items.
Pop List Items
Remove list items at certain index positions.
Push List Items
Add new items at the end of a list.
Replace List Items
Replace certain items in a list with new items.
Splice a List
Modify a list in-place by adding, replacing, or removing items.
Flatten a List
Remove all indentation levels from a list and make it flat.
Make List Items Title Case
Quickly change the letter case of all items to title case.
Make List Items Proper Case
Quickly change the letter case of all items to proper case.
Make List Items Random Case
Quickly randomly change the letter case of all items.
Make List Items Lowercase
Quickly change the letter case of all items to small letters.
Make List Items Uppercase
Quickly change the letter case of all items to capital letters.
Remove List Item Bullets
Quickly remove any bullet marks before items in a list.
Remove List Item Counter
Quickly remove any numeration from a list of items.
Create the Empty List
Generate a list with no items.
Visualize a List
Quickly create a graphical representation of a list.
Create a List Cloud
Create an image with a cloud of list items.
Let Zalgo Destroy a List
Let Zalgo loose on a list and create list-chaos.