List duplicator
World's simplest list toolThis 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.
A link to this tool, including input, options and all chained tools.
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What is a list duplicator?
learn more about this toolThis 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 useDuplicate 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
Use a character to separate
list items. (Default.)
list items. (Default.)
Use this field to enter the
delimiting symbol or the
delimiting regular expression.
delimiting symbol or the
delimiting regular expression.
Join items in the duplicated
list with this symbol.
list with this symbol.
Append a copy of all list items
at the end of the given list.
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
Use a regexp to separate
list items. (Advanced.)
list items. (Advanced.)
Use this field to enter the
delimiting symbol or the
delimiting regular expression.
delimiting symbol or the
delimiting regular expression.
Join items in the duplicated
list with this symbol.
list with this symbol.
Append a copy of all list items
at the end of the given list.
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
Use a character to separate
list items. (Default.)
list items. (Default.)
Use this field to enter the
delimiting symbol or the
delimiting regular expression.
delimiting symbol or the
delimiting regular expression.
Join items in the duplicated
list with this symbol.
list with this symbol.
Append a copy of all list items
at the end of the given list.
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
Use a character to separate
list items. (Default.)
list items. (Default.)
Use this field to enter the
delimiting symbol or the
delimiting regular expression.
delimiting symbol or the
delimiting regular expression.
Join items in the duplicated
list with this symbol.
list with this symbol.
Append a copy of all list items
at the end of the given list.
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
Use a character to separate
list items. (Default.)
list items. (Default.)
Use this field to enter the
delimiting symbol or the
delimiting regular expression.
delimiting symbol or the
delimiting regular expression.
Join items in the duplicated
list with this symbol.
list with this symbol.
Copy each item individually and
put it next to the same item in
the given list.
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://onlinetools.com/list/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=%255Cn&copies=2&join-character=%255Cn&concatenate=true&reverse=false
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Quickly append a suffix after each list item.
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Extract the first item from a list.
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Extract all items except the first of a list.
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Run a JavaScript function on every list item (map function).
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Run the reduce function on a list.
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Quickly find and print items that interest you in a list.
Find Repeating List Items
Quickly find and print 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
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Shift List Items
Shift list items to the left or right (or up and down).
Indent List Items
Add indentation to all list items.
Skew List Items
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Quickly create a mirror copy of a list.
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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
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Find the difference between three lists.
Remove One List from Another
Remove elements from a list that appear in the other list.
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Find items that are shared between two or more lists.
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Add new items at the end of a list.
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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 Bold
Quickly apply the bold effect to all list items.
Make List Items Italic
Quickly apply the italic effect to all list items.
Make List Items Cursive
Quickly rewrite all list items in cursive.
Change List Item Font
Quickly change the font of all list items.
Add an Underscore to List Items
Quickly add an underscore to all list items.
Add a Strikethrough to List Items
Quickly add a strikethrough to all list items.
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 Counter
Quickly remove any numeration from a list of items.
Create an Empty List
Generate a list with no items (just bullet points).
Visualize a List
Quickly create a graphical representation of a list.
Create a List Cloud
Create an image with a cloud of list items.
Create a Spiral List
Create an image with list items going in a spiral.
Create a ZigZag List
Make list items go in a zigzag.
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is duplicated two times, you
will get "a, b, c, a, b, c".