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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.

What is a list duplicator?

learn more about this tool
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://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
All list tools
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Find Unique List Items
Quickly print all distinct items of a list.
Find Duplicate List Items
Quickly print all repeating items of a list.
Find the Length of a List
Quickly count the number of items in a list.
Color List Items
Quickly display list items in multiple colors.
Create a Custom List
Quickly generate a list of arbitrary length with arbitrary items.
Create a Random List
Quickly generate a random length list with random items.
Find List Items
Quickly find certain items in a list.
Find Most Popular List Items
Quickly find how many times each item appears in the list.
Replace List Items
Quickly replace certain items in a list with new items.
Delete List Items
Quickly remove items from a list that match a pattern.
Reverse a List
Quickly print all list items in reverse order.
Sort a List
Quickly sort list items alphabetically or numerically.
Randomize a List
Quickly shuffle list items and make it random.
Randomly Select a List Item
Quickly randomly pick one or more items from a list.
Convert a List to an Image
Quickly create a downloadable image from a list.
Change List Item Separator
Quickly set a new delimiter for items in a list.
Delete List Item Separators
Quickly remove the symbol that separates list items.
Normalize List Item Separators
Quickly change list item delimiters to the same symbol.
Truncate a List
Quickly remove items from the beginning or end of a list.
Join List Items
Quickly join all items of a list together.
Group List Items
Quickly create groups of multiple list items.
Slice a List
Quickly extract a part of a list.
Delete Empty List Items
Quickly remove all empty items from a list.
Trim List Items
Quickly remove whitespace characters around list items.
Duplicate a List
Quickly create multiple copies of a list.
Rotate a List
Quickly rotate list items to the left or right (or up and down).
Add a List Item Counter
Quickly enumerate list items and add a counter to them.
Add List Item Bullets
Quickly add bullet markers to all items in a list.
Remove List Item Bullets
Quickly remove all bullet markers from list items.
Quote List Items
Quickly wrap all list items in quotes.
Unquote List Items
Quickly remove all quotation marks from around list items.
Wrap Text Around Items
Quickly add text on the left and right sides of all list items.
Unwrap Items From Text
Quickly remove text from the left and right sides of all list items.
Add a List Item Prefix
Quickly prepend a prefix before each list item.
Remove a List Item Prefix
Quickly delete any prefix from the beginning of all list items.
Add a List Item Suffix
Quickly append a suffix after each list item.
Remove a List Item Suffix
Quickly delete any suffix from the end of all list items.
Change the Length of a List
Quickly add or remove list items to make it a certain length.
Convert a List to Columns
Quickly create multiple columns from a single list.
Create a Symmetric List
Quickly create a palindromic list from the given list.
Append Items to a List
Quickly add new items at the beginning or end of a list.
Left-pad a List
Quickly left-pad a list with one or more items.
Right-pad a List
Quickly right-pad a list with one or more items.
Delete Repeating List Items
Quickly remove items that repeat in a list.
Filter a List
Quickly apply a filter on all list items (extract certain items).
Print List Statistics
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 (map function).
Reduce a List
Run the reduce function on a list.
Find Certain List Items
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
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.
Skew List Items
Make a list go increasingly sideways (to the left or right).
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).
Convert a List to Rows
Create multiple rows from a single list.
Convert a List to Excel
Create an Excel (XLS/XLSX) 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.
Find Common Items in Lists
Find items that are shared between two or more lists.
Find Distinct Items in Lists
Find items that are unique in two or more lists.
Zip Two Lists
Join two or more lists together item by item.
Unzip Two Lists
Split an interleaved list into two or more separate lists.
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.
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 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.
Add Errors to a List
Add errors and corruption to a list.
Base64-encode a List
Convert any list to base64 encoding.
Base64-decode a List
Convert any list from base64 encoding back to a list.
URL-encode a List
Convert any list to URL encoding.
URL-decode a List
Convert any list from URL encoding back to a list.
Convert a List to JSON
Create a JSON array from a list.
Convert JSON to a List
Create a list from a JSON array.
Convert a List to XML
Create an XML document from a list.
Convert XML to a List
Create a list from an XML document.
Convert a List to YAML
Create a YAML file from a list.
Convert YAML to a List
Create a list from a YAML file.
Convert a Text List to a Binary List
Create a binary list from a text list.
Convert a Binary List to a Text List
Create a text list from a binary list.
Compress a List
Compress a list so it uses less space.
Scroll a List
Create an animation with a list being scrolled.
Let Zalgo Destroy a List
Let Zalgo loose on a list and create list-chaos.
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We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling our mission is to make people's lives easier, so we created this collection of online list tools. Our tools are focused on getting things done quickly and as soon as you load your list in the input of any of our tools, you'll instantly get the result. Our list tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!
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