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List length changer

World's simplest list tool

This is a super simple browser-based application that changes the length of a list and adds or removes items to/from it to get the exact number of items in the final list. You can load any list in the input, separate its items by any character (or a regular expression), and set the required number of items in the options. You can specify one or more items to add to the list (if it's too short) and specify the side where these items will be added. You can also remove items from either side to make it shorter. Created by list geeks from team Browserling.
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Split Input List into Items
Use a symbol delimiter if items in the input have a constant symbol between them.
Use a regex separator when multiple characters appear between list items.
Splitting symbol or regular expression.
New List Length
Set the length of the new list.
New item(s) to add to the list. (When its size is increased.)
Add/remove items to/from the right side of the list.
Add/remove items to/from the left side of the list.
Join Items in Output List
Use this symbol to concatenate list items in the output.
Exclude those items from the list that do not contain any visible symbols.
List length changer tool What is a list length changer?
This online utility changes list's size by either adding new items to it (if the size is increased) or removing existing items from it (if the size is decreased). In the options, there's a field where you can set the total number of items that the list should have. For example, if you have a list with 25 items, you can extend it to have 100 items, or if you have a list with 77 items, then you can contract it to have only 50 items. You can also start with an empty list and create a list with exactly 200 items in it (or any other number). Regardless of the length of the initial input list, you'll get a new list with exactly the specified number of items in the output. To make the program correctly identify items in the list and calculate the initial number of items, when you load your list into the input field, you have to indicate what separator is used between its items. It can be a simple character (which is specified in the character delimiter mode) or it can be several changing characters (which are specified in the regular expression mode). If the current item count is greater than the desired list length, then the program will truncate the list to the desired length. If the current number of items is less than the desired length of the list, then the program will pad the list with items specified in the new-items option. You can extend the list with a single item that's duplicated multiple times or enter several items (one per line) and they will be cycled through and repeatedly appended to the list. You can add items to the list both on the left side (beginning of the list) and on the right side (end of the list). Technically speaking, when the items are added at the beginning of the list, this operation is called left padding, and when the items are added at the end of the list, the operation is called right padding. Also, you can remove empty items and specify the connection symbol for the items in the output. Listabulous!
List length changer examples Click to use
Change the Length of a Goods List
In this example, the owner of a furniture store decided to go through the inventory and label all boxes of goods. She created a column list of labels for the first 9 boxes but as the remaining 3 boxes were sealed, she wasn't quite sure what was inside of them. To create a printable list of labels for all 12 boxes, she set the length of the new list to 12 items and filled the blank labels with the text "Unknown product".
Bed Lamp Armchair Cupboard Table Curbstone Dresser Nightstand Chair
Bed Lamp Armchair Cupboard Table Curbstone Dresser Nightstand Chair Unknown product Unknown product Unknown product
Required options
These options will be used automatically if you select this example.
Use a symbol delimiter if items in the input have a constant symbol between them.
Splitting symbol or regular expression.
Set the length of the new list.
New item(s) to add to the list. (When its size is increased.)
Add/remove items to/from the right side of the list.
Use this symbol to concatenate list items in the output.
Exclude those items from the list that do not contain any visible symbols.
Shorten a Christmas Playlist
In this example, we are preparing a playlist for Christmas. As we also have planned to watch a film in the evening, we decided to shorten the playlist to just six songs. To make the list of songs a fixed length, we paste it in the input, split the Christmas songs by a regexp "/[;,]\s*/" (matches commas and semicolons), and set the length of the output list to 6 items. Job done!
White Christmas; The Christmas Song; Frosty the Snowman; Sleigh Ride; Jingle Bells; Merry Christmas, Baby; Feliz Navidad, This Christmas; Christmas Wrapping; Last Christmas; Deck the Halls, Christmas in Hollis; Let It Snow; What's This?, 8 Days of Christmas; Believe; Joy to the World; Silent Night
White Christmas, The Christmas Song, Frosty the Snowman, Sleigh Ride, Jingle Bells, Merry Christmas
Required options
These options will be used automatically if you select this example.
Use a regex separator when multiple characters appear between list items.
Splitting symbol or regular expression.
Set the length of the new list.
New item(s) to add to the list. (When its size is increased.)
Add/remove items to/from the right side of the list.
Use this symbol to concatenate list items in the output.
Exclude those items from the list that do not contain any visible symbols.
Fill a List with Phone Numbers
In this example, we're changing the length of a list of phone numbers. There are only 8 phone numbers in the loaded list but for our purpose, we need it to have 15 items. We separate the input list items with a newline character and set the desired length of the output list to 15 items. To fill the list, we enter three random phone numbers in the new items list and repeatedly add them to the beginning of the list, until the list grows to 15 items.
(808)-780-8093 (292) 991-2438 1-555-760-0385 (761) 619-7513 (619)-862-4369 (763) 424-6568 1-312-556-4860 (500) 345-7914
(111)-111-1111 (222) 222-2222 3-333-333-3333 (111)-111-1111 (222) 222-2222 3-333-333-3333 (111)-111-1111 (808)-780-8093 (292) 991-2438 1-555-760-0385 (761) 619-7513 (619)-862-4369 (763) 424-6568 1-312-556-4860 (500) 345-7914
Required options
These options will be used automatically if you select this example.
Use a symbol delimiter if items in the input have a constant symbol between them.
Splitting symbol or regular expression.
Set the length of the new list.
New item(s) to add to the list. (When its size is increased.)
Add/remove items to/from the left side of the list.
Use this symbol to concatenate list items in the output.
Exclude those items from the list that do not contain any visible symbols.
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/change-list-length?input=Bed%0ALamp%0AArmchair%0ACupboard%0ATable%0ACurbstone%0ADresser%0ANightstand%0AChair&string-separator=true&input-separator=%5Cn&join-character=%5Cn&new-length=12&fill-items=Unknown%20product&change-from-end=true&skip-empty=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.