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List left-padder

World's simplest list tool

This is a super simple browser-based application that left-pads a list. You can load any list in the input and adapt to its format by setting the item separator character that it uses. Once items in the list are recognized, it will left-pad the list to the required length with the given new items. You can set the list padding length in the options, as well as specify the items that are used for padding in the options. Created by list geeks from team Browserling.
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Separator Between Input Items
If the delimiter is one symbol, separate items by that character.
If the delimiter is multiple symbols, separate items by regular expression.
Set the separator symbol or the regular expression that matches all separators.
Padding Length and New Items
The length of the padded list.
Use these items for padding the list.
Separator Between Output Items
Specify a character to use as a separator for the items of the output list.
Prune elements of zero length from the list.
List left-padder tool What is a list left-padder?
This online tool pads a list by adding new items on the left side (beginning) of the list. First, it counts how many items there are in your existing list. Then it calculates how many new items does it have to add to the beginning of the list to achieve the specified new length of the list. You can pad the list with just one new item or multiple items that are cyclically repeated. If you want to, you can also pad the list with just a single character or symbol. If your list is shorter than the required new length, then the list will be returned as it was and won't be padded or modified. To add several different items to the list, enter them separated by newlines in the options. The program works with all types of lists, be it vertical todo lists, lists that use commas as item delimiters, or lists that use pipes as delimiters. The program can adapt to your list via two different item delimiter matcher modes. When your list uses a simple delimiter, use the symbol delimiter matching mode, but if your list uses a changing delimiter, use the regular expression delimiter matching mode. The new padded list in the output can also use a completely new item delimiter. Additionally, if your list contains empty items, you can prune them from the output. Listabulous!
List left-padder examples Click to use
Left-pad a List of Hats
In this example, we left-pad a list of hats. We load a vertical list in the input and separate the items via the newline character. The input list has 13 hats in it but we want to change the length to be 18 hats. We enter two new hats "Beret" and "Cowboy Hat", create 2.5 new copies out of them, and append them to the beginning of the hat list.
Baseball Cap Fedora Newsboy Hat Cocktail Hat Deerstalker Panama Hat Trapper Hat Bowler Hat Fascinator Hat Cloche Hat Boater Pillbox Hat Bucket Hat
Beret Cowboy Hat Beret Cowboy Hat Beret Baseball Cap Fedora Newsboy Hat Cocktail Hat Deerstalker Panama Hat Trapper Hat Bowler Hat Fascinator Hat Cloche Hat Boater Pillbox Hat Bucket Hat
Required options
These options will be used automatically if you select this example.
If the delimiter is one symbol, separate items by that character.
Set the separator symbol or the regular expression that matches all separators.
The length of the padded list.
Use these items for padding the list.
Specify a character to use as a separator for the items of the output list.
Add Games to the List
In this example, we're creating a list of games to buy for the party. We need 25 games in total but the current list only has 20 games. We're the hugest Twister fans so we left-padded the list with 5 Twister games. To do it, we split the original items by a regex "/[,.]\s*/", then we specify "Twister" in the options, and the program left-pads the list from the beginning with Twister repeated five times.
Clue, Monopoly, Scrabble. Battleship, Risk, Stratego. Axis & Allies, Chess. Backgammon, Checkers, Blokus. Agricola, Boggle, Mastermind. Qwirkle, Cranium, Dominoes. Carcassonne, Sorry!, Trouble
Twister * Twister * Twister * Twister * Twister * Clue * Monopoly * Scrabble * Battleship * Risk * Stratego * Axis & Allies * Chess * Backgammon * Checkers * Blokus * Agricola * Boggle * Mastermind * Qwirkle * Cranium * Dominoes * Carcassonne * Sorry! * Trouble
Required options
These options will be used automatically if you select this example.
If the delimiter is multiple symbols, separate items by regular expression.
Set the separator symbol or the regular expression that matches all separators.
The length of the padded list.
Use these items for padding the list.
Specify a character to use as a separator for the items of the output list.
Activities To-do List
In this example, we left-pad our activities to-do list for the holidays. We split the items by the newline character and expand the list to 19 items by complementing it with three fun new ideas: riding a bike, baking cookies, and going to the pool. Additionally, we remove the empty items from the input list so that the output was clean and instantly usable.
- Go rollerskating - Have a picnic - Go bowling - Visit the library - Go to a museum - Fly a kite - Go to the park - Go to the beach - Go fishing - Play frisbee - Play baseball - Plant a garden - Wash the car - Draw a picture
- Ride a bike - Bake cookies - Go to the pool - Ride a bike - Bake cookies - Go rollerskating - Have a picnic - Go bowling - Visit the library - Go to a museum - Fly a kite - Go to the park - Go to the beach - Go fishing - Play frisbee - Play baseball - Plant a garden - Wash the car - Draw a picture
Required options
These options will be used automatically if you select this example.
If the delimiter is one symbol, separate items by that character.
Set the separator symbol or the regular expression that matches all separators.
The length of the padded list.
Use these items for padding the list.
Specify a character to use as a separator for the items of the output list.
Prune elements of zero length from the list.
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/left-pad-list?input=Baseball%20Cap%0AFedora%0ANewsboy%20Hat%0ACocktail%20Hat%0ADeerstalker%0APanama%20Hat%0ATrapper%20Hat%0ABowler%20Hat%0AFascinator%20Hat%0ACloche%20Hat%0ABoater%0APillbox%20Hat%0ABucket%20Hat&string-separator=true&input-separator=%5Cn&join-character=%5Cn&new-length=18&fill-items=Beret%0ACowboy%20Hat
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 display list items in multiple colors.
Quickly generate a list of arbitrary length with arbitrary items.
Quickly generate a random length list with random items.
Quickly find certain items in a list.
Quickly replace certain items in a list with new items.
Quickly remove items from a list that match a pattern.
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 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 remove all bullet markers from list items.
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 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 remove items that repeat in a list.
Quickly apply a filter on all list items (extract certain 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.
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.
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 (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 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 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.
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.
Let Zalgo Destroy a List
Let Zalgo loose on a list and create list-chaos.