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List prefix adder
World's simplest list tool
This is a super simple browser-based application that prefixes the items in a list. Once you specify the desired prefix in the options, it will be printed in front of each item in your list. You can use lists of any format and customize the input and output delimiters for the items. You can also remove space around items and get rid of empty items. Created by list geeks from team Browserling.
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What is a list prefix adder?
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This online utility prepends a string in front of each list item. For example, if you have a list of phone numbers and you want to add the symbol # before each number, you can do it almost instantly. You don't need to manually add this symbol to each item yourself, instead, all you need to do is enter the # symbol in the prefix option and the utility will add this prefix automatically to all numbers. By default, this program works with comma-separated lists. However, it also supports other list formats, such as pipe-separated lists or semicolon-separated lists. You can use the item delimiter matching option to specify the list format. If the list uses a specific symbol as a delimiter, you can use the symbolic item delimiting mode. If the list uses a combination of symbols as delimiters, you can use the regular expression delimiting mode. Once the item delimiter is defined, you can enter the prefix for each item in the prefix option field. Optionally, you can trim items (remove the empty space around items) and remove items that don't contain anything (just spaces or zero-length data). And one final thing, when the prefixed list is printed in the output, you can also change the delimiter of the output items. Listabulous!
List prefix adder examples
Click to usePrefix a Vertical List
In this example, we add the article "the" at the beginning of all words in a vertical column list. We separate the input items by a newline character, clean up the excess whitespace around them (trim them), and skip the empty newlines. In the output, we also display the new list as a column and each word is now preceded by the definite article.
earth
world
sky
weather
air
month
sun
east
the earth
the world
the sky
the weather
the air
the month
the sun
the east
Required options
Use a character, word, or string
to separate list items.
Enter the separator for the items
in the input list. (A character
or a regular expression).
Enter the prefix to add to items.
Get rid of spaces on the left
and right sides of each item.
Get rid of empty items or
items that don't contain
visible symbols.
Enter a separator for the
output list. (Can be any
character or a longer string).
Add Bullet Points to Items
In this example, we load a list of beautiful birds and add bullets before their names. We delimit the input list via the regex "/[.\n]/" since both periods and newlines are used as separators. We prefix the items with a nice Unicode character "❖" and output the birds' names as a bulleted list.
Hoopoe. Red Crested Turaco
Peafowl. Painted Bunting
Quetzal. Keel-billed Toucan
Atlantic Puffin. Flamingo
Rainbow Lorikeet. Wood Duck
Northern Oriole. Blue Jay
Dusky Lory. Golden Pheasant
Peacock. Bohemian Waxwing
❖ Hoopoe
❖ Red Crested Turaco
❖ Peafowl
❖ Painted Bunting
❖ Quetzal
❖ Keel-billed Toucan
❖ Atlantic Puffin
❖ Flamingo
❖ Rainbow Lorikeet
❖ Wood Duck
❖ Northern Oriole
❖ Blue Jay
❖ Dusky Lory
❖ Golden Pheasant
❖ Peacock
❖ Bohemian Waxwing
Required options
Use a regular expression to
separate list items.
Enter the separator for the items
in the input list. (A character
or a regular expression).
Enter the prefix to add to items.
Get rid of spaces on the left
and right sides of each item.
Get rid of empty items or
items that don't contain
visible symbols.
Enter a separator for the
output list. (Can be any
character or a longer string).
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/add-list-prefix?input=earth%20%0Aworld%0A%20%20sky%0A%0A%20%20weather%20%20%20%0Aair%0Amonth%20%20%0A%0A%20%20sun%0Aeast&string-separator=true&input-separator=%5Cn&join-character=%5Cn&prefix=the%20&trim-items=true&skip-empty=true
All list tools
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 find how many times each item appears in the 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 (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 developers' lives easier, so we created this collection of online list tools. Unlike many other tools, we made our tools free, without ads, and with the simplest possible user interface. Our online list are actually powered by our programming tools that we created over the last couple of years. Check them out!
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the legal stuff
By using Online List Tools you agree to our Terms of Service. TLDR: You don't need an account to use our tools. All tools are free of charge and you can use them as much as you want. You can't do illegal or shady things with our tools. We may block your access to tools, if we find out you're doing something bad. We're not liable for your actions and we offer no warranty. We may revise our terms at any time.