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Repeating items deleter

World's simplest list tool

This is a super simple browser-based application that removes repeating items from a list. The program runs through all the items of a list and removes the items that appear in the list more than once. You can load custom lists in the input and set the exact separator used for the items. Additionally, you can remove whitespaces around the items when they are checked for duplicates and remove invisible items. Created by list geeks from team Browserling.
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Adjust Input Separator
Enter in the field below a symbol to separate the items of the original list.
Enter in the field below a regular expression to separate the list items.
Enter the symbol or regex here.
Adjust Spaces in the List
Before finding repeating items, trim all items so that the surrounding space do not affect the result.
Remove items from the list whose length is zero or whose content is just spaces.
Adjust Output Separator
Enter in this field the symbol that the program will place between the output list items.
Repeating items deleter tool What is a repeating items deleter?
This online program removes duplicate items from lists. For example, if you have a playlist of songs and some of the tracks have been entered twice, then instead of manually going through all the songs and searching for duplicated tracks, you can just put your list in this program and get the unique songs in the output. To use this utility, load the list into the input area and update the item separator that it uses. Since lists can have many different formats (they can be comma-delimited, space-delimited, or vertical columns like todo lists), you can specify a character that is used between the list items, which is activated by choosing the character-separation option. For example, if each item is on its own line, then the separator is "\n" (without the quotes). If there are multiple delimiters, you can specify the separator using a regular expression. For example, a list that uses a comma, a semicolon, and a pipe symbol as item delimiters can be matched by the regular expression "/[,;|]/" (without the quotes). Once the items are properly parsed, the program will instantly remove repeating items and print the updated list with non-repeating items in the output field. The updated list can have a completely new separator, which you can change in the options. Also, the program implements several additional functions for better duplicate detection and removal. In particular, it can trim items before looking for duplicates. Trimming means removing any extraneous spaces around the items. And it can remove blank values from the list. Blank values are items that have just space characters in them or that have no characters in them at all. Listabulous!
Repeating items deleter examples Click to use
Islands in the Pacific Ocean
In this example, we upload a file that contains a list of Pacific islands to the input. Unfortunately, the file has many errors – some islands appear twice or three times and there are also a lot of extra spaces around the island names. To fix this, we separate the items with a comma and also turn on the trim-items option. We set the output item separator to a semicolon and get a neat list of all the unique islands in the Pacific ocean. Job done!
New Guinea, New Guinea, Honshu, Sulawesi , Sulawesi, Sulawesi , South Island, North Island, Luzon, Luzon, Luzon, Mindanao , Tasmania, Hokkaido, Hokkaido, Sakhalin , Taiwan Island, Kyushu, Kyushu , Kyushu, New Britain, Vancouver Island, Shikoku, Hainan , Hainan, Hainan, Grande Terre , Palawan, Palawan, Palawan , Hawaii, Viti Levu
New Guinea; Honshu; Sulawesi; South Island; North Island; Luzon; Mindanao; Tasmania; Hokkaido; Sakhalin; Taiwan Island; Kyushu; New Britain; Vancouver Island; Shikoku; Hainan; Grande Terre; Palawan; Hawaii; Viti Levu
Required options
These options will be used automatically if you select this example.
Enter in the field below a symbol to separate the items of the original list.
Enter the symbol or regex here.
Before finding repeating items, trim all items so that the surrounding space do not affect the result.
Remove items from the list whose length is zero or whose content is just spaces.
Enter in this field the symbol that the program will place between the output list items.
A List of Citrus Family Fruits
In this example, we remove the repeating items from a list of citrus fruits. Since the list items are arranged in two columns with space and newline characters serving as separators, we use the separate-by-regexp item finding mode. We enter a regular expression "/\t|\n/" and set a new delimiter equal to em dash "—" in the output.
Orange Clementine Citron Amanatsu Pomelo Grapefruit Kabosu Lime Yukou Yuzu Orange Grapefruit Tangelo Yuzu Lime Mandarin Pomelo Yuzu Citron Chinotto Lemon Oroblanco Lime Yuzu Citron Lime
Orange — Clementine — Citron — Amanatsu — Pomelo — Grapefruit — Kabosu — Lime — Yukou — Yuzu — Tangelo — Mandarin — Chinotto — Lemon — Oroblanco
Required options
These options will be used automatically if you select this example.
Enter in the field below a regular expression to separate the list items.
Enter the symbol or regex here.
Before finding repeating items, trim all items so that the surrounding space do not affect the result.
Remove items from the list whose length is zero or whose content is just spaces.
Enter in this field the symbol that the program will place between the output list items.
Happiness To-do List
In this example, we get rid of the duplicate items in a happiness to-do list. The list uses a vertical arrangement of items with one item per line. We separate them by the newline character "\n", and we also activate the option to remove empty items from the list. All five unique happiness points are also displayed in a vertical column.
❀ dream ❀ dream ❀ dream ❀ love ❀ feel free ❀ relax ❀ relax ❀ be happy ❀ be happy
❀ dream ❀ love ❀ feel free ❀ relax ❀ be happy
Required options
These options will be used automatically if you select this example.
Enter in the field below a symbol to separate the items of the original list.
Enter the symbol or regex here.
Before finding repeating items, trim all items so that the surrounding space do not affect the result.
Remove items from the list whose length is zero or whose content is just spaces.
Enter in this field the symbol that the program will place between the output list items.
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/delete-repeating-list-items?input=%20New%20Guinea%2C%20New%20Guinea%2C%20Honshu%2C%20%20%20Sulawesi%20%20%2C%20Sulawesi%2C%20Sulawesi%20%20%2C%20South%20Island%2C%20North%20Island%2C%20Luzon%2C%20Luzon%2C%20Luzon%2C%20%20%20Mindanao%20%20%2C%20Tasmania%2C%20%20%20%20Hokkaido%2C%20Hokkaido%2C%20%20Sakhalin%20%20%2C%20Taiwan%20Island%2C%20Kyushu%2C%20%20%20Kyushu%20%20%2C%20Kyushu%2C%20New%20Britain%2C%20Vancouver%20Island%2C%20%20%20Shikoku%2C%20%20Hainan%20%20%2C%20Hainan%2C%20Hainan%2C%20Grande%20Terre%20%2C%20Palawan%2C%20Palawan%2C%20Palawan%20%20%2C%20Hawaii%2C%20Viti%20Levu&string-separator=true&input-separator=%2C%20&output-separator=%3B%20&trim-elements=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 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 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.
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.
Base64-encode a List
Convert any list to base64 encoding.
Base64-decode a List
Convert any list from base64 encoding back to a list.
Let Zalgo Destroy a List
Let Zalgo loose on a list and create list-chaos.