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Repeating List 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.

Repeating List 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.

᠎᠎᠎          Tool Options

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 Repeating Items

Remove absolutely all items
that occur more than once.
(Leave unique items only.)
Don't remove repeated items
that use a different letter case.
For example, the items "Lime"
and "lime" will be two
different items.

Adjust Separator and Spaces

Enter in this field the symbol
that the program will place
between the output list items.
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.

What Is a Repeating List 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. And it can compare list items based on their letter case. By activating the "Case Sensitive Items" checkbox, items such as "Bill", "bill", and "BILL" will be considered as different items and will not be deleted. If this checkbox is turned off, then all three words will be considered duplicates. Additionally, if you want to remove absolutely all items that have duplicates, then you can activate the "Delete All Repeating Items" option. When this option is on, you'll get a list of totally unique items that appear in the list once. Listabulous!

What Is a Repeating List 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. And it can compare list items based on their letter case. By activating the "Case Sensitive Items" checkbox, items such as "Bill", "bill", and "BILL" will be considered as different items and will not be deleted. If this checkbox is turned off, then all three words will be considered duplicates. Additionally, if you want to remove absolutely all items that have duplicates, then you can activate the "Delete All Repeating Items" option. When this option is on, you'll get a list of totally unique items that appear in the list once. Listabulous!


Repeating List Items Deleter Examples

Click to try!
click me

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.
Remove absolutely all items
that occur more than once.
(Leave unique items only.)
Don't remove repeated items
that use a different letter case.
For example, the items "Lime"
and "lime" will be two
different items.
Enter in this field the symbol
that the program will place
between the output list items.
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.
click me

Hide a PIN in a List of Digits

In this example, we came up with our own method of hiding a PIN code from unwanted eyes. We hid our secret four-digit PIN in a list of many repeated digits. To find the code, we just need to get rid of all the duplicate digits. We use the "Delete All Repeating Items" option for this and get a dash-separated pin code in the output.

6 4 8 5 2 9 1 7 3 4 5 1 7 2 0 6
0-3-8-9
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.
Remove absolutely all items
that occur more than once.
(Leave unique items only.)
Don't remove repeated items
that use a different letter case.
For example, the items "Lime"
and "lime" will be two
different items.
Enter in this field the symbol
that the program will place
between the output list items.
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.
click me

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.
Remove absolutely all items
that occur more than once.
(Leave unique items only.)
Don't remove repeated items
that use a different letter case.
For example, the items "Lime"
and "lime" will be two
different items.
Enter in this field the symbol
that the program will place
between the output list items.
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.
click me

Items with Different Case

In this example, we activate the "Case Sensitive Items" option so that all fruit items that have variations in their letter case were treated as completely different items. In particular, such items are "apple" and "APPLE", "banana" and "BANANA", "orange" and "ORANGE", and "cherry" and "CHERRY".

apple apple APPLE banana banana BANANA orange orange ORANGE cherry cherry CHERRY
apple APPLE banana BANANA orange ORANGE cherry CHERRY
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.
Remove absolutely all items
that occur more than once.
(Leave unique items only.)
Don't remove repeated items
that use a different letter case.
For example, the items "Lime"
and "lime" will be two
different items.
Enter in this field the symbol
that the program will place
between the output list items.
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.
click me

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.
Remove absolutely all items
that occur more than once.
(Leave unique items only.)
Don't remove repeated items
that use a different letter case.
For example, the items "Lime"
and "lime" will be two
different items.
Enter in this field the symbol
that the program will place
between the output list items.
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.

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/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=%252C%20&output-separator=%253B%20&trim-elements=true&skip-empty=false&case-sensitive=false&totally-unique=false

All List Tools

Didn't find the tool you were looking for? Let us know what tool we are missing and we'll build it!
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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Created with love by

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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