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CSV Column Inserter

world's simplest csv tool

Free online CSV column inserter. Just upload your CSV file in the form below, paste the new column in the options, and it will automatically get inserted in your CSV. In the tool options, you can also specify more than one column to insert, set the insertion position, and optionally skip the empty and comment lines. Created by programmers from team Browserling.

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᠎᠎᠎          Tool Options

New Column to Insert

Enter one or more columns you
want to insert into the CSV.
For example:

animal,fur,legs
horse,yes,4
dolphin,no,0
spider,no,8
human,no,2

New Column Position

Specify the column number
after which to insert the new
one (starting from 0).
Specify the column name after
which to insert the new one.
If the specified column name
appears more than once in
CSV, then add the new column
after each such column.

Incomplete Values

Choose what to do if a column
or row is not completely
filled with values.
If you used "Set Custom Values",
then enter a custom value here
to fill in all empty CSV fields.

CSV Cleaning

Specify the symbol that starts
the comment line.
Don't output empty lines.

What Is a CSV Column Inserter?

This tool inserts one more new column into an existing CSV file at a specified position. It takes a comma-separated values (CSV) file as input and adds a new column (or multiple columns) with new values to the file. The new columns should have a vertical structure and consist of the same number of rows vertically as the input CSV. For example, if the input CSV has a header row and 200 data rows (total of 201 rows), then the new column should also have a header row and 200 data rows (also total of 201 rows). To add multiple columns at once, you can specify several CSV fields in a row as comma-separated data. The position where to insert the new column in the CSV file can be specified in two ways. The first method is to indicate the number of the input column after which to place the new column. For example, if the number is set to 0, the new column will become the first column in the output CSV. If the number is set to 1, the new column will be placed immediately after the first column and it will become the second column in the output CSV. The other method of specifying the position is to select the input column by name (header) and place the new column immediately after it. For example, entering the name "age" will insert the new column in the output immediately after the column whose header is "age". If there are multiple identical headers in the input CSV file, you can activate the "Match All Column Names" option. This option will add the new column after each of the input columns that matches the specified name. If there is any discrepancy in the height of columns or the number of values in the records, you can choose how to handle the incomplete data. The first option, called "Leave CSV Incomplete" will ignore incomplete data and display the CSV as it is. The second option, called "Discard Incomplete values" will remove lines from the file where incomplete data is present (missing values in records). The third option, called "Set Empty Values" will insert an empty element in each such place (an empty element in a CSV file is just two adjacent commas, like this: ",,"). The fourth option, called "Set Custom Values" allows you to specify a custom value, such as "x", and this value will be added in place of all missing CSV values in the output. Additionally, you can manage comments and empty lines in the CSV. You can choose to remove comments or keep them unchanged by specifying the symbol that indicates a comment line in the options. You can also choose to remove or keep all empty lines in the CSV. Csv-abulous!

CSV Column Inserter Examples

Click to try!

Add One Column to a CSV File

In this example, we insert a column with the title "city" into a CSV file that already contains two other columns with titles "name" and "age". The new column consists of three values: "city", "dallas", and "houston", corresponding to the height of the input CSV data. The value "city" is the header value (appearing on the first row) and values "dallas" and "houston" are data values (appearing on rows two and three). We specify the position of the new column by an ordinal number and set it to 1 in the options. This value indicates that the new "city" column should be placed after the first column.

name,age john,25 emma,22
name,city,age john,dallas,25 emma,houston,22
Required options
These options will be used automatically if you select this example.
Enter one or more columns you
want to insert into the CSV.
Specify the column number
after which to insert the new
one (starting from 0).
Specify the column name after
which to insert the new one.
If the specified column name
appears more than once in
CSV, then add the new column
after each such column.
Choose what to do if a column
or row is not completely
filled with values.
If you used "Set Custom Values",
then enter a custom value here
to fill in all empty CSV fields.
Specify the symbol that starts
the comment line.
Don't output empty lines.

Insert a Column By a Column's Name

In this example, we supplement our CSV containing the sports event schedule with an additional "time" column. We select the column name insertion mode and enter "day" as the name of the existing column after which to insert the new column. We also activate the option to repeatedly insert the new column after each found column instance with the same name. As a result, our new column gets added to the two twice. The first time, the new column is inserted after the "day" column in the 3rd position, and the second time, the new column is inserted after the "day" column in the 5th position. As a result, we get a new CSV that contains the exact time of our preferred sports events and contains a more precise schedule.

sport,day,day Boxing,Mon,Thu Rugby,Tue,Fri Tennis,Wed,Sat
sport,day,time,day,time Boxing,Mon,7am,Thu,7am Rugby,Tue,1pm,Fri,1pm Tennis,Wed,10am,Sat,10am
Required options
These options will be used automatically if you select this example.
Enter one or more columns you
want to insert into the CSV.
Specify the column number
after which to insert the new
one (starting from 0).
Specify the column name after
which to insert the new one.
If the specified column name
appears more than once in
CSV, then add the new column
after each such column.
Choose what to do if a column
or row is not completely
filled with values.
If you used "Set Custom Values",
then enter a custom value here
to fill in all empty CSV fields.
Specify the symbol that starts
the comment line.
Don't output empty lines.

Insert Multiple Columns into a CSV

In this example, we append two data columns to the end of CSV data. The input CSV has data about cars, including the "Brand" and "Model" of the car. We now add two more columns at the end: "Year" and "Price". To do this, we enter these two data columns in the comma-separated format in the "New Column" option, and to quickly add the new columns to the end of the CSV, we specify their position as "-1", which means count positions from the end (in this case it's the first position from the end, which is equal to the very end).

Brand,Model Toyota,Camry Ford,Mustang Honda,Accord Chevrolet,Malibu
Brand,Model,Year,Price Toyota,Camry,2022,25000 Ford,Mustang,2021,35000 Honda,Accord,2022,27000 Chevrolet,Malibu,2021,28000
Required options
These options will be used automatically if you select this example.
Enter one or more columns you
want to insert into the CSV.
Specify the column number
after which to insert the new
one (starting from 0).
Specify the column name after
which to insert the new one.
If the specified column name
appears more than once in
CSV, then add the new column
after each such column.
Choose what to do if a column
or row is not completely
filled with values.
If you used "Set Custom Values",
then enter a custom value here
to fill in all empty CSV fields.
Specify the symbol that starts
the comment line.
Don't output empty lines.

Add Incomplete Price Data to CSV

In this example, not only do we add a column with prices to an existing CSV of store orders but also clean up the data and fill in the missing price fields. We input the "price" column as the new column to add in the options and place it after the "category" column. As the new column lacks prices for several of the records, we enable the option to fill in the incomplete data with a custom value "[?]". This symbol maintains the square matrix structure of the CSV file and makes it easier for employees to spot that several products are missing the price data. Additionally, we remove comments from the CSV that start with the "#" symbol and delete empty lines.

order_id,product_id,category,quantity 1001,P123,Clothing,1 1002,B456,Electronics,2 1004,T1011,Toys,3 #fulfill asap 1005,F1314,Food,2
order_id,product_id,category,price,quantity 1001,P123,Clothing,25.99$,1 1002,B456,Electronics,199.99$,2 1004,T1011,Toys,[?],3 1005,F1314,Food,[?],2
Required options
These options will be used automatically if you select this example.
Enter one or more columns you
want to insert into the CSV.
Specify the column number
after which to insert the new
one (starting from 0).
Specify the column name after
which to insert the new one.
If the specified column name
appears more than once in
CSV, then add the new column
after each such column.
Choose what to do if a column
or row is not completely
filled with values.
If you used "Set Custom Values",
then enter a custom value here
to fill in all empty CSV fields.
Specify the symbol that starts
the comment line.
Don't output empty lines.

Add an Empty CSV Column

In this example, we insert an empty column into an existing CSV file containing dogs and their owners. To do this, we leave the new column data in the option empty, which makes the program generate a column of empty fields at the specified position. This trick allows you to create and reserve empty fields for future CSV data filling.

dog_name,breed,owner_name Bella,Bulldog,John Luna,Beagle,Sarah Buddy,Poodle,Michael
dog_name,breed,,owner_name Bella,Bulldog,,John Luna,Beagle,,Sarah Buddy,Poodle,,Michael
Required options
These options will be used automatically if you select this example.
Enter one or more columns you
want to insert into the CSV.
Specify the column number
after which to insert the new
one (starting from 0).
Specify the column name after
which to insert the new one.
If the specified column name
appears more than once in
CSV, then add the new column
after each such column.
Choose what to do if a column
or row is not completely
filled with values.
If you used "Set Custom Values",
then enter a custom value here
to fill in all empty CSV fields.
Specify the symbol that starts
the comment line.
Don't output empty lines.

Pro tips Master online csv 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/csv/insert-csv-columns?input=name%2Cage%0Ajohn%2C25%0Aemma%2C22&insert-column=city%250Adallas%250Ahouston&use-column-number=true&column-number=1&use-column-name=false&column-name=name&insert-select-all=false&incomplete-format=leave-incomplete&custom-value=x&remove-comments=false&comment-character=%2523&remove-empty-lines=false

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