How to Split CSV into Multiple Files Mac with Header?

admin | Cloud Communications CSV Split how to News Products | 5 minutes read | Last updated on July 13th, 2023,

Are you having large-size CSV files that you want to split into multiple files for proper data management? Wondering how to split CSV into multiple files Mac with header? Searching for an effective technique to perfectly and smoothly split CSV into multiple files on Mac? If yes, then not to take worries anymore because in the following section, MacMister has discussed a solution that will help users to split large CSV into multiple files with ease.

Managing datasets of large size is an important part of data analysis as well as processing. However, utilizing large CSV files can be overwhelming sometimes or one can say very challenging, especially during the import and data manipulation.

However, one common solution to handle them is by splitting large CSV file into multiple files that are easily manageable, especially helpful when having limited storage space or a need to share the data with others.

How to Split CSV into Multiple Mac with Header?

The blog here will provide multiple strategies of how to split CSV file into smaller files on Mac computer. You can use the suitable method and split CSV into multiple files on Mac as per your necessities.

  • Method 1. Using Mac Terminal
  • Method 2. Using MacMister CSV Splitter
  • Method 3. Using SplitCSV

Method 1. Split CSV using Mac Terminal

Mac Terminal method is an effective way to achieve the required task:

Split CSV File using Terminal

Step-by-Step Process to split CSV with the help of Mac Terminal method:

In order to split a CSV file using the Mac Terminal, you can use Split command. The split command allows to split a file into smaller pieces based on the number of lines or the file size.

Assuming you have a file named largefile.csv that you need to split into smaller files containing 1000 lines each, then you can use the following command:

split -1 1000 largefile.csv

This will create multiple files named ‘xaa’, ‘xab’, ‘xac’, etc. each will contain 1000 lines from the original file.

If you want to specify a different prefix for the output files, you can use the ‘-d’ option followed by the prefix:

split -1 1000 largefile.csv output_

This will create output files named ‘output_00’, ‘output_01’, ‘output_02’, etc.

If you want to split PST file based on the file size in spite of the number of lines, you can use ‘-b’ option followed by the size.

split -b 10m largefile.csv

This will split the file into small chunks of 10MB each.

Note. The ‘split’ command splits the file into smaller pieces but does not modify the original file. If you want to split the file into smaller pieces and delete the original file, you can use ‘rm’ command.

split -1 1000 largefile.csv && rm largefile.csv

This will help in splitting the file into smaller pieces and delete the original file.

However, you can merge those files as well with the help of the terminal. Follow the next section to implement the same.

Merge CSV using Mac Terminal

After splitting CSV file, you can merge them back by using Mac Terminal. Follow the steps to merge multiple CSV files into large CSV.

  1. Open Mac Terminal
  2. Go to Directory containing the smaller files
  3. Merge smaller files

In order to merge the smaller CSV files into one large CSV, you need to use cat command followed by the names of the files you want to merge.

Assuming you have two files named file1.csv and file2.csv and you want to merge them into a new file named merged.csv, you can use the following command:

cat file1.csv file2.csv > merged.csv

The > symbol redirects the output to a new file called merged.csv. You can add the contents of the two files to an existing file called existing.csv, use the following command:

cat file1.csv file2.csv >> existing.csv

The >> symbol appends the contents of two files to the end of the existing files.

Note. If CSV files have headers, the merged file will contain multiple headers. You may need to remove the extra headers manually.

Method 2. Split Large CSV using MacMister CSV Splitter

With the help of MacMister CSV Splitter for Mac application, users can split large CSV into multiple files Mac with header. The software is easy, efficient, and reliable. Both technical and novice user can operate the application effortlessly and perform the required task without any difficulty. Even, the GUI and steps are simple to operate. They will quickly break large CSV files and delivers desired result to users in minimum time.

Moreover, the application provides several list of features with the help of which users can implement the splitting procedure according to their requirements. However, one can use the trial edition of the tool and test the procedure for free.

Working Steps to Split CSV into Multiple Files Mac with Header

Step 1. Open MacMister CSV Splitter on any Mac OS device.

Step 2. Use Add File(s)/Add Folder buttons to add large CSV files on the tool.

Step 3. The tool will scan CSV files and list them on the software with checkboxes.

Step 4. Go to the Browse button to add the required destination path to save the resultant files.

Step 5. Set the sub-options according to your necessities i.e. include column headers in each CSV split file. Simultaneously, you can use no. of rows per split file and CSV file encoding. When done, press the Split button.

Step 6. The splitting process will start and the tool will show the live process that will display the current split progress to users.

In a few seconds, the entire task will end and then users will get Conversion Completed pop-up to users. Click OK and go to the destination path to check the resultant files. However, you will see that the data in CSV files is original and appears with 100% accuracy.

Method 3. Break CSV File using SplitCSV

SplitCSV is web-based that allow users to divide large CSV files into smaller manageable CSV pages.

However, to use the option, go to its website and upload the necessary CSV file on the same. The tool itself will guide you through the entire splitting process and will allow you to choose the splitting options for desired implementation. With the help of the same, users can split by the number of rows, split by file size, and preset splitting options.


The blog has discussed the approach to split CSV into multiple files Mac with header. The methods explained here are implementable. However, it will be better if you take the help of technical experts to perform the process with the help of Method 1. Because it is quite technical and needs to be done smoothly. Whereas, Method 2 and Method 3 are simple and can be used by anyone.

Quick Note. Method 2 i.e. MacMister CSV Split Tool offers a trial edition that will help in analyzing and evaluating the tool for free. For any assistance, contact MacMister Support.