Merge CSV Files Into One Large File on Windows 10: A Step-by-Step Guide


Michael Collins

Merging CSV files into one large file in Windows 10 is a simple process that can be done using the built-in Command Prompt tool. This task is useful when you have multiple CSV files with similar data that you want to combine for analysis or reporting. In just a few steps, you’ll have a single, consolidated CSV file ready to use.

Step by Step Tutorial to Merge CSV Files Into One Large CSV File in Windows 10

Before we dive into the steps, let’s understand that merging CSV files means combining the contents of several CSV files into one. This is particularly useful when dealing with data from different sources that you want to analyze collectively.

Step 1: Open Command Prompt

Open Command Prompt by typing "cmd" in the Windows search bar and hitting Enter.

The Command Prompt is a command-line interpreter that lets you perform various tasks by typing commands. It’s a powerful tool that can save you a lot of time if you know the right commands to use.

Step 2: Navigate to the Folder Containing the CSV Files

Use the cd command followed by the path to the folder containing your CSV files to navigate to that folder.

Remember to replace the placeholder path with the actual path where your CSV files are stored. For example, if your files are in a folder named "Data" on your Desktop, you would type cd DesktopData.

Step 3: Merge the CSV Files

Type the command copy *.csv combined.csv and press Enter to merge all CSV files in the folder into one file named "combined.csv."

The *.csv part of the command tells the computer to include all files that end with ".csv" in the current folder. "Combined.csv" will be the name of your new, merged file.

After completing the action, you will have a single CSV file that contains all the data from the original files. This file can be opened in any spreadsheet program like Microsoft Excel or Google Sheets for further analysis or processing.

Tips for Merging CSV Files Into One Large CSV File in Windows 10

  • Make sure all the CSV files you want to merge are in the same folder to simplify the process.
  • Ensure that the CSV files have the same structure, with the same columns in the same order, for a seamless merge.
  • The merged file will have repeated headers if the original files had headers. You may need to remove the duplicates manually.
  • Consider backing up your original CSV files before merging them, just in case something goes wrong.
  • If you have a large number of files to merge, the process might take a while. Be patient and wait for the command to complete.

Frequently Asked Questions

What is a CSV file?

A CSV file is a text file that uses a specific format to store tabular data. CSV stands for "Comma-Separated Values," which describes how the data is separated in the file.

Can I merge CSV files that have different columns?

It’s possible, but the resulting file may have mismatched or empty data in some cells. It’s best to merge files that have the same columns.

Will the merged file include headers from each original file?

Yes, if the original files had headers, those will be included in the merged file. You’ll need to remove the duplicates manually.

Can I merge CSV files with different encodings?

Merging files with different encodings can lead to garbled data. It’s recommended to convert all files to the same encoding before merging.

Is there a limit to how many files I can merge at once?

There’s no hard limit, but the performance may degrade if you’re merging a very large number of files. You might want to merge them in smaller batches.


  1. Open Command Prompt
  2. Navigate to the folder containing the CSV files
  3. Merge the CSV files into one


Merging CSV files into one large CSV file in Windows 10 is a straightforward process that can be done quickly using the Command Prompt. By following the steps outlined in this article, you can easily combine multiple CSV files, making data management and analysis more efficient. Remember, it’s always a good idea to back up your files before performing any sort of data manipulation. And don’t forget to remove any duplicate headers that might result from the merge.

Whether you’re a data analyst, a marketer, or just someone who loves organizing data, mastering this simple yet powerful technique can save you time and hassle. So next time you find yourself drowning in a sea of CSV files, take a deep breath and remember: a few commands are all it takes to bring order to chaos. Happy merging!