Have you ever needed to combine two CSV files into one but didn't know which method to use? Whether you want to merge customer records, sales reports, employee details, or other datasets, combining CSV files can help you manage your data in one place.
There are several ways to combine two CSV files into one, depending on your requirements. You can use Microsoft Excel, Command Prompt, PowerShell, or a professional CSV Merger tool. In this guide, we will explain these methods step by step so you can choose the one that works best for you.
Why Do You Need to Combine Two CSV Files?
CSV (Comma-Separated Values) files are commonly used to store tabular data. Sometimes, related information is saved in separate files, making it difficult to analyze or manage it together.
Here are some common reasons to combine two CSV files with same columns:
Consolidate data: Merge records from two CSV files into a single file.
Manage large datasets: Keep related information in a single location.
Simplify data analysis: Analyze information from multiple sources together.
Prepare reports by combining monthly sales, customer, or employee records.
Avoid switching between files: Access all relevant data from a single CSV file.
Method 1: Combine Two CSV Files Using Microsoft Excel
Microsoft Excel is a convenient option if you want to combine two CSV files manually. This method works well when both files have a similar structure and contain a manageable amount of data.
Steps to Combine Two CSV Files in Excel
Open the first CSV file in Microsoft Excel.
Open the second CSV file in another Excel window or worksheet.
Select the data rows from the second file that you want to combine.
Copy the selected rows using Ctrl + C.
Switch to the first CSV file.
Navigate to the first empty row below the existing data.
Paste the copied rows using Ctrl + V.
Review the combined data to ensure the columns are aligned correctly.
Click File > Save As and select CSV as the file format.
Save the combined data as a new CSV file.
Limitation: This method requires manual effort, especially when working with multiple files. You must also ensure that both files have matching column structures and avoid copying the header row twice. Excel worksheets have a limit of 1,048,576 rows, so very large datasets may not fit.
Method 2: Combine Two CSV Files Using Command Prompt
Windows Command Prompt provides a simple way to combine CSV files without opening them in Excel. This method is useful when both files have the same column structure.
Steps to Merge CSV Files Using CMD
Place both CSV files in the same folder.
Open the folder containing the files.
Click the address bar, type cmd, and press Enter.
Run the following command to combine both files, including their headers:
Important: This command copies the contents exactly as they appear. If both files contain a header row, the combined file will also contain the second header in the middle of the data.
To retain the first file's header and append only the data rows from the second file, use these commands instead:
These commands assume the second file has a single header line. They are best suited to simple CSV files; files containing unusual encoding or line-ending formats may require additional handling.
Limitation: Command Prompt does not validate column names, remove duplicate records, or check whether the two files have matching structures. You should verify the output before using it.
Method 3: Combine Two CSV Files Using PowerShell
PowerShell offers more control than Command Prompt. You can use it to read CSV data, combine the records, and export the result while retaining a single header row.
Steps to Combine CSV Files Using PowerShell
Place both CSV files in the same folder.
Open PowerShell.
Navigate to the folder containing your CSV files.
Run the following command:
PowerShell uses the first file's column structure when exporting the combined data. Therefore, both files should have compatible column names and structures to avoid missing or misaligned information.
Limitation: This method requires basic PowerShell knowledge. For very large files, importing all records into memory can also affect performance. If the column names differ, you may need to standardize them before combining the files.
Method 4: Combine Two CSV Files Using a Professional Tool
If you frequently combine CSV files or need additional data-management options, a dedicated CSV merger tool can simplify the process. A professional tool can be particularly useful when you need to combine files without manually copying rows or writing scripts.
For example, the SysTools CSV Merger Tool can be used to combine CSV files and handle related CSV management tasks.
Steps to Combine Two CSV Files Using SysTools CSV Merger
Download and install the CSV Merger tool on your computer.
Launch the software and add the two CSV files you want to combine.
Select the appropriate merging option based on your requirements.
Configure the available output settings, if required.
Choose the destination folder for the merged file.
Start the merging process.
Open the output CSV file and verify that the records have been combined correctly.
The exact options may vary by software version, so check the tool's documentation before proceeding.
Advantages of Using a CSV Merger Tool
Reduces manual copy-and-paste work.
Helps streamline repetitive CSV merging tasks.
Can be more convenient when working with multiple files.
Avoids the need to write command-line instructions or scripts.
May offer additional options for managing CSV data, depending on the product.
Conclusion
Combining two CSV files into one is straightforward when both files have a compatible structure. You can use Excel for small datasets, Command Prompt for simple file appending, PowerShell for scripted operations, or Python for more customizable workflows.
If you regularly work with CSV files and want to reduce manual effort, a dedicated CSV merger tool may be a practical alternative. Regardless of the method you choose, always verify the column headers, data alignment, encoding, and duplicate records before relying on the combined file.
