Combine Multiple CSV Files

Securely merge multiple CSV datasets into a single master document. 100% free, client-side processing with no server uploads.

Click or Drag & Drop CSV files here

Select multiple files (Windows: Ctrl+Click, Mac: Cmd+Click)

Selected Files 0
Automatically removes duplicate column headers from the 2nd file onwards.

How to Merge CSV Files Online?

Combine large datasets for Excel or database imports in 3 simple steps.

1. Select Datasets

Upload or drag-and-drop multiple .csv files into the secure drop zone. Order does not matter.

2. Configure Headers

Leave the header toggle ON to keep the column names from the first file and strip them from the rest.

3. Merge & Export

Click merge to instantly combine files. The final master dataset downloads directly to your device.

Frequently Asked Questions

Is this CSV merger safe for business data?

Absolutely. DataConvert uses 100% client-side JavaScript processing. Your sensitive data is processed entirely within your computer's RAM. We do not upload, store, or view your spreadsheets. It is fully GDPR and CCPA compliant.

Do I need Python, Pandas, or Excel to combine files?

No coding or premium software required! While data scientists often use Python/Pandas or Excel Power Query to concatenate files, our web tool does the exact same job instantly without requiring you to write scripts or buy software.

Does it work on Mac and Windows?

Yes, our free CSV combiner is OS-independent. It works perfectly on Windows, macOS, Linux, and even mobile browsers. It seamlessly handles different line-ending formats (CRLF vs LF) automatically.