Merge CSV Files Online
Combine multiple CSV files into a single spreadsheet in seconds.
Files to Merge
All files must share the same column structure for a clean merge.
Drop CSV files here or click to browse
Add 2 or more files — processed entirely in your browser
Merged Output
Merged CSV will appear here
Merge CSV Files – Fast & Free
Got sales exports, survey data, or campaign reports split across several files? Our CSV merger stacks rows from multiple .csv files into one clean output — perfect for consolidating monthly exports into a yearly dataset.
Columns are matched intelligently: shared columns align automatically and new columns are added without losing a single row. Everything runs in your browser, so your data never leaves your device.
How to Merge CSV Files
Our tool makes it incredibly easy to work with your data files.
Upload CSVs
Drag and drop two or more .csv files, or click to browse and add them one by one.
Click Merge
Press "Merge CSVs". Columns are unified and every row from every file is combined.
Download Result
Preview the merged table, then download the combined .csv or copy it.
Why Use Our CSV Merger?
Unlimited Files
Merge 2, 5, or 20 files — no file limits, completely free.
Instant Results
Local processing means large merges finish in seconds.
100% Private
Files never leave your device — zero uploads, zero storage.
Smart Column Matching
Shared columns align automatically; new columns are appended.
Excel Ready
Output opens perfectly in Excel, Google Sheets, and Airtable.
No Data Loss
Every row is preserved — even when files have different columns.
Frequently Asked Questions
Common questions about this tool
How do I merge CSV files?
Upload two or more .csv files (or add them one by one), then click "Merge CSVs". Rows from all files are combined into one output using a unified column set.
What if my CSV files have different columns?
No problem. The tool creates a union of all columns — shared columns are matched automatically and missing cells are left empty.
Is merging CSV files free?
Yes, completely free with no limits on the number of files or rows, and no registration required.
Is my data safe?
Yes. Merging happens entirely in your browser — your files never leave your device and nothing is stored on a server.
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