Merge csv files

The CSV Merger tool allows you to quickly and easily combine multiple CSV files into a single, well-formatted file. It automatically detects and aligns matching headers, ensuring that your data stays accurate and consistent. Whether you are merging data exports, reports, or spreadsheets, this online CSV Merger saves time and eliminates manual work.

Select one or more .csv files. Files will be parsed in selected encoding.
Preview (first 20 rows)
Result CSV
All interface text is in English. This runs fully in your browser — no files are uploaded to any server.

Frequently Asked Questions

The CSV Merger tool allows you to quickly and easily combine multiple CSV files into one unified file. It automatically aligns matching headers and merges data while keeping the structure consistent and organized.

Simply upload two or more CSV files, and the tool will automatically detect common headers and merge the data. You can preview the result before downloading the final merged CSV.

Yes, the tool automatically detects and preserves matching headers, ensuring your merged file stays consistent with the original structure.

Yes. When files have different headers, the tool includes all unique columns and fills missing values with blanks, keeping your dataset complete.

No. All processing is done locally in your browser using JavaScript, ensuring your data remains private and never leaves your computer.

The tool supports standard CSV files, but you can also upload semicolon-delimited or tab-separated files, as long as they follow a consistent format.

Yes, once the merge is complete, you can download the resulting file as a well-formatted CSV ready for use in Excel, Google Sheets, or other data tools.

Anyone who works with structured data � including analysts, marketers, developers, and researchers � can use the CSV Merger to combine reports, exports, and spreadsheets efficiently.

No installation or registration is required. The CSV Merger runs directly in your web browser on any device.