Merge CSV Files Online

Merge CSV Files Online works in the browser with local processing, preview and download. Files stay on your device.

Files are not sent to a server. Processing runs in your browser, and the queue handles one file at a time so the device stays responsive.

Drop CSV files here or tap to choose several files

No files selected.

Files are merged locally. Add several CSV files in the needed order. If the first row is the same header, it will remain only once.

First row is a common header Add source_file column Line ending

In queue0

Done0

Size saving-

Add CSV files.

How to use it

Add the files, choose the tool settings and check the first result before processing the full queue.

Start with the default values, then adjust one control at a time and review the preview. On phones, process fewer large files in one batch.

Your files are not uploaded to a server. The editor runs in your browser with local libraries from this site.

Large images can take longer on phones. If the browser slows down, process fewer files at once or choose a smaller output format.