About CSV Toolbox

CSV Toolbox is a collection of free utilities for everyday CSV work: splitting, merging, deduplicating and converting files.

It was built around one principle: your data should never leave your device. Every tool runs entirely in your browser using streaming processing in a background worker. There are no servers handling your files, no accounts, no usage limits and no premium tier. That design also makes the tools fast: a multi-hundred-megabyte file processes in seconds because there is no upload step at all.

The site is open source — you can inspect exactly how your files are handled in the repository on GitLab. It is supported by unobtrusive advertising, which keeps every tool free for everyone.

Questions or feature requests? Get in touch.