Security

Designed without CSV uploads

Splitting, combining, converting, and summarizing CSV files all happen in your browser. There is no processing server that stores your CSV contents, file names, column names, or values.

Each person's work remains in their own browser. The service does not use a shared server-side workspace from which another user could retrieve your CSV.

Protection and remaining risks

• Processing locally reduces the need to send CSV data over a network, but it cannot protect against every risk.
• Malicious browser extensions, malware, screen sharing, shared devices, and download-folder permissions are outside this site's control.
• Keep the source file, then check the result's row counts and content before relying on it.

Browser and file safety

Use an up-to-date major browser and operating system. For highly confidential data, disable unnecessary extensions and use a device that other people cannot access.

Large files can use a lot of your device's memory. If a tab stops during processing, the original file is not modified, but unsaved output may be lost.

Reporting a concern

If you find behavior that may be a vulnerability, report the steps to reproduce it and the likely impact without attaching real personal information or confidential CSV files. Please give the maintainer time to investigate before sharing details publicly.