Privacy

Your files never leave your device.

CSV processing

When you choose a file, the browser reads it with the File API into memory in this tab. Parsing, diagnosis, comparison, and repair run in JavaScript on your computer. There is no server endpoint that accepts CSV contents. Download uses a locally created Blob.

Sample files used by “Try a sample” are created in memory from code already in the page. They are not fetched from a server when you click them, and they are not your data.

What this site may collect later

The tools do not require cookies, analytics, or advertising. If analytics or Google AdSense are added later, they will load on page views only and still will not receive CSV contents — those never leave the tab. This policy will be updated before any such script is enabled.

Contact form

The contact page opens your own email client. If you send a message, you send it to us through your mail provider, not through a CSV upload.

Hosting

The static website files (HTML, CSS, JavaScript, fonts) are served by a host such as Cloudflare Pages. The host can see normal web request logs (IP address, URL, user agent) for the pages you load. That is not your spreadsheet.

Last updated: 20 September 2026.