Privacy Policy
Effective date: July 1, 2026
Your files never leave your device
Every repair CSVUndo performs — converting scientific notation back to full numbers, restoring leading zeros, fixing broken characters — runs entirely inside your browser using JavaScript. When you choose a file, your browser reads it into memory, processes it locally, and hands the corrected version back to you as a download. The contents of your file are never transmitted to our servers or to anyone else's. There is no upload code on this site, so we could not read your data even if we wanted to. When you close the tab, the file is gone from memory.
You can verify this yourself: open your browser's developer tools, switch to the Network tab, and repair a file. You will see the page and its assets load, and nothing else — no request carries your data out.
No accounts, no cookies from us
CSVUndo has no signup, no login, and no user profiles. We do not set cookies, and we do not run analytics scripts that identify or track you across other sites. There is nothing to unsubscribe from because we never asked for your email in the first place.
Advertising
To keep these tools free, we may display advertising served by Google AdSense. Once ads are enabled, Google and its certified partners may set cookies or use device identifiers to measure ad performance and, where permitted, show ads based on your visits to this and other websites. Those cookies belong to Google, not to us, and they have no access to the files you repair. You can read how Google uses data in Google's advertising policies, and you can opt out of personalized ads at adssettings.google.com or by blocking third-party cookies in your browser.
Server logs
Like virtually every website, our hosting provider keeps standard access logs. These record the IP address, browser user agent, requested page, and timestamp of each visit. We use them only to keep the site secure and running — spotting abusive traffic, diagnosing outages, and blocking attacks. Logs are kept for a limited period and then discarded. They never contain the contents of your files, because your files are never sent to the server.
What we will never do
- Sell, rent, or trade any information about you to anyone.
- Upload, inspect, store, or retain the CSV files you repair.
- Require personal information of any kind to use the tools.
Changes to this policy
If the way the site works ever changes — for example, if we add an optional feature that requires a server — we will update this page and move the effective date at the top. Material changes will be noted plainly, not buried.
Questions
If anything here is unclear, or you would like more detail about how the repairs work, reach us through the contact page. We answer.