Spreadsheets often hold payroll, customer lists or financials. Here is exactly how this reader avoids sending them anywhere, and how to check it yourself.
- Offline
- No upload
- Verifiable
Try it yourself
- Open this site once.
- Turn off your Wi-Fi or enable airplane mode.
- Reload the page and open a spreadsheet. It still works.
What stays on your device
The reader code and the spreadsheet library are served from this site, not a third party. Files you open are read in memory. If you choose to keep tabs between visits, they are stored in your own browser storage, and you can close a tab to delete its saved copy.
Frequently asked questions
Can I see network activity?
Yes. Open your browser developer tools, go to Network, then open a file. No request carries your data.