Question 1

Is my data uploaded to a server?

Accepted Answer

No, absolutely not. All file processing happens entirely in your browser using JavaScript. Your data never leaves your device, making this tool completely safe for sensitive information.

Question 2

What formulas are supported?

Accepted Answer

Currently supported formulas include: SUM (add values), AVERAGE/AVG (calculate mean), COUNT (count cells), MIN (minimum value), and MAX (maximum value). Use them with cell references like =SUM(A1:A10).

Question 3

Can I open Excel files?

Accepted Answer

Yes! You can import both .xlsx and .xls Excel files directly. They will be converted for editing and you can export back to Excel format when done.

Question 4

Is there a file size limit?

Accepted Answer

The tool works best with files under 100,000 rows. Larger files may cause slower performance as all processing happens in your browser.

Question 5

Can I undo my changes?

Accepted Answer

Yes! Use Ctrl+Z (or Cmd+Z on Mac) to undo changes. The editor keeps up to 50 undo states, so you can safely experiment with your data.