DeskDazzle's spreadsheet editor opens .xlsx, .xls, .ods and .csv files and saves .xlsx or .csv, with more than 120 formulas computed on your own device. There is no upload step and no account: the file is read, recalculated and written in the browser tab you already have open.
How to open an .xlsx file without Excel
Drag the .xlsx, .ods or .csv file onto the page, or use Open to pick it.
Edit cells, add formulas, and use the formula bar exactly as you would in a desktop spreadsheet.
Save as .xlsx to keep formulas and formatting, or export .csv for plain data.
Nothing was transmitted. The formula engine ran in your browser, on your machine.
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Questions
Which spreadsheet formats can it open?
.xlsx, .xls, .ods and .csv. It saves .xlsx and .csv, and can export the sheet as a PDF.
Does it support formulas?
Over 120 of them — arithmetic, statistical, logical, lookup, text and date functions. They recalculate on your device as you type, with no round trip to a server.
Is it a free replacement for Excel?
For opening, editing and saving spreadsheets and running everyday formulas, it does the job with no licence. Pivot tables, macros and Power Query are Excel features it does not have.