Microsoft 365 is the right product when you need desktop Excel, enterprise admin, and deep Power Platform features. It is the wrong bill when you only needed to open one attachment, fix three cells, and send the file back.
This site runs the OnlyOffice spreadsheet engine in your browser as WebAssembly. For the local path, there is no Microsoft account wall and no upload — open the file, edit, download. If you later want the same workbook on every device, cloud sync is $5 a year — priced against a seat you do not want, not against "more Excel features."
What you can do
- Open .xlsx (and .xls, .csv) with formulas and formatting preserved
- Edit without installing desktop Office or paying for 365
- Keep the local path free and account-free
- Optionally sync workbooks to your account for $5/year
- Work offline as an installable PWA after the first load
How it works
- Click Open a local .xlsx to launch the editor.
- Pick the workbook from your device (or create a blank one).
- Edit cells; formulas recalculate in the tab.
- Download the result, or sign in later if you need cloud sync.
What this is not
This is not a full Microsoft 365 replacement. Skip it for VBA macros, heavy Power Query / Power Pivot, Teams-centric co-authoring, or IT-managed compliance suites. Those jobs belong in Excel or Google Workspace.
Frequently asked questions
Can I edit Excel files without Microsoft 365?
Yes. Local editing opens .xlsx in the browser with no 365 subscription. You only need an account here if you want optional cloud workbooks.
Do I need a Microsoft account?
Not for local open. The file is read into your tab and never sent to Microsoft through this site.
Is Excel for the web free too?
Microsoft offers Excel for the web with a Microsoft account. This local path is for people who want to avoid that account, avoid uploads to a random converter, or keep a cheap personal sync option at $5/year.
When should I pay $5 a year?
When the same workbook must follow you across devices or browsers. Local open stays free.