Open .xlsx files online
You can open .xlsx workbooks in your browser with the spreadsheet editor. XLSX is its native format, with formulas, tables and charts. Nothing is uploaded and there is no sign-up. We have not published an open test for specific workbooks yet.
Best on a desktop browser. This editor has desktop menus and shortcuts.
Can I open it?
tested 2026-10-12 · engine 0.5.0 · chromium 152 desktop · local server
| Check | Result | Notes |
|---|---|---|
| Listed by the engine | Listed in docs | XLSX is the native format: styles, formulas, tables, charts and pictures. |
| Opened a .xlsx file in our test | Not tested yet | We have not published an open test for this format yet. |
| Editor starts | Works | Loaded without problems |
FAQ
Do I need Excel to open an XLSX file?
No. The spreadsheet editor opens XLSX files in your browser.
Are formulas kept?
Formulas are listed as supported. We have not tested specific workbooks yet.
Is my file uploaded?
No. It is read by code running in your browser.