Check a budget, update data, work with formulas and charts, or switch between worksheets. Save as XLSX or export a PDF or CSV.
Files are opened and processed on your device, with no document upload or account required.
How it works
- Click Open your XLSX to launch the editor in your browser.
- Pick an .xlsx file from your device, or drag and drop it onto the page.
- It opens with the OnlyOffice engine — view it, or edit cells and watch formulas recalculate.
- Download it again as XLSX or CSV when you are done.
What you can do
- Open .xlsx (and .xls, .csv) file with formulas preserved
- Edit cells, then download again as XLSX or CSV
- No Microsoft Excel and no 365 subscription
- Local files are opened, edited and converted on your device, without a document-processing server. The source code is public for inspection and self-hosting.
- Try the features you need while online, then use what your browser has saved offline. Opening files from links still needs a connection.
It is just as good for a quick read-only look as for real work: sort a column, fix a figure, add a row or a formula, then hand the file back in the same format. This is handy when someone emails you a budget or a data export and you do not want to install Excel, pay for 365, or trust a random web converter with numbers you would rather keep private.
Frequently asked questions
Can I open an XLSX file without Excel?
Yes. It opens XLSX directly in your browser — no Excel or 365 subscription needed.
Are formulas and formatting kept?
Yes. The OnlyOffice engine preserves formulas, number formats and styling.
Is my spreadsheet uploaded?
No. When you open local files directly on this site, viewing, editing and conversion happen on your device without uploading your documents.
Can I export it to CSV?
Yes. Open it and download again as XLSX or CSV.
Does it work with old .xls files?
Yes. It opens .xlsx, older .xls and plain .csv files with the same engine.
Do my formulas recalculate?
Yes. It is a real spreadsheet engine, so formulas recalculate as you edit — not a static snapshot.
Are workbooks with multiple sheets supported?
Yes. Workbooks with several tabs open with all their sheets intact.