Excel Viewer — Open XLSX & XLS Spreadsheets Online, Free
Open .xlsx or .xls spreadsheets with sheet tabs and formatted tables, rendered locally — no Excel license, no upload.
1. Choose or drop a file
2. View instantly
3. Download when done
What this viewer does
- Switch between every sheet in the workbook
- Formatted table view with column headers
- Handles formulas' last-calculated values
- Works with large workbooks
- Export the current sheet to CSV
How it's rendered
SheetJS. Parses the spreadsheet binary/XML locally and renders each sheet as a table.
Nothing about this file is ever sent to a server — open your browser's DevTools Network tab while using this viewer and you'll see no request carrying your file's contents.
100% Private
Files never leave your device. There is no server that ever receives your file's contents.
No Uploads
Every format is decoded and rendered locally via WebAssembly or JavaScript. Open your browser's Network tab and confirm nothing is sent.
No Storage
Nothing is written to a server or database. Memory clears the moment you close or reload the tab.
GDPR-friendly by design
There's no file data collection to comply with in the first place — no account, no tracking of file contents, no analytics on what you view.
Excel (XLSX) viewer — FAQ
Which formats are supported?
Modern .xlsx and legacy .xls both open, along with .csv.
Are my formulas visible?
The viewer shows calculated values as stored in the file, not live formula recalculation.
Is there a row/column limit?
No artificial limit — very large sheets are only bounded by your device's memory.
Can I view multiple sheets?
Yes, every sheet tab in the workbook is listed and switchable.
Is the spreadsheet ever uploaded?
No — it's parsed and rendered entirely in your browser with SheetJS.