Excel Viewer

About Excel Viewer

Excel Viewer lets you open and preview Excel spreadsheets (.xlsx, .xls) directly in your browser. Switch between sheets, view data in a clean table format, copy to clipboard, or export individual sheets as CSV files—all without uploading sensitive data to a server.

Why use an online Excel viewer?

If you need to quickly preview an Excel file but don't have Microsoft Excel or LibreOffice installed, this browser-based viewer lets you inspect sheets, rows, and columns instantly. Perfect for verifying data, checking formulas results, or extracting specific tables.

Does my file leave my device?

No. All Excel parsing happens locally in your browser using the SheetJS library. Your spreadsheet data never leaves your machine, ensuring complete privacy for sensitive financial reports, customer lists, or confidential documents.

Can I export sheets to CSV?

Yes. After loading an Excel file, select any sheet and click "Download CSV" to export that sheet as a comma-separated values file. CSV files are universally compatible and can be opened in any spreadsheet application or text editor.

What if my file has multiple sheets?

The tool detects all sheets in your workbook and displays them in a dropdown menu. Simply select the sheet you want to view, and the table will update instantly. You can switch between sheets as many times as needed.

Are formulas evaluated?

The viewer displays the calculated values of formulas as they were saved in the Excel file. It does not recalculate formulas, so you see the same results you would see when opening the file in Excel.

What is the maximum Excel file size this viewer can handle?

Practical limit is 50-100MB depending on device RAM. SheetJS parses fully into memory. A 100MB workbook with 500k rows typically loads in 8-12 seconds on a modern laptop, longer on mobile. Use the row limit option to preview huge files quickly.

Are macros, VBA, formulas and conditional formatting preserved?

No. The viewer shows the LAST CALCULATED VALUE of each cell as stored in the .xlsx. Macros and VBA do not execute. Formulas are not re-evaluated. Conditional formatting, charts and pivot tables are stripped. For full fidelity you need Excel or LibreOffice.

Can I open password-protected XLSX files?

No. Password-encrypted .xlsx uses AES-128 or AES-256 with key derivation that requires user input. Remove the password in Excel first (File > Info > Protect Workbook > Encrypt with Password > clear field > save) then load the unencrypted file here.