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Excel Viewer

Open .xlsx and .xls workbooks in your browser — no upload, no account. Switch sheets, read cached formulas, and export any sheet as CSV.

Your data never leaves your device
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Frequently Asked Questions

  • Does my file upload anywhere?

    No. SheetJS runs entirely in your browser. The workbook never leaves your device.

  • Can I edit cells?

    Not in this tool — it is read-only by design. Export the active sheet as CSV and use the CSV Wrangler tool for filter, sort and dedupe workflows.

  • Are formulas recomputed?

    No. We show the cached value Excel saved alongside the formula. All formulas on the active sheet are listed in the collapsible "Formulas" section beneath the table, keyed by A1 address.

  • How does this handle merged cells or formatted numbers?

    Merged cells are displayed unmerged — the value stays in the top-left cell only and the other cells appear empty. Numbers and dates are shown the way Excel saved them (so "1,234.56" or "1/15/24" stay as strings). When you export to CSV the formatted text is preserved, which is useful for display but may need cleanup if you want to re-import numbers in another spreadsheet.