Excel (XLSX) Viewer

Runs in browser Office Documents

A private Excel viewer: drop a workbook and switch between its sheets, with cell values and calculated formula results, dates, percentages, bold cells, merged cells and Arabic right-to-left sheets. Hidden sheets can be shown. Charts, images and conditional formatting are not rendered — the numbers are.

Privacy: Processed locally in your browser. Your file is not uploaded.

What is inside a DOCX or XLSX file?

A .docx, .xlsx or .pptx file is a ZIP package of XML parts defined by ECMA-376 / ISO/IEC 29500 (Office Open XML): document text and styles, worksheets and shared strings, slides and layouts, plus relationships, media and a core-properties part with author, dates and revision metadata. That is why such files can be read, previewed and converted in the browser without Office installed — and why their metadata deserves a look before they are shared.

How to use Excel (XLSX) Viewer

  1. Drop an .xlsx file.
  2. Optionally show hidden sheets.
  3. Click "Open" and switch between the sheet tabs.
  4. Use Excel to PDF for a printable copy.

Excel (XLSX) Viewer features

  • Sheet tabs with the grid of each sheet
  • Values and formula results; dates and percentages formatted
  • Merged cells spanned; bold and alignment kept
  • Right-to-left sheets rendered right-to-left
  • Hidden sheets on request
  • Up to 2,000 rows × 60 columns per sheet, truncation reported
  • No upload

Excel (XLSX) Viewer example

A budget workbook

Input:

budget.xlsx — 3 sheets, merged title rows, percentages

Output:

Three tabs; the grid shows 12.5% and 1,234.00 as Excel does, merged headers spanning their columns

Frequently asked questions about Excel (XLSX) Viewer

Are formulas recalculated?

No — the values Excel last saved are shown. A workbook written by a program that stores formulas without their cached results shows empty formula cells, and one saved in manual calculation mode with recalculation before saving turned off can show out-of-date values.

How large a sheet can it show?

Up to 2,000 rows × 60 columns per sheet are rendered, and the summary tells you when a sheet was cut. Use Excel to PDF for a printable version of a wider sheet.

Does it show charts?

No. Values, formula results, merges, bold and alignment are rendered; charts, images, conditional formatting and comments are not.

Does it open .xls or .csv?

.xlsx only. For CSV, use CSV to PDF or open it in a spreadsheet; convert .xls to .xlsx in Excel or LibreOffice first.

Is my PDF uploaded to a server?

No. The file is opened and processed by your browser with WebAssembly and JavaScript; nothing is sent to Mutqan Soft or anyone else. Close the tab and the file is gone. Downloading the result needs a free account — no subscription, no payment.

Technical notes

exceljs reads the workbook; a display layer converts each cell value by type (rich text, hyperlinks, formulas with cached results, dates as YYYY-MM-DD with the time, or only the time, when the number format has one, percentages) and reads merges from the sheet model. The grid is a plain HTML table with rowSpan/colSpan, row and column headers, and dir="rtl" for right-to-left sheet views.

References