XLSX Viewer
Read your workbook, one sheet at a time.
View XLSX worksheets with supported formula calculation, number/date formats, basic styles, search/filter/sort and unchanged source downloads.
Phase 2 supports a defined formula subset, basic RGB font/fill/alignment styles and number formats. Unsupported formulas show errors locally and export as literal expression text. Shared/array/data-table formulas, charts, images, merges, tables, validations, comments, protection and advanced styling are not preserved as live features. Keep the original workbook and inspect exports in Excel or LibreOffice.
Enable JavaScript to process XLSX files locally.
How to use XLSX Viewer
- Open a workbook or try the sample.
- Navigate worksheets and inspect raw, calculated and formatted values.
- Apply search, column filters or stable view sorting. Exports always include the full workbook.
- Download the unchanged source when needed.
Phase 2 supports a defined formula subset, basic RGB font/fill/alignment styles and number formats. Unsupported formulas show errors locally and export as literal expression text. Shared/array/data-table formulas, charts, images, merges, tables, validations, comments, protection and advanced styling are not preserved as live features. Keep the original workbook and inspect exports in Excel or LibreOffice.
Limits remain 20 sheets, 10,000 rows and 256 columns per sheet, 100,000 stored cells / 1,000,000 text characters, 10 MiB compressed and 64 MiB expanded ZIP content. No recovery storage is used in Phase 2.
Useful answers
What is supported in Phase 2?
A bounded formula subset, basic RGB font/fill/alignment styling, stored number formats, 1900/1904 date systems, search/filter/sort views and editor bulk previews. Exports retain supported normal formulas and styles, or optionally flatten to calculated values.
What happens to unsupported formulas?
They show an explicit error with a reason. Old caches remain inspectable but are not used as verified results. Supported-feature export writes unsupported expressions as literal text; values-only export writes the visible error. No external or network formula executes here.
What does export omit?
Phase 2 supports a defined formula subset, basic RGB font/fill/alignment styles and number formats. Unsupported formulas show errors locally and export as literal expression text. Shared/array/data-table formulas, charts, images, merges, tables, validations, comments, protection and advanced styling are not preserved as live features. Keep the original workbook and inspect exports in Excel or LibreOffice.
Are my files uploaded?
No. Files are processed locally with bundled libraries. No external data is fetched and no recovery draft is stored in Phase 2.
Does this replace Excel?
No. The formula and formatting subset is documented. Fonts, custom number formats and unsupported workbook structures can differ; inspect downloaded workbooks in Excel or LibreOffice.
More Office Tools
A practical workflow
Open a workbook and inspect a cell’s raw value alongside the supported displayed result. Use the editor when you need to change worksheet data.
Read the scope alongside the result
Unsupported formulas and workbook structures are not fully reproduced. Cached values are not verified calculations, and filtering the view does not restrict export membership.