Open an .xlsx in your browser

Drop a workbook and this page parses it with the real @office-kit/xlsx source, then shows each cell as getCellDisplayText reads it: the value put through the cell’s number format. Nothing is uploaded: the whole pipeline runs in this tab.

The preview draws values, number formats, fonts, fills, borders, merges, and column widths. It does not draw charts, images, or conditional formats, and formulas show the result Excel cached, because the library never calculates. The re-saved file is the loaded workbook written back out by the library, with everything it does not model carried through. For files too large to load whole, see streaming.