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Select one or more cells and click. The formatting is saved in the Excel file; what the file already had (borders, font) stays.
Function library
Insert function
Sort & filter
Summarise
Charts
Data tools
Sorting takes the block around the selected cell; a header row above it (text above numbers) stays in place. If no header row can be recognised, it starts at the row of the selected cell. Formulas move with their row.
Proofing
Notes
Statistics
Help
Show
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Formulas stay formulas in the file; Excel recalculates them as soon as you open it. Type for example =SUM(A1:A10) or =IF(B2>100,"yes","no") — both comma and semicolon are accepted.
An .xlsx you open is not rebuilt: the original file is kept in full and only the cells you touch are rewritten inside it. Charts, images, pivot tables and cell formatting therefore stay. If you change the structure of the sheet (inserting rows or columns, sorting, merging, column width), that is no longer possible and the file is rebuilt after all — the tool says so when that happens.
Examples
Open an Excel file (xlsx, xls, csv or ods), edit the cells in a spreadsheet grid and save it again as .xlsx — no Office needed, 100% in your browser. Formulas are preserved and keep calculating when you open the file in Excel afterwards.
