How to Strikethrough Text in Excel Online

Strikethrough is a built-in toggle offered in Excel Online as part of font formatting options on the Home tab:

How to Strikethrough Text in Desktop Excel 

Most recently installed versions of Excel offer strikethrough as a specific formatting option under font effects. The following works in Excel 2019, Excel 2016, Excel 2013, and Excel 365: Alternatively, you might try keyboard shortcuts to toggle strikethrough text in Excel. Select the cell (or cells) desired, then press Ctrl+5. On macOS use Shift+Command+X or, on older macOS versions of Excel, such as Excel 2011 or Excel 2008, try Shift+Command+minus. To remove the strikethrough effect, select a cell (or cells), then repeat the process or keyboard shortcut detailed above.

How to Strikethrough Text in Excel on Android or iOS Devices

As of June 2019, neither Microsoft Excel on Android nor iOS offers built-in support for strikethrough text in the app. But you can still add strikethrough text and/or numbers into an Excel cell with the help of a website: