Alt code for check Learn how to use Alt Code for Check: Contrary to popular belief, checkmark symbols are not readily visible. In Microsoft Office, there are multiple ways to add a checkmark to Word, Excel, PDFs, and Google Docs, among other document types. Checking the Mark Alt Code is a procedure that is clearly marked. It's one of the code styles that enables users to add many checkmark types, such the White Heavy Check Mark with a green backing. Visit us: https://graphictutorials.net/check-mark-alt-code-list-for-windows-macos-and-html/