How do I append a character to the end of every line in an Excel cell?

Use Substitute:

=SUBSTITUTE(A1,CHAR(10),";" & CHAR(10)) &";"

CHAR(10) is the Line Return.

Make sure the wrap text is on for the target cell

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Assuming that every item of the list is in a different row, you can use the concatenation character, '&'.

The formula would be:

=A1&";"

Application example

If you want to do it directly in the cell without using a second column and formulas, you can use custom formatting to achieve it.

In custom cell formats, enter @","

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Then you can apply that format across the full range of cells.

It won't actually exist in the cell contents, but it will be displayed on the screen, and if you copy to another application it will be there.

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