With your cell selected, click on the menu bar Data - Validation
On the settings tab, change the allow drop down to Text Length
Change the data drop down to between
Enter 0 in minimum and 15 in maximum

Set the other tabs input message and error alert as required.

"Joël" wrote:

I work with Excel 2003
How can I limit the width of a cell to - for example - 15 chars ?
I mean, anything larger than 15 chars won't be accepted
Thanks for help
Joël