I recently created a small Notepad++ plugin called ZeroBasedColumn.

ZeroBasedColumn changes the column numbering in the Notepad++ status bar, so column counting starts from 0 instead of 1.

For example:

Standard Notepad++     ZeroBasedColumn

Col: 1            →    Col_: 0
Col: 2            →    Col_: 1
Col: 3            →    Col_: 2

It can be useful for developers and anyone working with zero-based indexes, fixed-width files, APIs, or data formats where character positions start at 0.

You can enable or disable it from:

Plugins → ZeroBasedColumn → Use zero-based column

The project is open source and available on GitHub:

ZeroBasedColumn on GitHub

I would really appreciate any feedback, suggestions, or bug reports.

Thank you!