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#Using Emacs Emacs comes with an untabify function:

untabify is an interactive autoloaded compiled Lisp function in tabify.el.

(untabify START END &optional ARG)

Convert all tabs in region to multiple spaces, preserving columns. If called interactively with prefix ARG, convert for the entire buffer.

Called non-interactively, the region is specified by arguments START and END, rather than by the position of point and mark. The variable tab-width controls the spacing of tab stops.

This can be used interactively in the normal way with M-x, or bound to a key sequence.