I want to remove the small space after footnote mark (it especially visible before punctuation marks). MWE
\documentclass{article}
\begin{document}
Text\footnote{first}. Text\footnote{second} continues.
\end{document}
I've tested the negative kern, but the space is different depending on overall line space.
Text$^1$.
gives bare-eye identical result. Of course you are always free to use\!
to manually fix it.