Make footnote clickable both ways

Here is a suggestion using a KOMA-Script class together with package footnotebackref:

\documentclass{scrartcl}

\usepackage{footnotebackref}

\deffootnote{1.5em}{1em}{%
  \textsuperscript{\hyperref[\BackrefFootnoteTag]{\thefootnotemark}}\,%
}

\usepackage{blindtext}% dummy text
\begin{document}
Something here\footnote{foo}
\blindtext[2]
And another footnote is here\footnote{foobar}
\end{document}

\deffootnote is a KOMA-Script command und \BackrefFootnoteTag is defined by package footnotebackref.

---

Syntax of \deffootnote:

\deffootnote[<mark width>]{<indent>}{<parindent>}{<definition>}

If the optional argument is missing <indent> will be used as <mark width>. <parindent> is an additional indent if a new paragraph starts inside a footnote.

The defaults for the KOMA-Script classes are

\deffootnote[1em]{1.5em}{1em}
  {\textsuperscript{\thefootnotemark}}

This works out of the box for me with footnotebackref, the loading of hyperref is done by footnotebackref already.

\documentclass{article}

\usepackage{footnotebackref}
%\usepackage{hyperref}


\usepackage{blindtext}

\begin{document}

Something here\footnote{foo}

\blindtext[2]

And another footnote is here\footnote{foobar}

\end{document}