I encountered an issue with hyperref, as I wrote a long thesis. I have to \cite{} some references very often, then the back referencing becomes longer than one line (see the picture below). When this happens, I encounter the "Overfull \hbox" warning, which I really do not like (I want the output message without any warning and error). People seldom cite one reference in many pages, however, this is what I have to do. Since the back referencing number (links) becomes long, and do not break into multiple lines, this "Overfull \hbox" warning seems will not disappear, as I am continuing expanding my document pages (and citations to the same reference). Are there any way to suppress this warning, or a command to make long back referencing into multiple lines? Thank you very much!

enter image description here This is one example with long backref, which encoutered the "Overfull \hbox" warning. The below is how I use the [hyperref] package.

\usepackage[bookmarks=true, %only needed for PDF generation colorlinks,linkcolor=blue,citecolor=magenta,urlcolor=cyan, %link/ref/url colors linktoc=page,backref=page]{hyperref} %%backref=page in hyperref: back references in bibliography to show pages# of cited reference \hypersetup{breaklinks=true}

The warning is at \openout9 = `TestBackref.brf'. Overfull \hbox (15.64209pt too wide) in paragraph at lines

I finally put a link for minimal working example with bibliography (MWEB) at this link:


  • Welcome to TeX - LaTeX! You need to provide more details of your general set-up. This is best done as a minimal working example with bibliography (MWEB). Note that the latest hyperref documentation provides examples of ways of customising the back references. Perhaps those help. May 25, 2021 at 8:00
  • Andrew, thanks for comment. I put a link for the minimal working example with bibliography (MWEB) here: drive.google.com/file/d/1lZeTHZnV8AuW-x23jPEhFE8KLXdz-YMp/… When the backref lists become longer than one line, you want to suppress the warning "overfall \hbox", or you want to break into multiple lines. I think this is kind of bug with hyperref, as testing cases may have not considered such special situation. I would greatly appreciate if anyone can solve this issue, or if the hyperref team could improve this package itself. Thanks!
    – Henry
    May 25, 2021 at 20:56
  • This shows a more severe problem with hyperref, which I believe is a bug in the hyperref package. tex.stackexchange.com/questions/598588/…
    – Henry
    May 25, 2021 at 22:54
  • 1
    it is not a bug in hyperref, it is wrong user input. see tex.stackexchange.com/q/598588/2388 May 26, 2021 at 7:05
  • The link that Ulirke Fischer provides, give an answer that fixes the problem, so I believe this should be closed as a duplicate. May 26, 2021 at 10:59


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