# \hfuzz

TEX provides commands that allow you to influence its decision as to whether it
considers a box is to be overfull and reported as such—for example in the `.log`

file.

`\hfuzz[=]`

*dimension*:`\hfuzz`

specifies the amount by which the content in an`\hbox`

can exceed the width of that`\hbox`

before being considered overfull.`\vfuzz[=]`

*dimension*:`\vfuzz`

specifies the amount by which the content in a`\vbox`

can exceed the height of that`\vbox`

before being reported as overfull.

Note that:

- “
`[=]`

” means that the equals sign is optional. *dimension*is an amount specified in units that TEX can understand—e.g., pt, bp, mm etc.

**Usage examples**

`\hfuzz=0.5pt`

or`\hfuzz 0.5pt`

(the “=” is optional)`\vfuzz=0.75pt`

or`\vfuzz 0.75pt`

(the “=” is optional)

#### Example

If we put the word “Overleaf” into an `\hbox`

and measure its width (using the
default fonts):

\setbox99=\hbox{Overleaf}\the\wd99

we see a value of 36.41675pt. If we now put “Overleaf” in an `\hbox`

that
is too narrow, say 36pt, and set `\overfullrule`

to a non-zero
value:

\overfullrule=5mm \hbox to 36pt{Overleaf}

The following graphic shows the output:

If we we set `\hfuzz=0.5pt`

and repeat the above exercise:

\overfullrule=5mm \hfuzz=0.5pt \hbox to 36pt{Overleaf}

the following graphic:

shows that TEX no longer treats `\hbox to 36pt{Overleaf}`

as overfull, thus does
not add an `\overfullrule`

rule, because the value of `\hfuzz`

(0.5pt) is
just enough to prevent that.

The behaviour of `\vfuzz`

is analagous to `\hfuzz`

—except that TEX does not display
overfull rules for vboxes.

#### More detail on `\hfuzz`

What TEX *actually* checks is the difference between the excess width of the material and the total (zero order) shrink glue. For example, suppose the total width of some content is 100pt and the desired box width is 95pt: the excess width that TEX needs to absorb is 5pt—it needs to shrink the available glue by 5pt. Suppose there is a total zero order glue shrink of 4pt, then TEX compares the current value of `\hfuzz`

with the value of 5pt\(-\)4pt\(=\)1pt.

#### Related commands

See also:

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