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((Refimprove|article|date=March 2021))

'''Font substitution''' is the process of using one [[typeface]] in place of another when the intended typeface either is not available or does not contain [[glyph]]s for the required [[Codepoint|characters]].

Font substitution can be aided by:
* classifying fonts into [[font family|generic font families]], such that for example a [[sans serif]] font is substituted by another sans serif font. 
* font substitutions defined in operating system's font configuration for concrete font names (font families), such that for example [[Arial]] font is substituted by metric-compatible font [[Liberation Sans]] or [[Nimbus Sans L]].
* font substitutions defined in application software's (e.g. text processor) font configuration for concrete font names.

When font substitution is being used to find a replacement for an unavailable character, it can lead to inconsistent visual appearance as part of a word or sentence is displayed in one font and another part is displayed in the substituted font. A method to work around this problem is to display the entire word or paragraph in the substituted font.  Nevertheless, font substitution may be critical to scripts not well supported by a large font inventory having the required Unicode range.

Examples of systems that perform font substitution include [[fontconfig]], [[Adobe Reader]], [[Unidrv]], [[Microsoft Word]] (since Word 2002), [[LibreOffice|Libre Office]] and [[OpenOffice.org]].<ref>((Cite web|title=Fonts - LibreOffice Help|url=https://help.libreoffice.org/3.4/Common/Fonts|access-date=2021-03-22|website=help.libreoffice.org))</ref> Not all systems that claim to offer font substitution are able to substitute for missing characters; some are only capable of substituting for missing fonts.

Major modern [[web browser]]s are capable of font substitution.

==See also==
* [[Fallback font]]
* [[Web typography]]

==References==
((Reflist))

==External links==
* [http://library.gnome.org/admin/system-admin-guide/2.32/fontconfig-4.html.en Description of font substitution in fontconfig]
* [https://www.mozilla.org/projects/intl/fonts.html Mozilla on the utility of font switching]

[[Category:Digital typography|Substitution]]


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