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Different types of keyboards are available and each is designed with a focus on specific features that suit particular needs. Today, most full-size keyboards use one of three different mechanical layouts, usually referred to as simply ''ISO'' ([[ISO/IEC 9995]]-2), ''ANSI'' ([[ANSI]]-[[INCITS]] 154-1988), and ''JIS'' ([[Japanese Industrial Standards|JIS]] X 6002-1980), referring roughly to the organizations issuing the relevant worldwide, United States, and Japanese standards, respectively. (In fact, the mechanical layouts referred such as "ISO" and "ANSI" comply to the primary recommendations in the named standards, while each of these standards in fact also allows the other way.) ANSI standard alphanumeric keyboards have keys that are on three-quarter inch centers ({{convert|0.75|in}}), and have a key travel of at least {{convert|0.15|in}}.{{citation needed|date=August 2020}}
[[File:Keyboard sizes.svg|thumb|A size comparison between typical keyboard form factors{{legend|#7cba76|compact}}{{legend-inline|#7cba76}}+ {{legend-inline|#55a5f2|tenkeyless}}<br /> {{legend-inline|#7cba76}}+ {{legend-inline|#55a5f2}}+ {{legend-inline|#fa9d36|full-size}}]]
Modern keyboard models contain a set number of total keys according to their given standard, described as 101, 104, 105, etc. and sold as "Full-size" keyboards.<ref>{{cite web |last1=Judd |first1=William |title=Full-size, TKL, 60% and more: a guide to mechanical keyboard sizes |url=https://www.keyboardco.com/blog/index.php/2017/08/full-size-tkl-60-and-more-a-guide-to-mechanical-keyboard-sizes/ |website=The Keyboard Company |date=9 August 2017 |access-date=18 October 2019 |archive-date=18 October 2019 |archive-url=https://web.archive.org/web/20191018134432/https://www.keyboardco.com/blog/index.php/2017/08/full-size-tkl-60-and-more-a-guide-to-mechanical-keyboard-sizes/ |url-status=live }}</ref> Modern keyboards matching US conventions typically have 104 keys while the 105 key layout is the norm in the rest of the world. This number is not always followed, and individual keys or whole sections are commonly skipped for the sake of compactness or user preference. The most common choice is to not include the numpad, which can usually be fully replaced by the alphanumeric section; such designs are referred to as "tenkeyless" (or TKL).<ref>{{cite web |title=TENKEYLESS <nowiki>|</nowiki> English meaning |url=https://dictionary.cambridge.org/dictionary/english/tenkeyless |website=Cambridge Dictionary |publisher=Cambridge University Press |access-date=1 November 2022 |archive-date=26 February 2021 |archive-url=https://web.archive.org/web/20210226025825/https://dictionary.cambridge.org/dictionary/english/tenkeyless |url-status=live }}</ref> Laptops and wireless peripherals often lack duplicate keys and ones seldom used. Function- and arrow keys are nearly always present.
Another factor determining the size of a keyboard is the size and spacing of the keys. The reduction is limited by the practical consideration that the keys must be large enough to be easily pressed by fingers. Alternatively, a tool is used for pressing small keys.
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