View source for AltGr key

{{Short description|Modifier key on some computer keyboards}}
{{redir|RAlt|the manufacturer of racing cars|Ralt}}
{{Use dmy dates|date=June 2020}}
 {{more citations needed|date=April 2017}}
[[File:AltGr - Lenovo.jpg|thumb|The AltGr key is the first key to the right of the space bar.]]
'''AltGr''' (also '''Alt Graph''') is a [[modifier key]] found on [[computer keyboard]]s. It is primarily used to type characters that are used less frequently in the language that the keyboard is designed for, such as foreign [[currency symbol]]s, [[List of typographical symbols and punctuation marks|typographic mark]]s and [[precomposed character|accented letters]].<ref>{{cite web|title=What is AltGr key?|date=10 January 2024 |url=https://www.atulhost.com/what-is-altgr-key}}</ref> 
The AltGr key is used to access a third and a fourth{{efn|when {{keypress|Shift}} is also pressed}} [[grapheme]] for most keys. Most are accented variants of the letters on the keys, but some are additional [[List of typographical symbols and punctuation marks|symbols and punctuation marks]]. For example, when the US-International [[keyboard mapping]] is active, the {{keypress|C}} key can be used to insert four different characters:
* {{keypress|C}} → c ([[lowercase]] — first level)
* {{keypress|[[shift key|Shift]]|C}} → C ([[uppercase]] — second level)
* {{keypress|AltGr|C}} → © ([[copyright sign]] — third level)
* {{keypress|AltGr|[[shift key|Shift]]|C}} → ¢ ([[cent sign]] — fourth level)

Some languages, such as [[Bengali language|Bengali]], use this key when the number of letters of their alphabet is too large for a standard keyboard. On [[keyboard layout]]s that do not include an AltGr key, such as US keyboards, the key position is labelled as a right-hand [[Alt key]]. When a relevant keyboard mapping is chosen in the operating system, this key will function separately as AltGr (despite being marked identically to the left-hand Alt key).<ref>{{cite web|last=Microsoft Support|title=How to use the United States-International keyboard layout in Windows 7, in Windows Vista, and in Windows XP|url=https://support.microsoft.com/en-us/help/306560/how-to-use-the-united-states-international-keyboard-layout-in-windows|publisher=Microsoft|access-date=30 May 2020}}</ref> In [[macOS]], the [[Option key]] has functions similar to the AltGr key.

==History==
{{anchor|alternate graphic}}
IBM states that ''AltGr'' is an [[abbreviation]] for '''alternate graphic'''.<ref name="IBM-1" /><ref name="IBM-2" />

[[File:Compose key on Sun Type 5c keyboard.jpg|thumb|right|250px|[[Sun Microsystems]] keyboard, which labels the key as ''Alt Graph'']]
A key labelled with some variation of "Alt Graphic" was on many computer keyboards before the Windows international layouts. On early home computers the alternate graphemes were primarily [[box-drawing characters]].<ref name="Kaplan" />

This likely was the intended purpose of the [[Alt key]] on PC keyboards, however software quickly used this as a combination key for shortcuts, requiring a new key for producing additional characters.

===Ctrl+Alt===
Windows interprets {{keypress|Ctrl|Alt}} as {{keypress|AltGr}}, to accommodate some compact keyboards like those of [[netbook]]s which have neither the AltGr key nor a right-hand Alt key. Thus {{keypress|Ctrl|Alt|a}} has the same effect as {{keypress|AltGr|a}}. Because of this feature, Microsoft advises that {{keypress|Ctrl|Alt}} not be used as part of any application keyboard shortcut, as it would prevent typing the matching {{keypress|AltGr}} character on such keyboards.<ref name=Chen>{{cite web|url= https://devblogs.microsoft.com/oldnewthing/20040329-00/?p=40003 | title = Why Ctrl+Alt shouldn't be used as a shortcut modifier | author = Raymond Chen | date = 29 March 2004 | publisher = Microsoft}}</ref>{{efn|In general the substitution for the AltGr-key with  {{keypress|Ctrl|Alt}} works as expected, but in some programs unexpected results can occur. For example in a local MS Outlook 365 installation the  key combo {{keypress|Ctrl|Alt}} is not recognized as an AltGr.}}

== Function by default national keyboard==
In most of the keyboard diagrams the symbol one gets when holding down AltGr is in blue in the lower-right of the corner. If different, the symbol for Shift+AltGr is shown in the upper-right.

===Bangladesh===
[[File:KB-Bengali-Jatiyo.svg|none|thumb|597x597px|Jatiya layout (Alt Gr activated characters in blue)]]

=== Belgium ===
[[File:Belgian Linux keyboard.svg|thumb|left|597x597px|Belgian keyboard under Linux (Ubuntu 9.10)]]{{clear}}

The Windows version of the [[AZERTY#Differences between the Belgian and French layouts of the AZERTY keyboard|Belgian keyboard]] may only support a subset of these characters. Several of the AltGr combinations are themselves [[dead key]]s, which are followed by another letter to produce an accented version of that letter.

=== Brazil ===
[[File:KB Portuguese Brazil.svg|none|thumb|597x597px|ABNT complying keyboard layout (Alt Gr activated characters in blue)]]
<br />
[[File:KB Portuguese Brazil ABNT2.svg|none|thumb|597x597px|ABNT2 complying keyboard layout (Alt Gr activated characters in blue)]]

==== Some notes ====
* The {{keypress|AltGr|C}} combination results in the (obsolete) symbol ₢ for the former Brazilian currency, the [[Brazilian cruzeiro (disambiguation)|Brazilian cruzeiro]].
* The {{keypress|AltGr|Q}}, {{keypress|AltGr|W}}, {{keypress|AltGr|E}} combinations are useful as a replacement for the "/?" key, which is physically absent on non-Brazilian keyboards.
* Some software (e.g. Microsoft Word) will map {{keypress|AltGr|R}} to ® and {{keypress|AltGr|T}} to ™.

=== Finland ===
[[File:KB_Finnish_Multilingual.svg|thumb|597x597px|The original design for the Finnish Multilingual Keyboard, [[dead key]]s in red; Icelandic and Faroese [[Eth|Ð/ð]] is on the D key, the Sámi [[D with stroke|Đ/đ]] available using the AltGr diacritic on L]]

The new Finnish keyboard standard of 2008 ([[SFS 5966]]) was designed for easily typing 1) Finnish, Swedish, Danish and Norwegian; 2) [[Nordic countries|Nordic]] minority languages and 3) European Latin letters (based on [[Unicode#Standardized subsets|MES-2]], with emphasis on contemporary proper nouns), without needing engravings different from those on existing standard keyboards of Finland and Sweden. AltGr and [[Dead key|dead]] diacritic keys are extensively used, although letters of Finnish and Swedish are mostly provided as normal keys.<ref>{{cite web|url=http://www.kotoistus.fi/nappaimisto/fi_kbspec_fi_luonnos06.pdf |title=Suomalainen monikielinen näppäimistökaavio, viimeiseksi tarkoitettu luonnos |archive-url=https://web.archive.org/web/20110720190644/http://kotoistus.fi/nappaimisto/fi_kbspec_fi_luonnos06.pdf |archive-date=2011-07-20 |language=fi |date=2006-06-20 }}</ref>

=== France ===
On [[Keyboard layout#AZERTY|AZERTY keyboards]], AltGr enables the user to type the following characters:
[[File:KB France.svg|none|thumb|597x597px|French AZERTY keyboard]]

=== Germany ===
On [[German keyboard layout|German keyboards]], AltGr enables the user to type the following characters, which are indicated on the keyboard:
[[File:KB Germany.svg|none|thumb|597x597px|German keyboard layout "T1" according to DIN 2137-1:2012-06]]

[[Windows 8]] introduced the ability of pressing {{keypress|AltGr|Shift|ß}} to produce '''ẞ''' ([[capital ß]]). Even though this is usually not indicated on the physical keyboard—potentially due to a lack of space, since the ß-key already has three different levels ({{keypress|ß}} → "ß", {{keypress|Shift|ß}} → "?", and, as shown above, {{keypress|AltGr|ß}} → "\")—, it can be seen in the Windows [[Virtual keyboards|On-Screen Keyboard]] by selecting the necessary keys with the German keyboard layout selected. Some newer types of German keyboards offer the assignment {{keypress|AltGr|H}} → capital ß.

=== Greece ===
[[File:KB Greek.svg|600px|A Greek keyboard layout]]

Some of these key combinations also result in different characters if the [[polytonic]] layout is used.

=== Israel ===
==== Hebrew====
On [[Hebrew keyboard]]s, AltGr enables the user to type the [[Niqqud#Keyboard|Hebrew vowels and pronunciation marks]].
In addition, there are several combinations for special characters:
{{Col-begin}}
{{Col-break|width=25%}}

* {{keypress|AltGr|3}} → <big>[[Euro sign|€]]</big>
* {{keypress|AltGr|4}} → <big>[[Shekel sign|₪]]</big>
* {{keypress|AltGr|5}} → <big>[[Degree sign|°]]</big>
* {{keypress|AltGr|6}} → <big>[[Ole (cantillation)|֫]]</big>
* {{keypress|AltGr|7}} → <big>[[Meteg|ֽ]]</big>
* {{keypress|AltGr|8}} → <big>[[Multiplication sign|×]]</big>
* {{keypress|AltGr|9}} → <big>[[Left-to-right mark|LRM]]</big>
* {{keypress|AltGr|0}} → <big>[[Right-to-left mark|RLM]]</big>
{{Col-break}}
* {{keypress|AltGr|-}} → <big>[[Hebrew punctuation#Hyphen and maqaf|־]]</big>
* {{keypress|AltGr|{{=}}}} → <big>[[Dash#En dash|–]]</big>
* {{keypress|AltGr|.}} → <big>[[Division sign|÷]]</big>
* {{keypress|AltGr|ך}}&lrm; → <big>[[Quotation mark|”]]</big>
* {{keypress|AltGr|Shift|ך}}&lrm; → <big>[[Quotation mark|“]]</big>
* {{keypress|AltGr|ף}}&lrm; → <big>[[Quotation mark|„]]</big>
* {{keypress|AltGr|ת}}&lrm; → <big>[[Quotation mark|’]]</big>
{{Col-break}}
* {{keypress|AltGr|Shift|ת}}&lrm; → <big>[[Quotation mark|‘]]</big>
* {{keypress|AltGr|ץ}}&lrm; → <big>[[Quotation mark|‚]]</big>
* {{keypress|AltGr|;}} → <big>[[Geresh|׳]]</big>
* {{keypress|AltGr|,}} → <big>[[Gershayim|״]]</big>
* {{keypress|AltGr|Shift|נ}}&lrm; → <big>[[Inverted nun|׆]]</big>
{{Col-end}}

==== Yiddish ====
Using a Hebrew keyboard, one may write in [[Yiddish language|Yiddish]] as the two languages share many letters. However, Yiddish has some additional digraphs not otherwise found in Hebrew, which are entered via AltGr:
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* {{keypress|AltGr|י}}&lrm; → {{Script/Hebrew|1=<span style="font-family:'Times New Roman',David,Narkisim,Rod; font-size:large">ײ</span>}}
* {{keypress|AltGr|ע}}&lrm; → {{Script/Hebrew|1=<span style="font-family:'Times New Roman',David,Narkisim,Rod; font-size:large">ױ</span>}}
* {{keypress|AltGr|ט}}&lrm; → {{Script/Hebrew|1=<span style="font-family:'Times New Roman',David,Narkisim,Rod; font-size:large">װ</span>}}
{{Col-end}}

=== Italy ===
<!-- Image with unknown copyright status removed: [[File:Italian Extended Keyboard Layout.png|thumb|Not all pictured key combinations are available on all operative systems. {{deletable image-caption}}]] -->
On [[Keyboard layout#Italian|Italian keyboards]], AltGr enables the user to type the following characters:
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{{Col-break|width=25%}}
* {{keypress|AltGr|E}} → <big>€</big>
* {{keypress|AltGr|5}} → <big>€</big>
* {{keypress|AltGr|ò}} → <big>@</big>
* {{keypress|AltGr|à}} → <big>#</big>
{{Col-break}}
* {{keypress|AltGr|è}} → <big>[</big>
* {{keypress|AltGr|+}} → <big>]</big>
* {{keypress|AltGr|Shift|è}} → <big>{</big>
* {{keypress|AltGr|Shift|+}} → <big>}</big>
{{Col-end}}

There is an alternate layout, which differ just in disposition of characters accessible through AltGr and includes the tilde and the curly brackets.

=== Latvia ===
The following letters can be input in the [[Latvian language|Latvian]] keyboard layout using AltGr:

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==== [[Lowercase letter]]s ====
* {{keypress|AltGr|A}} → <big>ā</big>
* {{keypress|AltGr|C}} → <big>č</big>
* {{keypress|AltGr|E}} → <big>ē</big>
* {{keypress|AltGr|G}} → <big>ģ</big>
* {{keypress|AltGr|I}} → <big>ī</big>
* {{keypress|AltGr|K}} → <big>ķ</big>
* {{keypress|AltGr|L}} → <big>ļ</big>
* {{keypress|AltGr|N}} → <big>ņ</big>
* {{keypress|AltGr|O}} → <big>ō</big>
* {{keypress|AltGr|R}} → <big>ŗ</big>
* {{keypress|AltGr|S}} → <big>š</big>
* {{keypress|AltGr|U}} → <big>ū</big>
* {{keypress|AltGr|Z}} → <big>ž</big>
{{Col-break}}

==== [[Uppercase letter]]s ====
* {{keypress|AltGr|Shift|A}} → <big>Ā</big>
* {{keypress|AltGr|Shift|C}} → <big>Č</big>
* {{keypress|AltGr|Shift|E}} → <big>Ē</big>
* {{keypress|AltGr|Shift|G}} → <big>Ģ</big>
* {{keypress|AltGr|Shift|I}} → <big>Ī</big>
* {{keypress|AltGr|Shift|K}} → <big>Ķ</big>
* {{keypress|AltGr|Shift|L}} → <big>Ļ</big>
* {{keypress|AltGr|Shift|N}} → <big>Ņ</big>
* {{keypress|AltGr|Shift|O}} → <big>Ō</big>
* {{keypress|AltGr|Shift|R}} → <big>Ŗ</big>
* {{keypress|AltGr|Shift|S}} → <big>Š</big>
* {{keypress|AltGr|Shift|U}} → <big>Ū</big>
* {{keypress|AltGr|Shift|Z}} → <big>Ž</big>
{{Col-end}}

===  North Macedonia ===
On [[Macedonian language|Macedonian]] keyboards, AltGr enables the user to type the following characters:
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* {{keypress|AltGr|е}} → <big>€</big>
* {{keypress|AltGr|ш}} → <big>Ђ</big>
* {{keypress|AltGr|ѓ}} → <big>ђ</big>
* {{keypress|AltGr|ф}} → <big>[</big>
{{Col-break|width=25%}}
* {{keypress|AltGr|г}} → <big>]</big>
* {{keypress|AltGr|ч}} → <big>Ћ</big>
* {{keypress|AltGr|ќ}} → <big>ћ</big>
* {{keypress|AltGr|в}} → <big>@</big>
{{Col-break}}
* {{keypress|AltGr|б}} → <big>{</big>
* {{keypress|AltGr|н}} → <big>}</big>
* {{keypress|AltGr|м}} → <big>§</big>
{{Col-end}}

=== Netherlands ===
{{hatnote|The [[US international keyboard]] (see below) is a popular alternative in the Netherlands.}}
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* '''Digits row'''
** {{keypress|AltGr|1}} → ¹ and ¡
** {{keypress|AltGr|2}} → ²
** {{keypress|AltGr|3}} → ³
** {{keypress|AltGr|4}} → £ and ¤
** {{keypress|AltGr|5}} → €
** {{keypress|AltGr|6}} → ¼
** {{keypress|AltGr|7}} → ½
** {{keypress|AltGr|8}} → ¾
** {{keypress|AltGr|9}} → ‘
** {{keypress|AltGr|0}} → ’
** {{keypress|AltGr|-}} → ¥
** {{keypress|AltGr|{{=}}}} → × and ÷
{{col-break}}
* '''Top letters row'''
** {{keypress|AltGr|Q}} → ä and Ä
** {{keypress|AltGr|W}} → å and Å
** {{keypress|AltGr|E}} → é and É
** {{keypress|AltGr|R}} → ®
** {{keypress|AltGr|T}} → þ and Þ (Icelandic and Old English thorn)
** {{keypress|AltGr|Y}} → ü and Ü
** {{keypress|AltGr|U}} → ú and Ú
** {{keypress|AltGr|I}} → í and Í
** {{keypress|AltGr|O}} → ó and Ó
** {{keypress|AltGr|P}} → ö and Ö
** {{keypress|AltGr|[}} → «
** {{keypress|AltGr|]}} → »
** {{keypress|AltGr|\}} → ¬ and ¦
{{col-break}}
* '''Middle letters row''' (Home row)
** {{keypress|AltGr|A}} → á and Á
** {{keypress|AltGr|S}} → ß (German eszett aka sharp s) and §
** {{keypress|AltGr|D}} → ð and Ð (Icelandic edh)
** {{keypress|AltGr|L}} → ø and Ø
** {{keypress|AltGr|;}} → ¶ and °
** {{keypress|AltGr|'}} → ´ and ¨
{{col-break}}
* '''Bottom letters row'''
** {{keypress|AltGr|Z}} → æ and Æ
** {{keypress|AltGr|C}} → © and ¢
** {{keypress|AltGr|N}} → ñ and Ñ
** {{keypress|AltGr|M}} → {{not a typo|µ}}
** {{keypress|AltGr|,}} → ç and Ç
** {{keypress|AltGr|/}} → ¿
{{col-end}}

=== Nordic countries and Estonia ===
The keyboard layouts in the [[Nordic countries]] [[Denmark]] (DK), [[Faroe Islands]] (FO), [[Finland]] (FI), [[Norway]] (NO) and [[Sweden]] (SE) as well as in [[Estonia]] (EE) are largely similar to each other. Generally the AltGr key can be used to create the following characters:
{{Col-begin}}
{{Col-break|width=33%}}
* {{keypress|AltGr|2}} → <big>@</big>
* {{keypress|AltGr|3}} → <big>£</big>
* {{keypress|AltGr|4}} → <big>$</big>
* {{keypress|AltGr|E}} → <big>€</big>
* {{keypress|AltGr|M}} → <big>{{not a typo|µ}}</big>
{{Col-break}}
* {{keypress|AltGr|7}} → <big>{</big>
* {{keypress|AltGr|8}} → <big>[</big>
* {{keypress|AltGr|9}} → <big>]</big>
* {{keypress|AltGr|0}} → <big>}</big>
* {{keypress|AltGr|¨}} → <big>~</big> (excluding EE)
{{Col-end}}

Other AltGr combinations are peculiar to just some of the countries:
{{Col-begin}}
{{Col-break|width=33%}}
* {{keypress|AltGr|+}} → <big>\</big> (EE, FI, [[Keyboard layout#Swedish|SE]])
* {{keypress|AltGr|<}} → <big>|</big> (EE, FI, SE)
* {{keypress|AltGr|<}} → <big>\</big> ([[Keyboard layout#Danish|DK]], [[Keyboard layout#Faroese|FO]])
* {{keypress|AltGr|´}} → <big>|</big> (DK, FO)
* {{keypress|AltGr|\}} → <big>´</big> ([[Keyboard layout#Norwegian|NO]])
* {{keypress|AltGr|ð}} → <big>~</big> (FO)
* {{keypress|AltGr|å}} → <big>¨</big> (FO)
{{Col-break}}
* {{keypress|AltGr|ø}} → <big>^</big> (FO)
* {{keypress|AltGr|5}} → <big>€</big> (NO, DK, FO, SE, sometimes FI)
* {{keypress|AltGr|S}} → <big>š</big> (EE, sometimes FI)
* {{keypress|AltGr|Z}} → <big>ž</big> (EE, sometimes FI)
* {{keypress|AltGr|Õ}} → <big>§</big> (EE)
* {{keypress|AltGr|'}} → <big>½</big> (EE)
{{Col-end}}

==== Finnish multilingual ====
The [[Keyboard layout#Finnish multilingual|Finnish multilingual]] keyboard standard adds many new characters to the traditional layout via the AltGr key, as shown in the image below (the blue characters can be written with the AltGr key; several [[dead key]] diacritics, shown in red, are also available as an AltGr combination).<ref name="SFS" /><ref name="Kotoistus" />

:[[File:KB Finnish Multilingual.svg|600px|Finnish multilingual keyboard layout]]

=== Poland ===
Typewriters in [[Poland]] used a [[QWERTZ]] layout specifically designed for the [[Polish language]] with [[diacritic|accented]] letters in the [[Polish alphabet]] obtainable directly. When personal computers became available worldwide in the 1980s, commercial importing into Poland was not supported by its communist government, so most machines in Poland were brought in by private individuals. Most had US keyboards, and various methods were devised to make available the accented Polish letters. An established method was to configure the [[Alt key|right{{nbsp}}Alt]] key as an AltGr key and to use it in combination with a Latin base letter to obtain the equivalent [[precomposed character]] (accented form of the letter). 
* {{keypress|AltGr|A}} → <big>[[ą]]</big>
* {{keypress|AltGr|C}} → <big>[[ć]]</big>
* {{keypress|AltGr|E}} → <big>[[ę]]</big>
* {{keypress|AltGr|L}} → <big>[[ł]]</big>
* {{keypress|AltGr|N}} → <big>[[ń]]</big>
* {{keypress|AltGr|O}} → <big>[[ó]]</big>
* {{keypress|AltGr|S}} → <big>[[ś]]</big>
* {{keypress|AltGr|U}} → <big>[[€]]</big>
* {{keypress|AltGr|X}} → <big>[[ź]]</big> 
* {{keypress|AltGr|Z}} → <big>[[ż]]</big>
(Because there are two types of "z with [[diacritic]]" ({{char|ź}} and {{char|ż}}), {{keypress|AltGr|X}} is a special case.)

At the time of the [[Fall of communism]] and opening of commercial import channels this practice was so widespread that it was adopted as the de facto standard. Nowadays nearly all PCs in Poland have standard US keyboards and use the AltGr method to enter Polish diacritics. This [[keyboard mapping]] is referred to as the ''Polish programmers' layout'' (''{{lang|pl|klawiatura polska programisty}}'') or simply ''Polish layout''.

Another layout is still used on typewriters, mostly by professional typists. Computer keyboards with this layout are available, though difficult to find, and supported by a number of operating systems; they are known as ''Polish typists' layout'' (''{{lang|pl|klawiatura polska maszynistki}}''). Older Polish versions of [[Microsoft Windows]] used this layout, describing it as ''Polish layout''. On current versions it is referred to as ''Polish (214)''.

=== Romania ===

The keymap with the '''AltGr''' key:
< Romanian standard
* {{keypress|AltGr|„}} → <big>`</big>
* {{keypress|AltGr|1}} → <big>~</big>
* {{keypress|AltGr|2}} → <big>ˇ</big>
* {{keypress|AltGr|3}} → <big>^</big>
* {{keypress|AltGr|4}} → <big>˘</big>
* {{keypress|AltGr|5}} → <big>°</big>
* {{keypress|AltGr|6}} → <big>˛</big>
* {{keypress|AltGr|7}} → <big>`</big>
* {{keypress|AltGr|8}} → <big>˙</big>
* {{keypress|AltGr|9}} → <big>´</big>
* {{keypress|AltGr|0}} → <big>˝</big>
* {{keypress|AltGr|-}} → <big>¨</big>
* {{keypress|AltGr|e}} → <big>€</big>
* {{keypress|AltGr|p}} → <big>§</big>
* {{keypress|AltGr|ă}} → <big>[</big>
* {{keypress|AltGr|î}} → <big>]</big>
* {{keypress|AltGr|â}} → <big>\</big>
* {{keypress|AltGr|s}} → <big>ß</big>
* {{keypress|AltGr|d}} → <big>đ</big>
* {{keypress|AltGr|D|Shift}} → <big>Đ</big>
* {{keypress|AltGr|l}} → <big>ł</big>
* {{keypress|AltGr|L|Shift}} → <big>Ł</big>
* {{keypress|AltGr|ș}} → <big>;</big>
* {{keypress|AltGr|ț}} → <big>'</big>
* {{keypress|AltGr|c}} → <big>©</big>
+ the signs mostly pressed with {{keypress|AltGr}} prints the US keyboard signs
Romanian standard>
  â  ß  €  r  ț  y  u  î  o  §  „  ”
   ă  ș  đ  f  g  h  j  k  ł  ;
     z  x  ©  v  b  n  m  «  »

=== Russia ===
Since release 1903, versions of Windows 10 have the binding:
* {{keypress|AltGr|8}} → <big>₽</big> ([[Ruble sign]])

=== South Slavic Latin and Czech keyboards===
On South Slavic Latin (used in Croatia, Slovenia, Bosnia and Herzegovina, Montenegro and Serbia) and on Czech keyboards, the following letters and special characters are created using AltGr:
{{Col-begin}}
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* {{keypress|AltGr|Q}} → <big>\</big>
* {{keypress|AltGr|W}} → <big>|</big>
* {{keypress|AltGr|E}} → <big>€</big>
* {{keypress|AltGr|Š}} → <big>÷</big>
* {{keypress|AltGr|Đ}} → <big>×</big>
* {{keypress|AltGr|F}} → <big>[</big>
* {{keypress|AltGr|G}} → <big>]</big>
* {{keypress|AltGr|K}} → <big>ł</big>
* {{keypress|AltGr|L}} → <big>Ł</big>
* {{keypress|AltGr|Ć}} → <big>ß</big>
{{Col-break|width=25%}}
* {{keypress|AltGr|Ž}} → <big>¤</big>
* {{keypress|AltGr|V}} → <big>@</big>
* {{keypress|AltGr|B}} → <big>{</big>
* {{keypress|AltGr|N}} → <big>}</big>
* {{keypress|AltGr|M}} → <big>§</big>
* {{keypress|AltGr|,}} → <big>&lt;</big>
* {{keypress|AltGr|.}} → <big>&gt;</big>
* {{keypress|AltGr|1}} → <big>~</big>
* {{keypress|AltGr|2}} → <big>ˇ</big>
* {{keypress|AltGr|3}} → <big>^</big>
{{Col-break}}
* {{keypress|AltGr|4}} → <big>˘</big>
* {{keypress|AltGr|5}} → <big>°</big>
* {{keypress|AltGr|6}} → <big>˛</big>
* {{keypress|AltGr|7}} → <big>`</big>
* {{keypress|AltGr|8}} → <big>˙</big>
* {{keypress|AltGr|9}} → <big>´</big>
* {{keypress|AltGr|0}} → <big>˝</big>
* {{keypress|AltGr|'}} → <big>¨</big>
* {{keypress|AltGr|+}} → <big>¸</big>
{{Col-end}}

:[[File:Qwertz-si.svg|600px|Slovenian/Croatian/Serbian (Latin) keyboard layout]]

South Slavic [[cyrillic]] keyboards use a different layout.

=== Switzerland ===
On [https://kbdlayout.info/KBDSG/10.0.17134.1/Overview+virtualkeys Swiss keyboards], AltGr in combination with the following keys types the following characters:
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{{Col-break|width=20%}}
* {{keypress|AltGr|1}} → <big>¦</big>
* {{keypress|AltGr|2}} → <big>@</big>
* {{keypress|AltGr|3}} → <big>#</big>
* {{keypress|AltGr|4}} → <big>°</big>
{{Col-break|width=20%}}
* {{keypress|AltGr|5}} → <big>§</big>
* {{keypress|AltGr|6}} → <big>¬</big>
* {{keypress|AltGr|7}} → <big>|</big>
* {{keypress|AltGr|8}} → <big>¢</big>
{{Col-break|width=20%}}
* {{keypress|AltGr|<}} → <big>\</big>
* {{keypress|AltGr|E}} → <big>€</big>
* {{keypress|AltGr|'}} → <span style="background-color: orange"><big>´</big></span>  ([[dead key]])
* {{keypress|AltGr|^}} → <span style="background-color: orange"><big>~</big></span>  ([[dead key]])
{{Col-break}}
* {{keypress|AltGr|Ü}} / {{keypress|AltGr|È}} → <big>[</big>  (See explanation below)
* {{keypress|AltGr|¨}} → <big>]</big>
* {{keypress|AltGr|Ä}} / {{keypress|AltGr|À}} → <big>{</big>  (See explanation below)
* {{keypress|AltGr|$}} → <big>}</big>
{{Col-end}}

[[Switzerland]] has four national Languages ([[German_language|German]], [[French language|French]], [[Italian_language|Italian]], and [[Romansh language|Romansh]]). The Swiss keyboard layout is therefore designed with compatibility in mind for all four languages. In [[German-speaking Switzerland|German-speaking]] and [[Romansh-speaking Switzerland]] (as well as the [[Czech Republic]]), the Swiss German layout is used, while in the French-speaking and Italian-speaking Switzerland, the Swiss French layout is used. The two layouts only differ on three keys—OEM1, [https://stackoverflow.com/a/582502 OEM5], and OEM7. On the Swiss German layout, these three keys are labelled {{keypress|<sup>è</sup>ü}}, {{keypress|<sup>é</sup>ö}}, and {{keypress|<sup>à</sup>ä}}, respectively, while on the Swiss French layout, the labels are inverted as  {{keypress|<sup>ü</sup>è}}, {{keypress|<sup>ö</sup>é}}, and {{keypress|<sup>ä</sup>à}}; namely, the base layer and the {{keypress|Shift⇧}} layer are swapped. However, with respect to the {{keypress|AltGr}} layer, the region-specific layouts are irrelevant.

Swiss German: {{keypress|AltGr|Ä}} → {

Swiss French: {{keypress|AltGr|À}} → {

=== Turkey ===
In Turkish keyboard variants the AltGr can be used to display the following characters:

{{Col-begin}}
* {{keypress|AltGr|a}} → <big>æ</big>
* {{keypress|AltGr|s}} → <big>ß</big>
* {{keypress|AltGr|e}} → <big>€</big>
* {{keypress|AltGr|t}} → <big>[[₺]]</big>
* {{keypress|AltGr|q}} → <big>@</big>
* {{keypress|AltGr|ı}} → <big>i</big>
* {{keypress|AltGr|ü}} a → <big>ã</big>
* {{keypress|AltGr|ğ}} a → <big>ä</big>
* {{keypress|AltGr|ş}} a → <big>á</big>
* {{keypress|AltGr|,}} a → <big>à</big>
{{Col-end}}

=== Ukraine ===
In Ukrainian (enhanced) keyboard, added in [[Windows Vista]], combination {{keypress|AltGr|U}} (or as it is written in Cyrillic keyboards {{keypress|AltGr|Г}} gives letter <big>ґ</big> and <big>Ґ</big>.

=== United Kingdom and Ireland ===
{{broader|QWERTY#United Kingdom|QWERTY#Irish}}
[[File:KB United Kingdom.svg|600px|United Kingdom keyboard layout]]

{{Col-begin}}
{{Col-break|width=25%}}
* {{keypress|AltGr|A}} → <big>á and Á</big>
* {{keypress|AltGr|E}} → <big>é and É</big>
* {{keypress|AltGr|I}} → <big>í and Í</big>
* {{keypress|AltGr|O}} → <big>ó and Ó</big>
* {{keypress|AltGr|U}} → <big>ú and Ú</big>
{{Col-break}}
* {{keypress|AltGr|4}} → <big>€</big>
* {{keypress|AltGr|#}} → <big>\</big>
* {{keypress|AltGr|`/¬}} → <big>¦</big>
{{Col-end}}

In [[Keyboard layout#United Kingdom|UK]] and [[Keyboard layout#Irish|Ireland]] keyboard layouts, only two alternative use symbols are printed on most keyboards, which require the AltGr key to function. These are:
* '''€''' the [[euro sign]]. Located on the "4/$" key.
* '''¦''' the [[broken bar]] symbol.  Located on the "`/¬" key, to the immediate left of "1".

Using the AltGr key on [[Linux]] produces many other characters and  symbols, e.g. {{not a typo|¹²³€½{[]}@łe¶ŧ←↓→øþæßðđŋħjĸł«»¢“”nµΩŁE®Ŧ¥↑ıØÞÆ§ÐªŊĦJ&Ł<>©‘’Nº×÷·}} (If reconfigured as a [[compose key]], an even larger repertoire is available). 

With the UK extended keyboard setting ([[#UK extended keyboard layout|below]]), [[ChromeOS]] offers a [[QWERTY#Chrome OS|large repertoire]] of symbols and [[precomposed character]]s.

====Scotland and Wales====
For the diacritics used by [[Welsh (language)|Welsh]] (ŵ and ŷ) and [[Scottish Gaelic]] (à, è, ì, ò and ù), the UK extended keyboard setting is needed. This makes available {{keypress|AltGr|6}} (for circumflex accent) and {{keypress|AltGr|`}} (for grave accent) as dead keys.

====UK extended keyboard layout====
The [[QWERTY#United Kingdom (Extended) Layout|UK-Extended keyboard mapping]] (available with Microsoft Windows, Linux and ChromeOS) allows many characters with [[diacritical mark]]s (including those used in other European countries) to be generated by using the AltGr key, [[dead key]]s or a [[compose key]], in combination with others.

{| class="wikitable" style="text-align:center;"
|+ UK extended layout under ChromeOS
| ¬ {{green|◌}}<br>{{red|◌}} {{green|¦}}||! {{green|¡}}<br>1 {{green|¹}}||" {{green|½}}<br>2 {{green|◌}}||£ {{green|⅓}}<br>3 {{green|³}}||$ {{green|¼}}<br>4 {{green|€}}||% {{green|⅜}}<br>5 {{green|½}}||^ {{green|⅝}}<br>6 {{green|◌}}||& {{green|⅞}}<br>7 {{green|{}}||* {{green|™}}<br>8 {{green|[}}||( {{green|±}}<br>9 {{green|]}}||) {{green|°}}<br>0 {{green|}}<nowiki>}</nowiki>||_ {{green|¿}}<br>- {{green|\}}||+ {{green|◌}}<br>= {{green|◌}}
|-
|tab||Q {{green|Ω}}<br>q {{green|@}}||W {{green|Ẃ}}<br>w {{green|ẃ}}||E {{green|É}}<br>e {{green|é}}||R {{green|®}}<br>r {{green|¶}}||T {{green|Ŧ}}<br>t {{green|ŧ}}||Y {{green|Ý}}<br>y {{green|ý}}||U {{green|Ú}}<br>u {{green|ú}}||I {{green|Í}}<br>i {{green|í}}||O {{green|Ó}}<br>o {{green|ó}}||P {{green|Þ}}<br>p {{green|þ}}||{ {{green|◌}}<br>[ {{green|◌}}||} {{green|◌}}<br>] {{green|◌}}
|-
|◉||A {{green|Á}}<br>a {{green|á}}||S {{green|§}}<br>s {{green|ß}}||D {{green|Ð}}<br>d {{green|ð}}||F {{green|ª}}<br>f {{green|đ}}||G {{green|Ŋ}}<br>g {{green|ŋ}}||H {{green|Ħ}}<br>h {{green|ħ}}||J {{green|◌}}<br>j {{green|◌}}||K {{green|&}}<br>k {{green|ĸ}}||L {{green|Ł}}<br>l {{green|ł}}||: {{green|◌}}<br>; {{green|◌}}||@ {{green|◌}}<br>' {{green|◌}}||~ {{green|◌}}<br># {{green|◌}}
|-
|shift||<nowiki>|</nowiki> {{green|¦}}<br>\ {{green|<nowiki>|</nowiki>}}||Z {{green|<}}<br>z {{green|«}}||X {{green|>}}<br>x {{green|»}}||C {{green|Ç}}<br>c {{green|ç}}||V {{green|‘}}<br>v {{green|“}}||B {{green|’}}<br>b {{green|”}}||N {{green|N}}<br>n {{green|n}}||M {{green|º}}<br>m {{green|{{not a typo|µ}}}}||<nowiki><</nowiki> {{green|×}}<br>, {{green|─}}||<nowiki>></nowiki> {{green|÷}}<br>. {{green|·}}||? {{green|◌}}<br>/ {{green|◌}}||
|} 
Notes: Dotted circle (◌) is used here to indicate a dead key, invoked using AltGr. The {{keypress|`}} ([[grave accent]]) key is the only one that acts as a free-standing dead key and thus does not respond as shown on the key-cap. (For a complete list of the characters generated using dead keys, see [[QWERTY#Chrome OS|QWERTY#ChromeOS]].) <br />
{{keypress|AltGr|shift|0}} (°) is a [[degree sign]];  {{keypress|AltGr|shift|M}} (º) is a masculine [[ordinal indicator]]. {{keypress|AltGr|,}} is an [[em-dash]]; there is no provision for [[en-dash]].

=== United States ===
Most keyboards sold in the US do not have an (engraved) {{keypress|AltGr}} key. However, if there is a right-hand {{keypress|Alt}} key it will act as {{keypress|AltGr}} if a layout using it is installed (conversely a foreign keyboard {{keypress|AltGr}} will act like the right-hand {{keypress|Alt}} if the standard US keyboard layout is installed).

====US-International====
{{Broader|QWERTY#US-International}}
Microsoft provides a [[US-International|US-International keyboard layout]] that uses {{keypress|AltGr}} (or right-hand {{keypress|Alt}} or {{keypress|Ctrl|Alt}}) key to produce more characters:
:[[File:KB US-International.svg|600px|US-International keyboard layout]]
Red characters are [[dead key]]s; for example '''ä''' can be entered with {{keypress|"|a|chain=}}.

Other operating systems such as [[Linux]] and [[ChromeOS]] follow this layout but increase the repertoire of [[glyph]]s provided.

== X Window System ==
In the [[X Window System]] (Linux, BSD, Unix), AltGr can often be used to produce additional characters with almost every key on the keyboard. 
Furthermore, with some keys, AltGr will produce a [[dead key]]; for example on a [[Keyboard layout#UK|UK keyboard]], [[semicolon]] can be used to add an [[acute accent]] to a base letter, and left [[square bracket]] can be used to add a [[trema (diacritic)|trema]]:
* {{keypress|AltGr|<nowiki>;</nowiki>}} followed by {{keypress|E}} → <big>é</big>
* {{keypress|AltGr|<nowiki>[</nowiki>}} followed by {{keypress|Shift|O}} → <big>Ö</big>

This use of dead keys enables one to type a wide variety of [[precomposed character]]s that combine various diacritics with either uppercase or lowercase letters, achieving a similar effect to the [[Compose key]].

===Keyboard maps===

Below are some diagrams and examples of country-specific key maps. For the diagrams, the grey symbols are the standard characters, yellow is with {{keypress|shift}}, red is with {{keypress|AltGr}}, and blue is with {{keypress|Shift|AltGr}}.

====Danish keyboard====

The Danish keymap features the following key combinations:
* {{keypress|AltGr|Shift|Q}} → <big>Ω</big>
* {{keypress|AltGr|O}} → <big>œ</big>
* {{keypress|AltGr|M}} → <big>{{not a typo|µ}}</big>

====Italian keyboard====
The Italian keymap includes, among other combinations, the following:
{{Col-begin}}
{{Col-break|width=25%}}
* {{keypress|AltGr|H}} → <big>ħ</big>
* {{keypress|AltGr|ì}} → <big>~</big>
{{Col-break}}
* {{keypress|AltGr|'}} → <big>`</big>
* {{keypress|AltGr|<nowiki>;</nowiki>}} → <big>×</big>
{{Col-end}}

==== Norwegian keyboard ====
[[File:Norwegian X Window key map with its AltGr combinations.png|450px|thumb|center|The complete Norwegian X Window key map with its AltGr combinations]]

==== Polish keyboard ====
The Polish keymap on X-based systems features changed combination for € sign:
* {{keypress|AltGr|5}} → <big>€</big>
{{keypress|AltGr|U}} results in ↓ instead.
It also introduces several symbols and characters from different languages, including among others:
* {{keypress|AltGr|T}} → <big>ß</big>
* {{keypress|AltGr|P}} → <big>þ</big>
* {{keypress|AltGr|D}} → <big>ð</big>
* {{keypress|AltGr|Q}} → <big>π</big>
* {{keypress|AltGr|Shift|Q}} → <big>Ω</big>
* {{keypress|AltGr|M}} → <big>{{not a typo|µ}}</big>
* {{keypress|AltGr|Shift|M}} → <big>∞</big>
* {{keypress|AltGr|F}} → <big>æ</big>
* {{keypress|AltGr|W}} → <big>œ</big>

==== Swedish keyboard ====
[[File:KB Sweden AltGr.svg|thumb|450px|center|The complete Swedish X Window key map with its AltGr combinations]]

== See also ==
* [[Modifier key]]
* [[Option key]]
* [[Shift key]]
* [[Dead key]]
* [[Escape character]]
* [[Compose key]]
* [[Windows Alt keycodes]]
* [[Precomposed character]]

==Notes==
{{notelist}}

== References ==
{{Reflist|refs=
* <ref name="IBM-1">{{cite web|url=http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixkybd/kybdtech/Appendix.htm|title=Keyboard Technical Reference|work=ibm.com|access-date=4 June 2005|archive-url=https://web.archive.org/web/20060114072048/http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixkybd/kybdtech/Appendix.htm|archive-date=14 January 2006|url-status=dead}}</ref>
* <ref name="IBM-2">{{cite web|url=http://www-01.ibm.com/software/globalization/topics/keyboards/alternate.html|title=IBM Globalization – Alternate graphic|work=ibm.com}}</ref>
* <ref name="Kaplan">Kaplan, Michael S.: [http://www.siao2.com/2004/12/28/333168.aspx "To start press the ALTGR key." Hmm... where's the ALTGR key?]. 28 December 2004.</ref>
* <ref name="Kotoistus">Kotoistus: [http://www.csc.fi/sivut/kotoistus/nappaimisto.htm Uusi näppäinasettelu = Status of the new Keyboard Layout] {{webarchive|url=https://web.archive.org/web/20110727024039/http://www.csc.fi/sivut/kotoistus/nappaimisto.htm |date=27 July 2011 }}. A bi-lingual (Finnish + English) presentation page collecting drafts of the Finnish Multilingual Keyboard. [[CSC&nbsp;– IT Center for Science Ltd]]. Page updated 28 December 2006.</ref>
* <ref name="SFS">[https://archive.today/20120715114449/http://sales.sfs.fi/servlets/ProductServlet?action=showproduct&productid=210467 SFS 5966] Keyboard layout. Finnish-Swedish multilingual keyboard setting. Finnish Standards Association SFS. 3 November 2008.</ref>

}}

{{Keyboard}}
{{keyboard keys}}

[[Category:Computer keys]]