Different keyboard layouts explained
QWERTY, QWERTZ, AZERTY, ANSI & ISO

Updated 25.02.25
The layout of a keyboard refers to the physical organization of the keys. There are many different layouts all over the world, and they vary depending on the location(country), language, and keyboard manufacturer. The most widely recognized keyboard layout is referred to as QWERTY, named after the first six letters on the top row of keys.

ISO qwerty layout


The QWERTY layout was introduced for the first time in a mechanical typewriter in 1874. But it was with the successful Remington No.2 typewriter in 1878, that the layout gained widespread popularity.

The Qwerty layout was originally designed to minimize the jamming of mechanical typewriter arms during rapid typing. The intention was to position frequently consecutive letters on opposite sides of the keyboard to enable as much alternation as possible between the right and left hands while typing.

The most frequently used letters were positioned for easy access by the fingers, whereas the less common letters were situated in more challenging locations, like the positions of the letters Q and Z. 
The risk of jammed arms was higher if two metal arms lying next to each other got struck against the paper at (nearly) the same time. 
Because of this, the layout was designed so that letters in the same vertical row are seldom used sequentially in words. WSX is a prime example of this, as are RFV and TGB.

Drekiskip custom mechanical keyboard with GMK Dolch keycaps ISO Nordic
Drekiskip, with QWERTY ISO Layout.

Other common layouts, based on QWERTY, include QWERTZ (used in many German-speaking countries) and AZERTY (used in French-speaking countries). These layouts are nearly identical, with only letters Z and Y swapped (for QWERTZ) and letter A and Q swapped (for AZERTY).

DVORAK is another layout that was developed in 1936 to be even more efficient than QWERTY. However, when Dvorak was released, the Qwerty layout had already gained a foothold that was hard to overcome. It was also debated that the alleged advatages of Dvorak compared to Qwerty were relatively small, if existent at all.

The control and modifier keys on a keyboard originate from different eras. Before the age of computers, control keys served basic writing needs. Keys like [Shift], [Caps Lock], [Enter], [Space], and [Tab] were present on typewriters by the late 1800s. The advent of computers led to the need for navigation keys like [Home] and [End], along with additional modifier keys such as [Control] and [Alt]. While some keys, like [Scroll Lock] and [Pause], have become less useful in recent years, they remain on most QWERTY keyboards.

commodore 64 inspired keycaps

ANSI and ISO

Not only are there several variants of the QWERTY layout, such as QWERTZ and AZERTY, but there are also different standards that dictate specific layouts according to the language or geographical region. The most significant difference is between the ANSI and ISO standards.

ANSI
ANSI is short for American National Standards Institute and represents the most prevalent keyboard layout in North America, Australia and the Netherlands. It utilizes the QWERTY design but features differently sized [Enter] and [Shift] keys compared to ISO. Additionally, ANSI includes a large dedicated key for the backslash.

ANSI layout

ANSI layout, as used in the US.

ISO
ISO stands for the International Organization for Standardization. The ISO keyboard layout, also rooted in QWERTY, is predominantly used in Europe, South America and Asia. It differs from the ANSI layout, featuring a differently sized [Enter] key and a smaller left [Shift] key. Additionally, a full ISO keyboard has one more key than its ANSI counterpart, totaling 105 versus 104 keys. Apart from this, there is no difference between ISO and ANSI.

ISO layout
ISO layout, as used in United Kingdom (UK).

Drekiskip custom mechanical keyboard with brass weight
Our mechanical keyboard, Drekiskip in a 75% ISO layout.

Different language variants of the ISO layout

To accommodate the diverse requirements for letters and characters across languages, each region, country, or language typically has its own keyboard layout. As a result, variants like ISO Nordic, ISO UK, and others have been developed. While these layouts have similarly sized keys (as indicated by ISO), the placement of characters is tailored to meet specific needs. 

Comparing the English layout (ISO UK) with the Nordic layout, we notice that the inclusion of special letters such as Æ, Ø, and Å necessitates a different arrangement for characters like brackets, colons, and symbols like the @-sign and tilde.

Nordic ISO layout
ISO Nordic (Norway/Denmark) layout.

What is a 60% or a 75% keyboard?

A full-sized keyboard with an ISO layout typically has 105 keys and is considered 100% because it includes all the keys of a standard ISO layout. However, not everyone have the need for all 105 keys. Thus, there are scaled-down keyboard versions with the same layout but fewer keys. These versions are identified by the percentage of keys they contain relative to a full-sized keyboard. For instance, a keyboard with 62 keys would have 59% of the keys of a full-size keyboard, which is rounded up and designated as a 60% keyboard. An ISO layout with 83 keys constitutes 79% of a full-sized keyboard, which is then rounded to either 75% or 80%.

100% keyboard layout
100% layout with 105 keys.

60% keyboard layout60% layout with 62 keys.

What is a TKL keyboard?

The term "tenkeyless" (TKL) indicates the number of keys on a keyboard. "Ten-key-less" signifies the absence of the numpad on the right side. Indeed, if one also omits the [Enter], [Num Lock], and symbol keys, 17 keys are actually missing. However, in keyboard terminology, TKL means the numpad is omitted, leaving the keyboard with 88 keys, which is about 83% of a full-size keyboard. This is often approximated to 80%.
WKL is another acronym, standing for "Winkeyless," meaning "without the Windows key." Typically, both the Windows key and the menu/function key are omitted from the keyboard's bottom row.

high-end custom mechanical keyboard


Incomplete article? Do you have comments on the content? We appreciate your feedback.