ANSI vs. ISO: Differences, pros and cons of keyboard layouts explained

Anyone looking to buy a new mechanical keyboard will sooner or later come across the terms ANSI and ISO. Especially with international manufacturers and custom keyboards, the selection is often vast. But what does this actually mean? And why do some keyboards look different even though they have the same number of keys?

The difference between ANSI and ISO lies primarily in the physical arrangement of individual keys. This affects not only the Enter key, but also the left Shift key and the position of some special characters. Which layout suits you better therefore depends heavily on how you use your keyboard and what you are accustomed to.

ISO vs. ANSI: What is the difference?

ANSI and ISO are two different standards for the arrangement of keyboard keys. ANSI stands for American National Standards Institute and is primarily common in the USA. ISO stands for International Organization for Standardization. The ISO layout, on the other hand, is used in many European countries, including Germany.

The most noticeable difference between ANSI and ISO is the Enter key. On an ANSI keyboard, it is wide and arranged horizontally. On an ISO keyboard, by contrast, it is taller and L-shaped. However, that is just the beginning.

The left Shift key also differs: on ANSI it is longer, while on ISO it is shorter. In return, the ISO layout features an additional key located to the left of the Y key (or to the left of the Z key in QWERTY).

This has little to do with the language of the keyboard initially. QWERTZ or QWERTY describes the letter arrangement, while ANSI and ISO describe the physical design. In practice, however, both things are closely linked, as German keyboards are almost always ISO, and American ones are almost always ANSI.

ISO keyboard: Structure and typical features

You can recognize an ISO keyboard immediately by its Enter key. It is tall and spans two rows, similar to an inverted L. On German models, the hash key is located right next to it.

There are also other differences:

• The left Shift key is shorter because there is an additional key located to the left of it (usually for the <, >, and | characters).

• To the right of the space bar, there is an AltGr key instead of a second Alt key.

• In total, a standard-sized ISO keyboard has 105 keys.

Using AltGr, you can access characters like @, €, or curly brackets. Umlauts and the ß have their own keys and can be typed without detours.

ANSI keyboard: Structure and typical features

On an ANSI keyboard, the Enter key is flat and wide; it occupies only one row. In return, the backslash (\) is located directly above the Enter key. The left Shift key is long, and to the right of the space bar, there is a standard Alt key.

In total, the ANSI keyboard has 104 keys. It therefore lacks one key compared to the ISO layout. While that may not sound particularly relevant, it changes the entire layout in the left and right border areas.

ISO vs. ANSI keyboard in direct comparison

However, it also depends on which operating system and language layout are set. The physical arrangement alone does not determine which character appears when a key is pressed.

ISO keyboard: Advantages and disadvantages

For German users, the ISO keyboard is usually the more familiar choice. Those who write in German will find all special characters exactly where they are used to. Umlauts, ß, and the Euro sign are accessible without extra effort. For frequent writers, office work, and studies, this is significantly more comfortable.

The large Enter key also has its fans. It is easy to hit with the little finger without needing to aim precisely.

The disadvantage becomes apparent mainly with individual keyboards. Many custom keycap sets and cases are designed for ANSI. Anyone wanting to customize an ISO keyboard has to search more specifically, and the selection is smaller. Additionally, some gamers find the shorter left Shift key impractical because they hit it incorrectly more often.

ANSI keyboard: Advantages and disadvantages

The ANSI keyboard scores points with its wide distribution in the international market. Gaming keyboards, custom boards, and keycap sets are almost always released in the ANSI format first; sometimes they are only available that way. Those who enjoy tinkering and swapping keycaps have much more freedom here.

The long left Shift key is an advantage in gaming, as it sits generously under the finger. And because the layout looks tidier, many users like the clean, symmetrical appearance.

On the other hand, there is the umlaut question. An ANSI keyboard has no keys for ä, ö, ü, and ß. Those who write a lot in German therefore need detours, such as the US-International layout in the system settings or keyboard combinations. This works, but it takes getting used to. Furthermore, the AltGr key is missing, which makes accessing some characters more difficult.

ANSI vs. ISO keyboard in gaming: Does the layout make a difference?

When it comes to gaming, the question of whether ANSI or ISO is the better choice also often arises. In fact, there is no fundamental technical advantage here. Both layouts work just as well for gaming, as long as the key mapping matches the respective application.

The difference becomes relevant mainly regarding the position of individual keys. Anyone used to specific movement sequences or who regularly switches between different keyboards should ensure that the layout matches their own habits.

For custom gaming keyboards, ANSI can also be interesting due to the larger selection of models and keycaps. However, anyone used to a German ISO keyboard does not need to switch just for the sake of gaming.

ANSI or ISO: Which layout suits you?

The decision depends less on the technology than on your habits.

An ISO keyboard is the better choice if you write a lot in German daily and don't want to deal with detours for special characters. It is also the safer option if you are looking for a keyboard without a lot of tinkering anyway.

You should choose an ANSI keyboard if selection and customizability are more important to you. This applies to gamers who can only find a specific gaming keyboard in this format, and to enthusiasts who like to install their own keycap sets. If you only occasionally need umlauts, you will get along well with a clean software solution.

When switching, it's worth taking a look at the keycaps. An ISO board with ANSI keycaps won't fit because the Enter, Shift, and the additional key require different shapes. So, if you switch, you should choose a board and caps that match each other.

FAQs: Frequently asked questions about ANSI vs. ISO

What does ANSI mean for keyboards?

ANSI stands for American National Standards Institute and refers to a keyboard standard that is primarily common in the USA. It can be recognized, among other things, by the wide, horizontal Enter key and the long left Shift key.

What does ISO mean for keyboards?

ISO stands for International Organization for Standardization. The ISO layout is used in many European countries and differs from ANSI mainly through the L-shaped Enter key and an additional key to the left of the Y.

What is the difference between ANSI and ISO?

The main difference lies in the shape of individual keys. The ISO keyboard has a tall, two-row Enter key, a shorter left Shift key, and an AltGr key. The ANSI keyboard has a flat Enter key, a long left Shift key, and a standard Alt key.

Can I write in German on an ANSI keyboard?

Yes. You can also set the German keyboard layout on an ANSI keyboard. However, some characters will then be in different physical positions than on a classic German ISO keyboard.

Which keyboard is better for gaming, ANSI or ISO?

Both work. Many gamers prefer ANSI due to the long left Shift key and the larger model selection. You can play just as well on an ISO keyboard once you have gotten used to the layout.

Do ANSI keycaps fit on an ISO keyboard?

Only partially. The standard keys fit, but the Enter, left Shift, and additional ISO key require their own shapes. Therefore, when purchasing keycap sets, pay attention to the "ISO-compatible" specification.