Hardware & Standards
6 min readKeyboard Layout Guide: ANSI vs ISO, US vs UK Differences
Everything you need to know about physical key shapes, swapped symbols, and keyboard standards
Executive Summary
If typing the @ key produces quotes (") or your Enter key looks shaped like a reverse L, you are experiencing the difference between US ANSI and International ISO keyboard standards.
ANSI vs ISO: Physical Key Differences
There are two primary physical mechanical standards used across English-speaking countries:
1. ANSI (American National Standards Institute):
- Used predominantly in the United States, Canada, and Australia.
- Wide, horizontal rectangular Enter key (1 row tall).
- Wide Left Shift key.
- 104 keys standard on desktop.
2. ISO (International Organization for Standardization):
- Used predominantly in the United Kingdom, Ireland, and across Europe.
- Tall, inverted L-shaped Enter key (2 rows tall).
- Short Left Shift key with an extra key between Shift and Z (usually backslash \ or pipe |).
- 105 keys standard on desktop.
Swapped Symbols Between US and UK Layouts
The most common source of confusion when switching between laptops or regions is swapped symbols:
| Key Combo | US Layout Output | UK Layout Output | Why the Difference? |
|---|---|---|---|
| Shift + 2 | @ (At Sign) | " (Double Quote) | UK places double quotes above 2 |
| Shift + ' | " (Double Quote) | @ (At Sign) | UK places at sign next to Enter |
| Shift + 3 | # (Hash / Number) | £ (British Pound) | UK dedicates Shift+3 to its native currency |
| AltGr + 4 | None | € (Euro Sign) | UK keyboard provides easy access to Euro |
| Tilde key (~) | ~ and ` | ¬ (Not Sign) and ¦ (Broken Bar) | UK uses logic symbols on top left key |
How to Fix Swapped Keys in Windows and Mac Settings
If your typed characters do not match your physical keys:
- On Windows 10/11: Go to Settings > Time & Language > Language & region. Under Preferred Languages, check whether your keyboard input is set to 'English (United States)' or 'English (United Kingdom)'. Change it to match your physical keyboard.
- On macOS: Go to System Settings > Keyboard > Text Input > Edit. Ensure your input source matches your physical layout.
Frequently Asked Questions
Can I use a US ANSI keyboard in the UK or Australia?
Yes, ANSI keyboards work everywhere. Simply set your operating system's input language to US English, and every symbol will type exactly as printed on the keys.
What is the AltGr key on UK and European keyboards?
AltGr stands for 'Alternate Graphic'. It acts as a dedicated third-level shift key, allowing you to type symbols like € (AltGr + 4) or accents without extra key combinations.