ANSI and ISO describe physical keyboard-layout standards. They affect the shape and position of several keys, which means a set made for one layout may not contain the caps required by the other.
The Enter key
ANSI keyboards usually have a wide, horizontal Enter key. ISO keyboards commonly use a taller, two-row Enter key. This is the easiest difference to spot in a product photo.
The left Shift key
ANSI layouts typically use a longer left Shift. ISO layouts use a shorter left Shift because an extra key sits beside it. A keycap set needs both the correct Enter shape and the correct left-Shift size to support ISO.
Legends and regional layouts
Physical ISO support does not automatically provide every regional legend set. UK, German, Nordic, and other layouts may share the ISO Enter shape while using different printed characters.
What to verify before buying
- Does the included-key image show an ISO-style Enter?
- Is the shorter ISO left Shift included?
- Are the legends appropriate for the language layout you use?
- Do the bottom-row and spacebar sizes match?
Do not treat a seller’s percentage claim as proof of ANSI or ISO support. For the Strawberry Cat set, ISO support remains unverified, so the safe choice is to compare the complete included-key image and avoid assuming ISO compatibility. Start with our compatibility checker.