ANSI vs ISO keyboards

ANSI has a wide horizontal Enter and longer left Shift. ISO has a tall Enter and an extra key beside a shorter left Shift. JIS adds Japanese input keys and a shorter spacebar.

First keyboard

US QWERTY · Typing block: 61 keys in the illustrated arrangement`, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, -, =, Backspace, Tab, q, w, e, r, t, y, u, i, o, p, [, ], \, Caps, a, s, d, f, g, h, j, k, l, ;, ', Enter, Shift, z, x, c, v, b, n, m, ,, ., /, Shift, Ctrl, Win, Alt, Space, Alt, Win, Menu, Ctrl``11223344556677889900--==BackspaceBackspaceTabTabqqwweerrttyyuuiioopp[[]]\\CapsCapsaassddffgghhjjkkll;;''EnterEnterShiftShiftzzxxccvvbbnnmm,,..//ShiftShiftCtrlCtrlWinWinAltAltSpaceSpaceAltAltWinWinMenuMenuCtrlCtrl
US QWERTY · Typing block: 61 keys in the illustrated arrangement.

Second keyboard

UK QWERTY · Typing block: 62 keys in the illustrated arrangement`, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, -, =, Backspace, Tab, q, w, e, r, t, y, u, i, o, p, [, ], Caps, a, s, d, f, g, h, j, k, l, ;, ', #, Enter, Shift, \, z, x, c, v, b, n, m, ,, ., /, Shift, Ctrl, Win, Alt, Space, Alt, Win, Menu, Ctrl``11223344556677889900--==BackspaceBackspaceTabTabqqwweerrttyyuuiioopp[[]]CapsCapsaassddffgghhjjkkll;;''##EnterEnterShiftShift\\zzxxccvvbbnnmm,,..//ShiftShiftCtrlCtrlWinWinAltAltSpaceSpaceAltAltWinWinMenuMenuCtrlCtrl
UK QWERTY · Typing block: 62 keys in the illustrated arrangement.
2 changed character positions61 keys vs 62 keys3 changed key shapes or positions

Dashed outlines mark different characters, key shapes or positions, and keys present on only one keyboard. Both diagrams use the same key-unit scale.

F1–F12First: On a layerSecond: On a layer
ArrowsFirst: On a layerSecond: On a layer
NavigationFirst: On a layerSecond: On a layer
NumpadFirst: On a layerSecond: On a layer

Check the actual keys in a keycap kit

Look for the Enter shape, left and right Shift widths, bottom-row modifiers and spacebar width. A kit that fits one full-size ANSI board may still lack the short right Shift or 1-unit modifiers used by a compact board.

Keycap support and keyboard switch-mount compatibility are separate checks. Match the key shapes and widths to your board before replacing caps.

Physical shape and typed language

ANSI and ISO describe physical positions. QWERTY, AZERTY and QWERTZ describe letter arrangements, while the selected input source determines the delivered characters. Changing the input language does not change the shape of Enter.

If a key produces a different character from its legend, compare the selected input source in the layout checker, then change the operating-system setting if needed.

Japanese JIS differences

JIS uses a tall Enter, a shorter right Shift and extra symbol positions. Its bottom row contains conversion/input-mode keys around a shorter spacebar. Japanese character entry also depends on the selected input method.