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75% Keyboard Tester

Test all 83 keys on a 75% compact keyboard — function row kept, navigation folded into a right-hand column.

Simply press any key on your keyboard to test it — if it works it will turn green

0Keys Pressed0Total Keys0%Tested

QWERTY on the US ANSI shape: a wide flat Enter and a full-length left Shift. Standard key positions, with no vendor-specific extras.

Ctrl+W, Ctrl+T, Ctrl+N, Alt+Tab and the Windows or Command key are reserved by the browser and the operating system. No web page receives them, so they cannot be tested here or anywhere else in a browser.

At a glance

Key counts and layout facts
DetailValue
Common name75%, compact
Testable key count83 keys
Physical keys84 including Fn
Number padNo
Function rowYes — Esc and F1 to F12
Navigation keysFolded into a right-hand column
Keys on a Fn layerScroll Lock, Pause, Menu, media
Typical width320 to 330 mm

A 75% keyboard in numbers

Every figure describes the compact 75% board this page opens on.

83
Testable keys84 physical keys, of which Fn can never report.
1
Key that cannot be testedFn is handled inside the keyboard and sends nothing.
12
Function keys keptThe main reason to choose 75% over 65%.
325
Millimetres wideAbout 35 mm narrower than a tenkeyless board.

How to test a 75% keyboard

The crowded right edge deserves most of your attention.

  1. Function row first

    Esc through F12, then the extra keys your manufacturer placed at the end of that row — commonly Print Screen, Delete and Insert. Those three vary between makers more than any other part of the layout.

  2. Alphanumeric block

    Number row, letter rows, then the bottom row. The right Shift is shortened to make room for the up arrow, so press it deliberately at its centre.

  3. The right-hand column and arrows

    Work down the navigation column, then press all four arrows. Watch which cap lights rather than assuming the one under your finger is the one that fired — the keys are narrow and tightly packed here.

What to check on a 75% board

Five checks aimed at the compromises this layout makes.

Everything about this layout

The shape, the trade-offs and what to watch for when testing it.

What a 75% keyboard gives up

Compared with a tenkeyless board, a 75% loses the gaps. On a TKL the function row sits above an 8 mm break, the navigation cluster is a separate six-key island, and the arrows have clear space around them. On a 75% all of that is squeezed into one continuous slab about 20 mm narrower.

The navigation keys survive, but only some of them and only in a single column running down the right edge: typically Print Screen, Delete and Insert on the function row, then Page Up, Page Down, Home and End stacked down the side. The arrow keys tuck under the right Shift, which is shortened to make room.

Everything else — Scroll Lock, Pause, the Menu key, the right Windows key — moves onto the Fn layer or disappears entirely. That is the trade, and this test counts 83 keys because those are the 83 that physically exist.

The Fn key will never light up

Every 75% board has an Fn key, and it will stay greyed out on this test no matter how hard you press it. That is correct behaviour, not a fault.

Fn is handled by the microcontroller inside the keyboard. When you hold it, the controller changes what the other keys report — Fn plus F5 might send Print Screen — but Fn itself never becomes a key event and never reaches your browser. There is no way for any web page to see it.

For that reason Fn is drawn on the board with a dashed outline and excluded from the totals. A working 75% board therefore reaches 100% on 83 keys, with the 84th physical key sitting there permanently untestable.

Testing the crowded right edge

The right-hand column is where 75% boards go wrong, because the keys are narrow, tightly packed and easy to mis-hit. Press each one deliberately and watch which key on screen lights up, rather than assuming the one under your finger is the one that fired.

A neighbouring key lighting up consistently means the keycap is catching on its neighbour, or the switch is seated at an angle. On a hot-swap board, pull both caps and reseat them before assuming a switch has failed.

The arrow cluster under the right Shift deserves the same attention. On many 75% boards the up arrow sits directly beside a shortened right Shift, and a slightly wide Shift cap will physically block it.

Is 75% the right size for you?

If you use the function row for anything — debugging with F5 and F12, renaming with F2, alt-tabbing between quick-slots in games — a 75% keeps that and a 65% does not. That single difference is the whole reason the layout exists.

If you also need Home, End, Page Up and Page Down for editing text or code, a 75% keeps those as dedicated keys, though in a column rather than a block. A 65% keeps only some, and a 60% keeps none.

What you give up is spacing. A 75% board takes a few days to stop mis-hitting, because keys that used to have gaps around them now touch. Test yours here before deciding whether the misses are you or the board.

75% against its neighbours

The 75% layout sits between a tenkeyless board and a 65%.

Testable key count and features by layout
LayoutTestable keysFunction rowArrow keysNumber pad
Tenkeyless (TKL)87YesDedicated, spacedNo
75% compact83YesIntegratedNo
65% compact67NoIntegratedNo
60% mini60NoFn layerNo

The function row is the whole argument for 75% over 65%. Everything else the two layouts share.

Fixing a 75% keyboard

Three faults that come with a compressed layout.

The wrong key lights when I press one

On the test:A neighbouring cap turns green instead of the one you pressed.

  1. Press the key at its exact centre and check which cap lights.
  2. Remove both keycaps and check each is seated square on its stem.
  3. Look for a switch installed at an angle, which tilts the cap into its neighbour.
  4. Reseat and retest before concluding a switch has failed.
The up arrow does not respond

On the test:Left, down and right arrows light; up stays blank.

  1. Check the right Shift cap is not overhanging the up arrow.
  2. Press the up arrow at its front edge, away from the Shift key.
  3. Swap the up arrow switch with one from a key you never use, on a hot-swap board.
My board has keys the diagram does not

On the test:A key on your hardware has no counterpart on screen.

  1. Expect this. The right-hand column of a 75% is the least standardised part of any layout.
  2. Press the key and watch which on-screen cap lights — the code is what matters, not the position.
  3. Use the full size layout instead if your board carries navigation keys this one does not draw.

Frequently asked questions

How many keys does a 75% keyboard have?
84 physical keys on a typical ANSI 75% board, of which 83 can be reported by a browser. The 84th is Fn, which the keyboard handles internally and never sends. This test counts the 83 and excludes Fn, so 100% stays reachable.
Why will my Fn key not turn green?
Because no web page can see it. Fn is processed inside the keyboard's own controller to change what other keys send; it never becomes a browser key event. It is drawn with a dashed outline here for exactly that reason.
What is the difference between 75% and TKL?
A TKL keeps the full navigation cluster as a separate six-key island with gaps around everything. A 75% squeezes the same board about 20 mm narrower by folding navigation into one column and removing the gaps. Both keep the function row.
Do 75% keyboards have Home and End?
Usually yes, as dedicated keys in the right-hand column, though the exact arrangement varies by manufacturer more than on any other layout. Compare the board on screen with the one in front of you.
Can I use a 75% keyboard for gaming?
Yes, and it is a common choice. You keep the full function row for quick-slots and the dedicated arrows, while freeing roughly the width of a mouse pad. The main adjustment is the missing spacing around the arrow keys.

Every layout below opens with its own board ready to test.

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Test all 83 keys now

The board above is already set to a 75% layout, with Fn drawn and excluded. Press every key and watch the score reach 83.

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