Keybind Checker

What is this tool?

The Keybind Checker takes a layout you have built on a visual keyboard and reports specific, named problems with it: two actions on the same key, a critical action you never bound, a held combination one finger physically cannot make.

It deliberately does not give you a score out of ten. The page has a section titled Why there is no ergonomics score — the reasoning is that a single number hides which rule you broke, and the rule is the useful part.

Reach is judged against two hand models rather than a generic typing posture. The anchored model (FPS and MMO) assumes the palm heel is planted with fingers on WASD. The hover model (MOBA and ARPG) assumes the wrist floats so fingers can translate across QWER and the number row.

How to use it

1. Pick a profileFPS, MMO, MOBA or ARPG. The profile chooses the hand model and the action list — FPS expects Jump, Sprint, Crouch and Reload within reach of an anchored hand; MMO expects high bind density across the number row with pinky modifiers.
2. Bind your actionsClick a key and assign an action. Actions not in the template can be added as custom entries, so a game the templates do not cover still works.
3. Set the Held and Critical togglesMark an action Held if you hold it down — Sprint, Aim, Move Forward. Mark it Critical if it is reaction-sensitive — Flash, Interrupt, Health Potion. These two flags drive the entire analysis.
4. Read the findings and iterateEach finding names the actions and the keys involved. Rebind and the analysis updates. Copy link encodes the whole layout into a URL so you can share or save it.

What the results mean

Duplicate Bind Conflict

Two actions are on the same key. In most games the later bind silently wins, so one of the two will never fire.

Impossible Held Combination

Two actions you marked as Held sit on keys the same finger operates. One finger cannot hold two separate keys, so this is a physical impossibility rather than a matter of taste — which is why it is flagged as critical.

Critical Action in Stretch Zone

An action you marked Critical is on a key your hand has to stretch for. Reaction-sensitive actions in the stretch or far zones cost you time exactly when you have none.

Not bound

A profile action has no key at all. For a Critical action that is flagged prominently, because it is the failure you will only discover mid-fight.

Mouse Hand Keyboard Reach

A bind that your mouse hand would have to leave the mouse to press. Sometimes that is fine; the tool names it and lets you decide.

Limits worth knowing

A browser can only report what the platform gives it. These are the honest boundaries of this page, so a result is never read as more than it is.

• The page has its own section called “Honest limits” and it is worth reading. Browsers cannot capture Ctrl+W, Ctrl+T or Ctrl+N — tab management claims them — nor Alt+Tab, Alt+F4 or the Windows key, which the operating system intercepts. To analyse a bind that uses those, toggle the modifier buttons and pick the keycap instead of pressing the combination.
• The checker does not know which keyboard you own. Reach is evaluated against a hand model and a standard layout, not against your actual board's dimensions.
• It does not test whether two keys register together electrically. That is rollover, and the Anti-Ghosting Test is the tool for it.
• There is no score by design. The findings are deterministic rules, and a rule you disagree with is one you are free to overrule.

Tips

• Set the Held flags honestly. They are what turn a same-finger clash into an impossible-combination finding, and an unmarked held action will pass silently.
• Keep Critical actions in the home zone even when it means moving something you have used for years. Habit is not the same as reachable.
• Use Copy link to save a layout before you experiment — nothing is stored on a server, so the URL is your only copy.

Troubleshooting

Related documentation

• KeyboardCS2 Bind GeneratorBuild binds on a visual keyboard and export a clean autoexec.cfg that stays inside Valve's rules.
• KeyboardAnti-Ghosting TestChecks whether simultaneous key presses all arrive, and how many your board can hold at once.
• KeyboardOnline Keyboard TestThe keyboard tester on the home page — press keys, watch them light up.
• KeyboardKey Event TesterA live inspector for event.key, event.code, location, repeat and modifier state — built for developers.
• KeyboardKeyboard Double-Click TestApplies a millisecond threshold to press-to-press timing and calls out chatter.