QMK Tester

Test QMK keycodes and modifiers with an interactive online simulator.

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About This Tool

The QMK Tester is a fully functional online tool that allows you to test QMK keycodes, modifier combinations, and layer selections. Input any QMK keycode (e.g., KC_A, KC_ENT, MO(1)), toggle modifiers like Shift, Ctrl, Alt, and GUI, select layers, and simulate key presses to see the exact output. This tool is ideal for keyboard firmware developers, mechanical keyboard enthusiasts, and anyone working with QMK or VIA configurations to verify key mappings before flashing firmware.

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How to Use

Enter a QMK keycode in the input field (e.g., KC_A for 'A', KC_ENT for Enter, MO(
for momentary layer
.
Toggle modifier keys (Shift, Ctrl, Alt, GUI) as needed using the checkboxes.
Select a layer from the dropdown menu (0-
to simulate layer-specific keycodes.
Click the 'Test Key Press' button to simulate the key press.
View the results in the output section, showing the keycode, modifiers, layer, and simulated output.

Frequently Asked Questions

Find Quick Answers

What is QMK?

QMK (Quantum Mechanical Keyboard) is an open-source keyboard firmware that allows extensive customization of key mappings, layers, and macros for mechanical keyboards.

What keycodes can I test?

You can test basic keycodes (e.g., KC_A, KC_1), modifiers (e.g., KC_LSFT), layer keys (e.g., MO(1), TG(2)), and special keys (e.g., KC_ENT, KC_SPC). The tool parses these using a comprehensive dataset.

Does this tool require an internet connection?

Yes, the tool runs entirely in your browser using JavaScript, so an internet connection is needed to load the page, but no data is sent to a server.

Can I test multiple key presses at once?

No, this tool simulates a single key press at a time, including any active modifiers and layer. For complex macros, you would need to test each step separately.

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