What Are QMK and VIA? Keyboard Firmware Explained
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QMK and VIA are names you will see attached to many enthusiast keyboards, and they refer to firmware and software that let you fully customize what your keys do. Firmware is the small program running on the keyboard itself that decides which signal each key sends. When a board supports this kind of programmability, you gain control over your layout that a typical keyboard simply does not offer.
QMK is a widely used open source keyboard firmware that gives deep control over key behavior. With it you can remap any key to any function, create multiple layers that change what the keys do when you hold a modifier, and set up advanced behaviors like keys that act differently when tapped versus held. It is powerful, and it is the backbone of customization on many custom boards.
VIA is a companion tool that makes much of that power accessible without editing code or reflashing the board. It provides a graphical interface where you click a key and assign it a new function, with changes taking effect immediately. For most people, VIA is the friendly front door to customization, turning what used to require technical steps into simple point and click edits.
Programmability matters most on smaller boards. On a 60 or 65 percent layout that lacks a function row or dedicated keys, layers let you place those missing functions onto a second layer so nothing is truly lost. You hold a layer key and the number row becomes function keys, or other keys become arrows, which is what makes compact boards genuinely usable rather than limiting.
When shopping, treat QMK or VIA support as a meaningful feature, especially if you are drawn to compact boards or want to tailor your layout precisely. Not every keyboard supports them, so check the product's compatibility before buying if programmability matters to you. For anyone who wants their keyboard to work exactly their way, this firmware is one of the most valuable capabilities a board can have.