Compact keyboards are a niche within the expensive but highly customizable world of mechanical keyboards. My modest collection of sub-60% keyboards often evokes a mix of curiosity and skepticism about practicality for everyday use. After dallying with an accouterment of tiny boards for a couple of years now, I seem to finally have the answer to this general skepticism. In my experience, these small keyboards are surprisingly efficient, much more so than their larger space-hogging counterparts.

I can already sense some readers racing for the comments section, so before I dive into the weeds about these splendid peripherals, let me dial it back to the basics. Full-size keyboards are what you'll find in most offices, commonly called 100% layouts, where each key has one or two functions, at most. Start stripping the number pads, function rows, and arrow keys away, and you'll be left with the 26 letters of the alphabet, and around 15 other keys like the Spacebar, Shift, Caps Lock, and other modifiers. These layouts with up to around 45 keys comprise the majority of 40% keyboards. For a growing number of computer users, the novelty of the 40% variety unlocks surprising gains in efficiency and comfort.

The allure of a 40% keyboard isn't just about aesthetics or desk space, though those are certainly perks. It’s about fundamentally rethinking how we interact with our most-used tool. By bringing every key in just the row above or below the home row where your fingers rest, these tiny powerhouses can transform your typing experience. If you've ever marveled at the efficiency of your smartphone's on-screen keyboard, imagine that same intuitive design, but supercharged for ten-finger typing. During this journey I embarked on, there were several key ideas I wished I’d grasped much earlier.

5 Efficient for Touch Typing

Minimal movement for maximum speed

One of the most significant, yet often overlooked, benefits of a 40% layout is its profound impact on touch typing. Conventional keyboards, with their staggered rows and sprawling keymaps, necessitate significant finger travel. Reaching for numbers, symbols, or frequently used keys like Backspace with the pinkie finger of your non-dominant hand can break your rhythm and tax your typing speed.

A 40% keyboard, by its very design, forces you to keep your fingers anchored on or very near the home row for touch typing. With a significantly reduced number of physical keys, every essential character is just in the row above, underneath, or below the one your fingers rest on. Abnormal movement of the lesser-used fingers, like your pinkie and thumbs, is also greatly reduced. However, the compromises and key layering are well-thought-out. How often do you actually need a dedicated Caps Lock key, or that distant tilde? Many of these keys are relegated to layers, accessible via a modifier key, much like pressing Shift for uppercase letters. This might sound like an extra step, but in practice, it quickly becomes second nature.

The result is a more fluid and efficient typing motion. Your fingers dance across a smaller, more concentrated area, reducing the physical and mental overhead of hunting for keys and risking mistypes. This streamlined approach boosts words-per-minute and contributes to a more comfortable experience that allows sustained speed, especially during long coding sessions or, in my case, writing sprints. It’s about making every keystroke count, and a 40% layout excels at this by keeping everything you need literally at your fingertips.

4 Great soldering practice

And more usable than a macropad

For those venturing into the world of custom mechanical keyboards, the prospect of hand-wiring and soldering a new keyboard can be daunting, even if it involves a pre-fabricated PCB. Internally, these keyboards present a complex matrix of switches, diodes, and wires, making a full-size DIY board a challenging first project. In stark contrast, most hobbyists suggest starting with a hand-wired macropad project, but I would argue that a compact 40% keyboard offers more utility if you're curious about layouts. Most of these niche, smaller keyboards are often offered as DIY kits with a gentler learning curve and an excellent platform for honing your soldering skills, much like a macropad.

Fewer keys inherently mean less soldering. You're dealing with a significantly smaller number of switch pins and diode legs to connect to your microcontroller. This reduction in complexity makes the entire process more manageable, less prone to errors, and ultimately, more rewarding for beginners. The satisfaction of building your own input device is immense, and a 40% board provides a quicker path to that dopamine rush when your creation first comes alive.

Another benefit beginners enjoy with the smaller footprint of a 40% keyboard is the simpler case design and plate manufacturing, whether you're 3D printing your own or sourcing components. Troubleshooting is also less of a headache; with fewer connections to check, identifying a cold solder joint or a miswired row becomes a much less formidable task. It’s an ideal training ground, allowing you to understand the fundamental principles of keyboard matrices and firmware without being overwhelmed by sheer scale.

3 Compactness is a mere byproduct

Space savings by accident

Smaller keyboards and their custom layouts often aren't worth the mental rewiring they demand for most users, and 60% is where most users draw the line. While going smaller has functional benefits, its diminutive size is the most immediately apparent advantage of a 40% keyboard. In an era of increasingly mobile work styles and cluttered desks, this compactness is a practical game-changer. For students, corporate staffers on a hybrid schedule, or anyone who frequently works in different locations, the portability of a 40% keyboard is a significant boon, even though it isn't the primary objective for most people who switch to using one.

Imagine slipping your primary input device into a laptop bag with ease, without the bulk and awkwardness of a traditional keyboard. A 40% board leaves more room for your mouse, notebook, and other peripherals. With limited desk real estate, more mouse space alone can help with ergonomic arm movement.

Beyond portability, the diminutive footprint contributes to a cleaner, more organized workspace. It encourages a more focused environment, free from the visual clutter of seldom-used keys. Compared to a conventional staggered mechanical keyboard, which can dominate a desk, a 40% keyboard feels refreshingly unobtrusive, allowing for greater flexibility in how you arrange your workspace for optimal productivity and comfort. Lest I forget, they are fantastic conversation starters with most people asking me "how do you even type on that?"

2 They aren't so different after all

Take a look at your smartphone's on-screen keyboard

Compact keyboards are great, and looking at one on a desk feels awkward the first few times, but it isn't an alien concept. Chances are, you type on a compact keyboard layout every single day — your smartphone’s on-screen keyboard. The Gboard layout has been honed for ease of use while optimizing for the limited screen width you see on popular smartphones. We are adept at tapping out messages with our thumbs, intuitively switching between alpha and symbol layers.

Now, imagine that same efficient, layer-based approach, but with customizable per-key actions in every layer, and the ability to use all ten fingers instead of just two thumbs. This is precisely what a 40% keyboard offers. The learning curve isn't as steep as many imagine because the core concept is already familiar. If you go down this road, you just translate a well-honed mobile typing skill to a more efficient physical device.

Looking at compact layouts this way allowed me to dispel the barriers that the complexity of the layers would slow my typing down and annihilate my accuracy. Moreover, you can also try other layout variations within compact keyboards, such as ortholinear keys, where each key is arranged in a linear grid so Q, A, and Z are directly above each other, instead of in a diagonal column. To reduce wrist cramping, you'll also find 40% boards split down the middle, or column-staggered to account for the variation in how long our fingers are. These are empowering changes in the world of custom mechanical keyboards, but I'd suggest attending local community meets where you can try such boards in person before you commit to the rather expensive alternative of building a keyboard to find out.

1 Don't underestimate the magic of layers

A board that's uniquely yours

Switching to anything smaller than a 60% gaming keyboard seemed impossible at first, but I entertained the idea for long enough while I read through the Quantum Mechanical Keyboard (QMK) firmware documentation. The sheer depth of firmware-level customization it offers makes swappable mechanical key switches and keycaps look like the cherry on top. You can remap every single key to your exact workflow, as mine demands easy access to the arrow keys and punctuation for writing.

Layered functions might not seem intuitive at first, but having numerals 1 through 0 under the QWERTY row, along with their shifted symbol maps, soon becomes second nature, like accessing uppercase letters while holding down the Shift key. On my keyboards, I've taken the liberty of mapping arrow keys to IJKL in addition to WASD, so I have the cluster under both hands. Accessing these layers doesn't always necessitate holding down a layer activator key — QMK offers conveniences like layer toggles and One Shot Mods. The latter allows you to tap and release the layer activator key to activate said layer for just one subsequent keypress.

Moreover, sub-40% layouts often trim away seemingly intricate keymap configurations. Unless you like spamming characters in group chats and online livestreams, QMK can help assign keys like Shift, Ctrl, GUI, and Alt to your home row. Home Row Mods (HRM) allow you to assign modifier functions to your home row keys when held, while they retain their standard character output when tapped. This drastically reduces finger contortion and keeps your hands centered, boosting both speed and ergonomics. There are several layouts possible for HRM, but I've found the one called Offset GACS works best for me — GUI, Alt, Ctrl, and Shift under Z, X, D, and F respectively, with the same mirrored on the other side under J, K, ., and /.

This level of personalization means your keyboard adapts to you, not the other way around. Lest I forget, one-tap macros can activate multi-modifier combinations, so you get a jump-start on using the repositioned modifier keys. Less finger travel means faster access to the functions you need, and it significantly reduces the physical strain associated with prolonged typing. Instead of your hands constantly repositioning across a large keyboard, they remain in a comfortable, neutral position, with layers bringing the functionality to your fingertips. This can be particularly beneficial in preventing or alleviating repetitive strain injuries, squeezing out the efficiency gains, streamlining repetitive tasks, and making your entire computing experience more fluid.

That said, I won't mince my words — initially, layer maps require conscious effort, but with practice, your fingers find the right keys without you having to think about it. For the first week of using a 40%, I printed out the keymap for each layer and placed it on my desk for quick access.

Not So Alien After All

After spending a couple of years using these weirdly tiny keyboards that seem to be missing too many keys and being grilled for choosing a weird way, I've come to understand it's just intimidating for most people. One day, my only serviceable 33% keyboard stopped working. I was forced to use a larger, conventional 75% layout, only to realize I had practically ignored the other extra keys now that I loved the efficiency in compactness. It helped that my backup keyboard was QMK-compatible, so I used the same layout as my 40%, but using it with default mappings seemed untenable. Now, I just wish more people tried compact keyboards, knowing what I know after two years of daily use.