A good keyboard can last for decades, which is why buying used makes so much sense. It also means the board in the listing might have had a long, hard life before it got to you. Most problems show up in the photos, in a short typing video, or in a few minutes of testing when it arrives. This guide goes through what to check, in roughly the order we'd check it.
Pin down the exact model
Start with the model number, from the box or the label on the back. Many keyboards come in near-identical versions with different switches, layouts or connections. An HHKB with code 820 has a Japanese layout. A Leopold FC660C is Topre and an FC660M is Cherry MX. A Keychron Q1 Pro is Bluetooth and a Q1 Max adds 2.4 GHz. If the title leaves it vague, ask before you buy. Our catalog covers what to look for model by model.
Switches and hot-swap
Find out which switch is in it. The listing should name it, and a photo with one keycap pulled will confirm it. Cherry MX switches have the brand on the housing, and the stem color usually tells you the type, such as Red, Brown or Blue. Many brands make MX-style switches in the same colors, so a seller's MX Blue might be another maker's blue.
Then check whether the board is hot-swap or soldered. On a hot-swap board, the switches sit in sockets and pull straight out. Keychron's Q and V boards take three-pin and five-pin switches this way. A soldered board needs a soldering iron to replace a switch, so a bad switch is a bigger job. Topre boards are neither. Their domes come as sheets, and you can't fit MX switches at all. On a hot-swap board, ask whether the switches are the originals.
Firmware and programming
Check how the board is set up. QMK is open-source firmware, and boards that support VIA can be remapped live in the VIA app. Keychron's Q and V boards run QMK. HHKB and Leopold boards use DIP switches on the back, and newer HHKB and Realforce models have the maker's own software. Ask the seller to reset any remapping, or ask what's changed, so a strange key on arrival isn't a surprise.
Stabilizers
The long keys, like the space bar, Enter, Backspace and Shift, have stabilizers. These are wire bars that keep the key level wherever you press it. Ask for a short video of the seller pressing each long key at the ends and in the middle. It should sound the same everywhere, with no rattle, and come straight back up.
Chatter and dead keys
Chatter is when one press types a letter twice. Metal contacts in a switch always bounce a little, and the keyboard filters that out. A worn switch or a cracked solder joint can bounce for longer, and then you get doubled letters. A dead key is the opposite, with nothing at all.
To test, ask the seller to open keyboardtester.com or a similar key-test site and press every key once, on video. Each key should light up once. A typing video where you can read the screen works too. On a VIA board, VIA's own key tester does the same job. When it arrives, run the test yourself before the return window closes.
Keycaps
Keycaps tell you how hard a board has been used. ABS plastic is smooth and goes shiny with wear, especially on the space bar and home row. PBT has a matte, slightly textured feel and holds up better. ABS also yellows in sunlight and PBT doesn't, so a white ABS board that looks cream colored has seen some sun.
Then look at how the letters are made. Double-shot keycaps mould the legend from a second plastic, so it can never wear off. Dye-sublimated legends soak into the plastic and last too. Pad-printed legends are ink on the surface and do wear away. Laser-marked legends vary. Faded letters on the most-used keys often point to pad printing and a lot of typing.
Case and plate
Look at the case corners and edges in the photos for dents, cracks and deep scratches. Look at the screws on the bottom too. Chewed or missing screws can mean the board has been opened, so ask why. If the listing mentions mods like foam, lube or new stabilizers, ask what was done.
Layout
Most keyboards use one of three physical layouts. ANSI, the US layout, has a wide, flat Enter key. ISO, common in the UK and Europe, has a tall Enter key and a shorter left Shift with an extra key beside it. JIS, for Japanese, has a shorter space bar and Backspace and extra keys. The layout changes which keycap sets fit, so check the Enter key and space bar in the photos. HHKB boards also have their own arrangement, with Control where Caps Lock usually is.
Connection, battery and cable
Wired, Bluetooth and 2.4 GHz boards each need checking. On a board with a built-in battery, like a Keychron Pro or K series, ask how long a charge lasts now. Lithium-ion batteries lose capacity with age and charging. On a board that takes AA batteries, like a Hybrid HHKB, ask for a photo of the battery compartment. Leaking old batteries can corrode the contacts. Check the cable too. Older boards may use Mini-USB, while newer ones use USB-C. A missing cable is easy to replace if you know which one you need.
Topre domes
On an HHKB, Realforce or Leopold FC660C, every key should feel the same weight with a clean bump. Topre's rubber domes wear with heavy use, and a worn one feels mushier than its neighbors. Some Realforce boards are variably weighted on purpose, with lighter keys for the little fingers, so check which version it is before you call it uneven. Silenced boards like the HHKB Type-S should sound soft on every key.
Clones and copies
Group-buy keycap sets, GMK's especially, can resell for a lot. Cheaper sets imitate their colors and Cherry profile. If a listing claims a named group-buy set or a limited board, ask for the original packaging or proof of purchase and close-up photos. If the seller can't back it up, assume it's a look-alike.
When to walk away
Walk away from a soldered board with a chattering key unless you're happy to desolder. Pass on a listing whose seller won't show the switches, the long keys or a key test. Don't worry about a missing box, a little shine or a standard cable. Those are small things. Our methodology page explains how we pick listings, and each model page, like the Keychron Q1 or HHKB Classic, has a checklist for that board.
