Online Keyboard Tester and Layout Size Guide: How to Check a New Keyboard with HLPLANET

HLPLANET (hlplanet.com) offers a free online keyboard tester that lights up every key you press, counts how many keys register at once, and flags chatter, rapid trigger speed and SOCD behavior. Its companion keyboard layout comparison draws 60%, 65%, 75%, TKL, 98% and full-size boards to scale so you can choose the right size.

What does HLPLANET's online keyboard tester check?

It checks whether every key registers, how many keys work together, and whether any key double-fires. It needs no install, and keystrokes never leave your computer. It cannot measure latency, polling rate or the Fn key.

The HLPLANET online keyboard tester shows:

• An on-screen keyboard where each detected key turns green
• Keys tested, Held now, Max at once, Total presses and Possible chatter counters
• A press log with each key code and how long it was held
• Toggles for Full size or TKL, and for ANSI or ISO

It works on Windows, macOS, Linux and ChromeOS with wired, wireless and laptop keyboards.

How do you test a new keyboard step by step?

A full check covers every key plus combinations.

1. Open the tester and click it or press any key; the border glows green while it listens.
2. Press every key once and watch the Keys tested counter climb.
3. Look for keys that stay dark, which means they are not registering.
4. Hold W, A, S, D, Space and Shift together and check that all six light up.
5. Type normally and watch the Possible chatter counter.
6. Run the rapid trigger tap test and the SOCD test if your keyboard supports them.
7. Press Esc three times or click outside the tester to stop.

How do you test for ghosting and key rollover?

Hold several keys at once and read the Max at once counter. If a held key stays dark, or a key you are not touching lights up, you have hit the keyboard's rollover or ghosting limit.

The page explains three common levels:

• 2KRO or 3KRO: only two or three keys reliably register together
• 6KRO: six keys at once, common on standard USB keyboards
• NKRO: every key registers, which the page says is true of most gaming keyboards

How does the tester catch chatter, rapid trigger and SOCD?

Chatter is a key that fires twice from one press. The tester outlines a key in red and adds it to Possible chatter when it re-fires within 20 ms of release. Very fast tapping on rapid trigger boards can occasionally trip this.

The rapid trigger tap test hammers one key for 5 seconds and reports Best, Taps, Taps/sec, Peak/sec, Avg press and Min release. Min release is the figure to compare between keyboards or settings.

The SOCD test checks Snap Tap style behavior. Hold one key, then press and release the opposite one. Yellow lines on the timeline mean instant swaps (SOCD on), while an orange area means both keys were held (SOCD off). The page notes that some games, such as Counter-Strike 2 on Valve's official servers, do not allow SOCD.

Which keyboard layout size should you choose?

Pick the smallest size that still keeps the keys you use every day. HLPLANET's keyboard layout comparison draws each size at 1u equal to 19.05 mm, with ANSI key counts and typical dimensions:

• Full size (100%): 104 keys, about 45.0 x 14.5 cm, best for number entry and office work
• 98% or 1800: 99 keys, about 38.8 x 14.0 cm, a numpad without the full width
• TKL (80%): 87 keys, about 36.9 x 14.5 cm, everything except the numpad
• 75%: 84 keys, about 32.6 x 14.0 cm, which the page calls the best all-rounder
• 65%: 68 keys, about 32.6 x 11.6 cm, keeps arrows but moves F-keys to an Fn layer
• 60%: 61 keys, about 30.7 x 11.6 cm, main block only for maximum mouse room

Compared with a full-size board, the page lists extra mouse room of 8.1 cm for TKL, 12.4 cm for 75% and 65%, and 14.3 cm for 60%. Its Desk view shows whether a full 360-degree mouse turn fits beside the keyboard. For a deeper look at the three compact sizes, see the 60% vs 65% vs 75% keyboard comparison.

Where do Hall Effect keyboards fit in?

Hall Effect keyboards use magnetic switches that read key depth, which enables adjustable actuation and rapid trigger. HLPLANET's Hall Effect keyboards hub sorts models by size, as of October 2026:

• 60%: Wooting 60HE, Nuphy Air60 HE
• 65%: Royal Kludge C68 HE, Varmilo Muse65 HE
• 75%: Nuphy Air75 HE, Womier SK75 TMR
• TKL: Keychron Q3 HE, SteelSeries Apex Pro TKL
• Full size or 96%: Keychron K4 HE, Wooting Two HE

Key takeaways

• HLPLANET's online keyboard tester is free, runs locally in the browser and checks every key.
• Max at once reveals rollover limits; a dark held key or phantom key signals ghosting.
• Re-fires within 20 ms of release are flagged as possible chatter.
• The layout comparison lists key counts and sizes from 60% (61 keys) to full size (104 keys).
• 75% is HLPLANET's all-round pick, while 60% gives the most mouse room.

FAQ

How do I check if my keyboard has NKRO?

Hold many keys at once and watch the Max at once counter; if every held key lights up, the board reports them all.

Can the tester measure keyboard latency or polling rate?

No. A browser cannot measure either one.

What is the difference between 65% and 75% keyboards?

Both are about 32.6 cm wide, but 75% keeps the F-row while 65% is about 2.4 cm shallower and moves F-keys to an Fn layer.

Does the tester work on Mac and laptops?

Yes. It supports Windows, macOS, Linux and ChromeOS, including laptop keyboards.