Fast · Free · Private
Test Your Devices Online
Device Test Bench is a free browser diagnostics site for checking keyboards, mice, screens, webcams, microphones, speakers and game controllers without installing software.
- No installation
- No sign-up
- Private browser-based tests
- Desktop and mobile
Quick device check
Useful signals before a full test
No camera or microphone permission is requested here. Press a key and click or tap to confirm basic input locally.
Start here
Popular tests
Each tool explains what the browser can observe, what it cannot prove, and what to try when something looks wrong.
Keyboard Test
Press keys on a visual ANSI keyboard and inspect key, code, location, modifier and repeat state in real time.
Open test →MSMouse Test
Check five mouse buttons, pointer movement, drag, wheel direction, double click and pointer type inside one private test area.
Open test →MSDouble Click Test
Measure intervals between clicks and flag unusually short pairs that can resemble an unintended double click.
Open test →MSClick Speed Test
Measure clicks per second, click intervals and the fastest one-second segment in a distraction-free test pad.
Open test →CMWebcam Test
Start a private live preview only after clicking the button, then inspect the active stream and capture an optional in-memory snapshot.
Open test →CMMicrophone Test
Visualize microphone volume, waveform, frequency energy and clipping locally with the Web Audio API.
Open test →AUSpeaker Test
Play a short, low-volume tone through left, right or both channels after a deliberate click.
Open test →AUHeadphone Left Right Test
Play distinct channel tones to check headphone stereo direction without claiming to detect whether headphones are connected.
Open test →Browse by device
One bench for everyday checks
Keyboard & Typing
Check key events, rollover, repeat behavior and typing performance.
Mouse & Click
Check buttons, scrolling, click timing and browser pointer event frequency.
Camera & Microphone
Privately preview camera and microphone streams after you grant permission.
Speaker & Audio
Play controlled tones to check channels, balance and browser audio output.
Screen & Display
Inspect browser-reported display data, colors, pixels and animation timing.
Gamepad & Touch
Visualize controller buttons, axes, drift and touchscreen pointer input.
Device Information
Review browser-visible device capabilities without building a fingerprint.
Keyboard inputs, mouse movements, video and audio are processed locally in your browser and are not uploaded to our servers.
- Camera and microphone access starts only after you click a Start button.
- We do not save test results or build a device fingerprint.
- You can skip any permission and continue using other tests.
How it works
Useful evidence, honestly described
Your browser exposes an event or capability
Keyboard, pointer, media, screen and gamepad APIs provide the values shown in the test.
JavaScript turns it into a clear indicator
The interaction is processed on this page. Sensitive test data is not sent to an application endpoint.
You compare, repeat and troubleshoot
A browser observation helps narrow a problem, but it does not certify a component or perform a repair.
Reviewed publishing
Content built around the test, not around ad space
English pages are eligible for search only after their visible behavior, privacy boundary and limitations have been reviewed.
45 working tools with stated limits
Every tool names the browser signal it observes and the hardware claims it cannot make.
Read the testing methodology →50 symptom-focused troubleshooting guides
Each guide has its own procedure, interpretation table, cautions and reader questions instead of a title-swapped template.
Browse the guide library →Visible review and correction standards
Primary technical sources, review dates and a contact path make claims easier to verify and correct.
See the editorial policy →Troubleshooting library
Understand the result
How to Test Every Key on Your Keyboard
A repeatable way to check alphanumeric keys, modifiers, navigation keys and the number pad without losing track of what you have tested.
Keyboard & TypingWhy Is My Keyboard Key Not Working?
Work through focus, layout, accessibility, connection and debris checks before deciding a key switch has failed.
Keyboard & TypingWhat Is Keyboard Ghosting?
Understand why some multi-key combinations disappear and how a keyboard matrix differs from browser event handling.
Keyboard & TypingWhat Is N-Key Rollover?
A practical explanation of 2KRO, 6KRO and NKRO, including why the advertised value may depend on connection mode.
Keyboard & TypingHow to Fix Repeating Keyboard Keys
Separate normal operating-system key repeat from chatter, stuck switches and software remapping.
Keyboard & TypingWhy Does My Keyboard Type the Wrong Characters?
Identify language-layout mismatches, modifier states, Num Lock behavior and application-specific shortcuts.
Common questions
Before you start
Are these device tests free?
Yes. Core tests require no payment, download or account.
Is my keyboard input recorded?
No. Key events and typing passages remain on this page and are not sent to our server or analytics.
Is my webcam video uploaded?
No. The live stream is displayed locally after your permission and every track is stopped when the test ends.
Why does my browser ask for permission?
Browsers require a deliberate permission decision before a site can access a camera or microphone.
Can this site repair my device?
No. It provides browser observations and troubleshooting steps, not repair, warranty or professional certification.
Do these tests work on mobile devices?
Many do. Touch, media and screen behavior varies by mobile browser, so each tool detects support and explains limitations.