Question 1

Is this information sent to a server?

Accepted Answer

No. All information is read directly from browser APIs (navigator, screen, window) and displayed locally. Nothing is transmitted to any server. The page works offline once loaded.

Question 2

Why does the OS version sometimes appear incorrect?

Accepted Answer

OS version detection relies on parsing the user agent string, which browsers may not update accurately and which privacy-focused browsers may spoof. For accurate OS information, check your system settings.

Question 3

What is device pixel ratio?

Accepted Answer

Device pixel ratio (DPR) is the ratio of physical screen pixels to CSS pixels. A DPR of 2 means 4 physical pixels per CSS pixel — common on Retina displays. Higher DPR values produce sharper rendering but affect how images need to be sized.

Question 4

What is hardware concurrency?

Accepted Answer

Hardware concurrency (navigator.hardwareConcurrency) reports the number of logical CPU cores available. Web applications can use this to decide how many parallel Web Workers to spawn for CPU-intensive tasks.

Question 5

Can I use this to test if a user is on mobile?

Accepted Answer

Yes, Device Info shows the user agent string and touch support. For reliable mobile detection in production code, check for touch events and viewport width rather than relying solely on user agent parsing.

Question 6

Does it show GPU information?

Accepted Answer

Basic GPU information may be available via the WebGL renderer string (RENDERER). This tool focuses on the most practically useful device properties — GPU details are included where the browser exposes them.

Question 7

Why does the viewport size differ from the screen size?

Accepted Answer

Viewport is the visible area of the browser window (inside the browser chrome). Screen size is the total physical display resolution. These differ because the browser toolbar, taskbar, and other chrome take up space.

Question 8

Can this be used for browser fingerprinting?

Accepted Answer

The properties shown here are the same ones used in browser fingerprinting. This tool simply surfaces them for legitimate debugging purposes. Privacy-focused browsers intentionally reduce the uniqueness of these values.

设备信息

如何使用设备信息

关于设备信息

设备信息的主要功能

示例

常见使用场景

故障排除

常见问题

这些信息会被发送到服务器吗？

为什么操作系统版本有时显示不正确？

什么是设备像素比？

什么是硬件并发性？

可以用它来测试用户是否在移动设备上吗？

它显示 GPU 信息吗？

为什么视口大小与屏幕大小不同？

这可以用于浏览器指纹识别吗？