摄像头在线测试 — 免费摄像头画质与参数检测

Runs entirely in your browser
Camera is off. Press Start camera.

The mirror switch only flips this preview, like a mirror. It does not change the camera, the measurements, or (by default) saved snapshots.

What the camera is really delivering

FPS now

—

last 1 s

FPS average

—

last 10 s

Slowest frame

—

fps equivalent

Frame size

—

as delivered

Camera
—
Negotiated resolution
—
Negotiated frame rate
—
Facing mode
—
Max resolution (reported)
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Max frame rate (reported)
—

FPS is counted from frames the browser actually delivered (video frame callback). “Negotiated” values are what the browser agreed with the camera; “max” values are the limits it reports and are not available in every browser.

Lighting and exposure check

Start the camera to check lighting

Measured on a 64-bin histogram of a small downscaled copy of the frame, about twice a second, as 8-bit brightness. Too dark means average at or below 50; too bright at or above 190; clipped means 5% or more of pixels at 250+. Shaded zones on the histogram mark the dark and clipped ranges; the dashed line is the average. A flat black frame suggests a closed privacy shutter or a covered lens.

Resolution probe

Briefly pauses the preview, asks the camera for each size in turn, then restores it.
RequestedTierPixelsResult
640×480SD0.3 MPNot tested yet
1280×720HD0.9 MPNot tested yet
1920×1080Full HD2.1 MPNot tested yet
2560×1440QHD3.7 MPNot tested yet
3840×21604K8.3 MPNot tested yet

“Accepted” only means the browser agreed to the exact size you asked for. The browser or driver may still scale or crop the image in software, so this is an upper bound on what a web page can request, not a measurement of the sensor. Cameras that are busy or limited by USB bandwidth can be rejected at sizes they could otherwise handle.

Snapshot

Snapshots are saved as PNG at the full delivered frame size and are not mirrored by default, even when the preview is, so text in the picture reads correctly. The image stays in this tab's memory until you download it. For photo strips, see the Photo Booth tool.

Camera not working? Troubleshooting

Black picture: physical privacy shutter or camera-off key

Many laptops and external webcams have a small sliding shutter over the lens, and some keyboards have a function key that cuts power to the camera (often marked with a camera icon). If the lighting panel reports a black frame, open the shutter, remove any cover or tape, and press the key again.

Operating system camera privacy setting

Windows 10 and 11: Settings, Privacy & security, Camera, then turn on Camera access and allow desktop apps (browsers count as desktop apps). macOS: System Settings, Privacy & Security, Camera, and enable your browser. Android and iOS: allow the camera for your browser in the system settings. A browser blocked here will report that no camera could be opened or that permission was denied.

Another app is using the camera

Most cameras can serve only one app at a time. Quit video-call apps, recorders, virtual-camera or streaming software, and other browser tabs that use the camera, then press Start again. A browser error saying the camera could not be opened or is not readable usually means this.

Browser site permission

Chrome and Edge: click the camera or padlock icon in the address bar and set Camera to Allow, or open the site settings. Firefox: click the permissions icon in the address bar and clear the blocked camera entry. Safari: Safari menu, Settings, Websites, Camera, set this site to Allow. Reload the page after changing it. Camera access also needs a secure (https) page.

Camera is not listed or keeps disconnecting

Try another USB port (directly on the computer, not a hub), another cable, and check Device Manager (Windows) or System Information (macOS) to see whether the camera appears. If it disappears while testing, this page shows a disconnected message and you can press Start camera after reconnecting.

Everything on this page runs locally. Video is displayed in this tab and never recorded or uploaded. Numbers describe what this browser receives, which can differ from the camera's hardware specification.

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摄像头在线测试 — 免费摄像头画质与参数检测

点击“开始”即可显示你的摄像头画面。页面将呈现摄像头的实际输出表现:浏览器协商的分辨率与帧率、逐帧实测帧率、支持 640×480、720p、1080p、1440p 和 4K 中的哪些规格,以及画面是否过暗、过亮或因关闭隐私遮盖阀而导致纯黑。支持作为 Windows 11 摄像头检测、笔记本内置摄像头测试,以及 Mac、Chromebook、Android 或 iPhone 的摄像头测试,免安装且无需注册。视频画面绝不离开此标签页。

完全在你的浏览器中本地运行。视频画面仅在当前标签页的本地 <video> 元素中呈现并在 canvas 上进行采样分析;绝不上传任何单帧画面、截图或测试数据,也不发起任何网络请求。截图仅保存在内存中,直到你主动点击下载。

如何在线测试你的摄像头

  1. 启动摄像头. 点击“启动摄像头”,并在浏览器弹出权限提示时选择允许。如果你有多个摄像头,可从列表中切换选择;在手机上可点击“前后切换”。
  2. 检查实时画面. 观察画面预览。黑屏通常意味着物理防窥挡片未打开或镜头被遮挡;若画面完全漆黑,采光检测面板会给出相应提示。镜像开关仅翻转你看到的画面,不影响实际输入。
  3. 查看真实测试数据. 读数面板显示浏览器协商达成的分辨率和帧率,以及最近几秒内实测的帧率。如果实测 FPS 远低于协商值,说明摄像头存在掉帧,通常是光线不足或 USB 接口总线繁忙所致。
  4. 探测支持的分辨率. 点击“测试支持的分辨率”。页面会依次向摄像头请求各个分辨率规格,汇报浏览器成功接受的档位,随后恢复你的预览。你还可以保存截图以细致检查画质细节。

使用场景

在求职面试或视频会议前检查笔记本内置或外接摄像头是否正常工作
检测新买的摄像头是否真正在浏览器中输出 1080p 或 4K 画质
排查画面黑屏或卡顿原因:物理防窥挡片未开、权限被拒还是其他应用冲突占用
在直播或录制视频前检查光线充足度与背景逆光(例如身后明亮的窗户)情况
使用相同的测量基准对比手机前后摄像头,或两台外接 USB 摄像头的参数表现

常见问题

我的视频会被上传或录制吗?

不会。视频流仅在当前标签页的本地 video 元素中播放,采光检测也只是在 canvas 画布上读取经过缩小采样的单帧像素。没有上传、没有录制,也没有任何网络请求。截图数据仅暂存在内存中,直到你主动点击下载。

为什么页面显示分辨率是“已接受”而不是“支持”?

测试探测程序会向浏览器请求特定的尺寸规格,并记录该请求是否成功。“已接受”仅代表浏览器同意以该规格输出画面。浏览器和驱动程序仍可能通过软件方式进行缩放或裁剪,部分摄像头还会进行插值处理,因此“已接受”不能作为传感器硬件原生采集对应像素的绝对证明。当浏览器实际汇报的尺寸与请求不一致时,表格中会明确标出。

摄像头测试显示黑屏怎么办?

首先检查镜头上是否有物理防窥滑盖,或键盘上是否有摄像头硬件开关按键。接着检查操作系统中针对当前浏览器的摄像头隐私权限设置,并关闭可能正在占用摄像头的其他应用程序。如果采光面板提示“纯黑画面”,说明画面确实无光;如果提示采光正常,说明视频流已正常传输。本页面的故障排查指南列出了各类具体原因与解决办法。

如何在 Windows 11 或笔记本电脑上测试摄像头?

在 Chrome、Edge 或 Firefox 中打开此页面,点击“启动摄像头”并允许权限访问。若浏览器无法连接摄像头,请打开 Windows 设置,依次进入“隐私和安全性”>“相机”,确保开启应用及浏览器的相机访问权限。笔记本电脑通常还配有功能快捷键或物理滑动盖板,可能会断开摄像头连接。

为什么实测 FPS 低于摄像头宣称的标称帧率?

许多摄像头在光线较暗的环境下会自动降低帧率以延长单帧曝光时间,此外 USB 接口带宽限制、节能省电模式以及其他后台程序占用也会拉低帧率。本页面利用视频帧回调接口实测浏览器实际接收到的帧率,反映的是网页应用或视频通话时的真实表现,可能会低于产品规格表标注的理论值。不支持该回调的浏览器会回退为按显示器刷新率采样,此时汇报数值无法超过屏幕自身的刷新率。

我可以用它在 Mac、iPhone 或 Android 设备上测试摄像头吗?

可以。只要浏览器在安全页面 (HTTPS) 下支持调用摄像头即可使用。在移动手机上,“前后切换”可请求调用另一侧摄像头,并在设备无可用镜头时给出提示。部分浏览器暴露的摄像头参数特性少于 Chrome,因此“最大值”等字段可能会显示为未公开,但实时测量功能依然完全正常。

摄像头分辨率档位与采光检测指标说明

以下是分辨率探测程序请求的五种常见规格尺寸,每行对应行业常用的档位名称。采光检测基于 8 位亮度值(0 代表纯黑,255 代表纯白),在单帧缩小副本上采样测算。帧率基于最近 1 s(当前)和 10 s(平均)进行测定。

档位探测尺寸宽高比像素量典型用途
SD 标清640×4804:30.3 MP老款内置摄像头、低带宽视频通话
HD 高清1280×72016:90.9 MP常见笔记本电脑摄像头、标准视频通话
Full HD 全高清1920×108016:92.1 MP独立外接摄像头、游戏直播、视频录制
QHD 极清2560×144016:93.7 MP中高端外接摄像头、手机摄像头
4K3840×216016:98.3 MP4K 高端摄像头、手机相机、采集卡设备
  • 光线过暗:平均亮度在 50(以 255 为满值)或以下。光线过亮:平均亮度在 190 或以上。高光过曝裁切:有 5% 或更多的像素达到 250 或以上(呈现纯白,通常是由窗户或强光灯引起)。
  • 画面全黑或被遮挡:画面几乎没有明暗变化(亮度极差在 4 以下)且平均亮度在 12 或以下。此特征表明画面彻底处于漆黑状态(如关闭防窥挡片或镜头被物理覆盖),而不仅仅是环境光线昏暗。
  • 探测测试“已接受”代表浏览器同意了该特定约束请求。浏览器或系统驱动仍可能通过软件方式缩放或裁剪画面,因此请将最高接受规格视为网页应用所能请求的上限,而非传感器本身的物理硬件规格。