WebcamMicTest
STREAM & ENCODING DIAGNOSTIC

Screen Share Test Online & Screen Mirroring Benchmark

Capture your display, window, or browser tab. Run a screen share test and screen mirroring test to benchmark live frame rates, measure latency jitter, and detect GPU encoding throttles.

Screen Share

Screen Share Stress Test

Benchmark 60 FPS video transmission, frame latency, and presentation clarity.

SCREEN CAPTURE ENGINE
Ready โ€” Start Screen Share to Benchmark Performance
Click "Start Screen Share" to capture your monitor, application window, or browser tab and detect rendering bottlenecks.
Live Screen Stream Viewport
๐Ÿ“บ

Screen Capture Stream Inactive

Click "Start Screen Share" above to begin capturing your display, application window, or browser tab.

Real-Time Frame Latency Jitter (ms per frame)
60 FPS (16.6ms) 30 FPS (33.3ms) Stutter (>40ms)
Jitter: ยฑ0.0 ms

๐Ÿ”ฅ Stress Pattern Generator (Bottleneck Inducer)

Select a pattern below to stress your GPU encoder and measure dynamic frame drops in real time.

Stress Engine Paused

Click "Run Stress Pattern" to animate high-intensity motion frames or pop it out into a separate window to share.

Motion Intensity / Speed:
Render Complexity: 500 High-Bitrate Nodes

Stream Telemetry LIVE WEBRTC METRICS

Real-Time FPS
0.0
Awaiting Stream
Resolution
0 ร— 0
Aspect Ratio --
Frame Jitter
ยฑ0.0 ms
VSync Pacing --
Dropped Frames
0
0.0% Stutter
Capture Source: None
System Audio: Inactive
Estimated Bitrate: 0.0 Mbps

Screen Share Score

GRADE --
-- / 100

Run the 10-second stress benchmark to calculate your screen share readiness score and pinpoint GPU or encoding bottlenecks.

Bottleneck Verdicts 0 DETECTED

No stream active. Start screen sharing or run the benchmark to diagnose bottlenecks.

Platform Readiness OPTIMIZATION GUIDE

๐Ÿ’ป
Zoom Workplace
1080p HD / 60 FPS Mode
Ready
๐Ÿ“น
Google Meet
5-15 FPS Text / 30 FPS Motion
Ready
๐Ÿ‘ฅ
Microsoft Teams
1080p30 Hardware Accelerated
Ready
๐ŸŽฎ
Discord Stream
720p30 / Nitro 1080p60
Ready
โšก

60 FPS Screen Share Test

Screen sharing high-motion slide decks, Figma prototypes, or games demands high framerates. Our live analyzer benchmarks actual display rendering up to 60 FPS.

๐Ÿ”

Screen Mirroring Test Clarity

Chroma subsampling (4:2:0 compression) can blur fine text in dark IDEs and code reviews. Test sharp readability with our fine-line visual target before presenting.

๐Ÿ”’

Zero-Server Client Privacy

Never share your confidential work computer screen through unknown cloud services. Our screen share test executes 100% locally via browser WebRTC getDisplayMedia.

SCREEN MIRRORING & 60 FPS STREAM GUIDE

Screen Share & Mirroring Performance Diagnostic Guide

Master video capture settings, benchmark frame rate stability, calibrate audio sync, and eliminate blurry text in conference calls.

๐Ÿ’ก Why Test Screen Sharing Before High-Stakes Presentations?

Presenting slide decks, financial dashboards, software prototypes, or product demos to clients over Zoom, Microsoft Teams, or Google Meet requires substantial graphic rendering power and bandwidth. Many users discover too late that their screen share is transmitting at a choppy 5 FPS, text is blurry due to 4:2:0 chroma compression, or embedded demo video audio is muted.

Running an online screen share test ahead of your meeting allows you to benchmark native 30 FPS vs 60 FPS delivery, inspect frame latency and jitter, test tab audio synchronization, and verify text clarity under live compression โ€” completely locally and with 100% privacy.

๐Ÿš€ How to Test Screen Sharing in 3 Simple Steps

Follow these quick steps to test your display capture, framerate, and audio streaming.

1

Select Capture Source

Click 'Start Screen Share' and choose between Entire Screen, Window, or Browser Tab.

2

Enable Audio Pass-Through

If testing embedded video, tick 'Share system audio' or 'Share tab audio' in the browser prompt.

3

Inspect Framerate & Sharpness

Check live FPS and latency metrics, and test fine-line text clarity using our diagnostic target.

๐Ÿ“Š

Screen Capture Modes & Technical Capabilities

Comparison of display resolution, framerate targets, and audio streaming capabilities across capture types.

Capture Mode Resolution Limit FPS Target Best Use Case & Notes
๐Ÿ”น Full Display Capture Up to 4K UHD 30 - 60 FPS Captures entire monitor surface including OS taskbars and notifications. Requires maximum upload bandwidth.
๐Ÿ”น Application Window Capture Target App Res 30 - 60 FPS Confines stream strictly to chosen app window for privacy. Audio sharing not supported by browser window capture.
๐Ÿ”น Browser Tab with Audio 1080p Full HD 60 FPS Fluid Provides crystal-clear tab audio pass-through. Best for streaming web video, demos, and presentations.
๐Ÿ”น Wireless Screen Mirroring 1080p HD 30 - 60 FPS AirPlay, Miracast, and Google Cast display projection over Wi-Fi. Prone to packet jitter without Wi-Fi 6.
๐Ÿ”ง

Screen Share Troubleshooting & Optimization

Practical steps to fix blurry text, missing audio, black screens, and framerate drops.

Blurry Code or Text in Dark Mode

Symptom: Viewers complain that fine code or spreadsheet numbers appear fuzzy and pixelated.
Solution: Video codecs compress dark high-frequency text heavily under 4:2:0 subsampling. Enlarge editor font size (Ctrl/Cmd + '+') and avoid selecting 'Optimize for video clip' for text documents.

No Sound When Sharing Embedded Video

Symptom: Meeting attendees see your video playing but cannot hear audio or dialogue.
Solution: Audio pass-through is only supported when selecting 'Browser Tab' or 'Entire Screen' with 'Share audio' checked. Ensure the tab volume is unmuted inside the browser.

Black Screen During Screen Share

Symptom: Shared stream renders as an empty black box or freezes on the first frame.
Solution: DRM-protected streaming services (Netflix, Apple TV) block capture. For non-DRM apps, toggle 'Use graphics acceleration' in browser settings or grant macOS Screen Recording permissions.

Heavy Lag and Choppy 5 FPS Playback

Symptom: Screen updates intermittently every few seconds with high cursor latency.
Solution: CPU software encoding is overloaded. In Chrome/Edge settings, enable GPU Hardware Acceleration and switch to a wired Ethernet connection to prevent Wi-Fi bufferbloat.

Help & FAQs

Screen Sharing Frequently Asked Questions

Answers to the most common questions about audio sharing, 60 FPS settings, blurry text fixes, and meeting privacy.

Q1 How to test screen sharing with system audio?
∨

To test screen sharing with audio, open our Screen Share Test Online and click Start Screen Share. When the browser permission dialog appears, choose either Chrome Tab or Entire Screen, and ensure the Share system audio / Share tab audio checkbox is enabled at the bottom left of the modal. The test canvas will verify whether audio tracks are actively broadcasting alongside video.

Q2 Why is my screen sharing blurry on Zoom or Google Meet?
∨

Blurry screen sharing usually stems from three causes:

  1. Dynamic Bitrate Downscaling: Video conference apps downgrade resolution from 1080p to 720p or 360p when internet bandwidth or packet loss occurs.
  2. Chroma Subsampling (4:2:0): Text on dark IDE backgrounds compresses poorly under aggressive video codecs.
  3. Display Scaling: High-DPI screens (e.g. 4K at 150% scaling) can introduce resampling softness when shared.

Use our fine-text sharpness test grid to verify your presentation readability before meetings.

Q3 How can I share my screen at 60 FPS instead of 30 FPS?
∨

Most meeting software defaults screen sharing to 5 to 15 FPS to conserve bandwidth for static documents. To share at 60 FPS (for video playback, game demos, or smooth animations): 1. In Zoom, go to Settings > Share Screen > Advanced and check Optimize for video clip. 2. Enable browser hardware acceleration in Chrome or Edge settings so GPU video encoders (NVENC/QuickSync) can handle 60 FPS encoding smoothly.

Q4 Can online exams and proctoring software detect screen sharing?
∨

Yes. Online exam proctoring systems (Respondus LockDown Browser, Proctorio, Honorlock, Examity) detect screen sharing via operating system process scanners, display count APIs, and WebRTC getDisplayMedia hooks. They flag active secondary monitors, virtual displays, HDMI splitters, and background streaming tools such as Discord, Zoom, or OBS Studio.

Q5 Why does screen sharing show a black screen in browser?
∨

A black screen during screen sharing typically occurs due to: 1. Hardware Acceleration conflict: Try toggling Hardware Acceleration in browser settings. 2. DRM Protected Content: Streaming apps (Netflix, Disney+) intentionally black out screens to prevent recording. 3. OS Permissions: On macOS, grant permissions in System Settings > Privacy & Security > Screen Recording.

Q6 Does screen sharing consume high CPU or GPU resources?
∨

Screen sharing captures 30 to 60 full-resolution frames per second and encodes them using H.264, VP9, or AV1 codecs. If Hardware Acceleration is active, your GPU's dedicated video encoder processes this with less than 5% CPU impact. If disabled, CPU software encoding can cause fan noise and performance drops.

Q7 Why does my 4K screen show 1920 ร— 1080?
∨

Because your operating system runs display scaling. At 200% scaling, Windows and macOS tell apps the screen is 1920 ร— 1080 so that text stays a comfortable size, while the panel still lights up its full 3840 ร— 2160. This page multiplies the reported size by your pixel density to recover the real number, so the headline figure should match the panel. If it does not, check for browser zoom โ€” it changes the numbers too.

Q8 Is my screen Full HD, QHD or 4K?
∨

Compare the headline figure with the common standards: 1280 ร— 720 is HD, 1920 ร— 1080 Full HD, 2560 ร— 1440 QHD, 3840 ร— 2160 4K UHD and 7680 ร— 4320 8K. Ultrawide monitors use their own set, such as 2560 ร— 1080 and 3440 ร— 1440. The aspect ratio shown under the headline tells you whether the panel is a regular 16:9, a productivity 16:10 or an ultrawide 21:9.

Q9 Why does the refresh rate show 60 Hz when my display is 120 Hz?
∨

Usually because something is deliberately holding it down. Phones drop to 60 Hz to save battery, laptops do the same on power-saver profiles, and on desktops the display settings may still be set to 60 Hz even though the panel can do more. The cable can also be the cap โ€” older HDMI versions cannot carry 4K above 60 Hz. Set the rate explicitly in your display settings, then verify with the refresh rate test.

Q10 Can the browser tell my monitor's brand and model?
∨

No. For privacy reasons the browser only exposes numbers โ€” size, density, color capabilities and refresh timing. It cannot read the monitor's model name, serial number or any other identifying details, and neither can this page. Anything that claims to name your exact monitor from inside a web page is guessing from those same numbers.

Q11 What does a pixel density of 1.25ร— or 1.5ร— mean?
∨

Pixel density is how many real pixels the screen uses for each dot of the picture. Whole numbers like 2ร— come from HiDPI and Retina displays. In-between values almost always mean Windows display scaling: 125% shows up as 1.25ร—, 150% as 1.5ร—. Browser zoom changes the value too, which is why it moves when you press Ctrl and + or โˆ’.

Q12 Why do the numbers change when I zoom the page?
∨

Browser zoom makes every dot of the page bigger or smaller, and the measurements on this page scale along with it. Zooming in makes the reported resolution drop and the pixel density rise, while the physical panel obviously never changes. For accurate readings reset zoom to 100% โ€” Ctrl+0 on Windows and Linux, Cmd+0 on a Mac.

Q13 How do I check my screen for dead pixels?
∨

Use the dead pixel check linked above. It fills the screen with solid red, green, blue, white and black, one after another, so a pixel that is stuck on one color or permanently dark stands out immediately. Clean the screen first โ€” a speck of dust is the most common false alarm โ€” and give each color a few seconds of close attention.

Q14 Is this screen test free and private?
∨

Yes to both. Every value on this page is read locally by your browser and never sent to a server โ€” there is nothing to install, no account, and no way for anyone to see your results. The page simply shows you what your own browser already knows about the display it is running on.

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